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.delete{color:#800} -.CodeRay .change .change{color:#66f} -.CodeRay .head .head{color:#f4f} -</style> -</head> -<body class="book toc2 toc-left"> -<div id="header"> -<h1>Control Query Default (CQD) Reference Guide</h1> -<div class="details"> -<span id="revnumber">version 2.3.0</span> -</div> -<div id="toc" class="toc2"> -<div id="toctitle">Table of Contents</div> -<ul class="sectlevel1"> -<li><a href="#_about_this_document">1. About This Document</a> -<ul class="sectlevel2"> -<li><a href="#_intended_audience">1.1. Intended Audience</a></li> -<li><a href="#_new_and_changed_information">1.2. New and Changed Information</a></li> -<li><a href="#_notation_conventions">1.3. Notation Conventions</a></li> -<li><a href="#_comments_encouraged">1.4. Comments Encouraged</a></li> -</ul> -</li> -<li><a href="#introduction">2. Introduction</a> -<ul class="sectlevel2"> -<li><a href="#introduction-cqd-descriptions">2.1. CQD Descriptions</a></li> -</ul> -</li> -<li><a href="#query-plans">3. Query Plans</a> -<ul class="sectlevel2"> -<li><a href="#default-degree-of-parallelism">3.1. DEFAULT_DEGREE_OF_PARALLELISM</a></li> -<li><a href="#hash-joins">3.2. HASH_JOINS</a></li> -<li><a href="#hbase-coprocessors">3.3. HBASE_COPROCESSORS</a></li> -<li><a href="#hive-num-esps-per-datanode">3.4. HIVE_NUM_ESPS_PER_DATANODE</a></li> -<li><a href="#join-order-by-user">3.5. JOIN_ORDER_BY_USER</a></li> -<li><a href="#mc-skew-sensitivity-threshold">3.6. MC_SKEW_SENSITIVITY_THRESHOLD</a></li> -<li><a href="#mdam-no-stats-positions-threshold">3.7. MDAM_NO_STATS_POSITIONS_THRESHOLD</a></li> -<li><a href="#mdam-scan-method">3.8. MDAM_SCAN_METHOD</a></li> -<li><a href="#merge-joins">3.9. MERGE_JOINS</a></li> -<li><a href="#nested-joins">3.10. NESTED_JOINS</a></li> -<li><a href="#optimization-level">3.11. OPTIMIZATION_LEVEL</a></li> -<li><a href="#parallel-num-esps">3.12. PARALLEL_NUM_ESPS</a></li> -<li><a href="#risk-premium-nj">3.13. RISK_PREMIUM_NJ</a></li> -<li><a href="#risk-premium-serial">3.14. RISK_PREMIUM_SERIAL</a></li> -<li><a href="#risk-premium-serial-scaleback-maxcard-threshold">3.15. RISK_PREMIUM_SERIAL_SCALEBACK_MAXCARD_THRESHOLD</a></li> -<li><a href="#robust-query-optimization">3.16. ROBUST_QUERY_OPTIMIZATION</a></li> -<li><a href="#skew-explain">3.17. SKEW_EXPLAIN</a></li> -<li><a href="#skew-rowcount-threshold">3.18. SKEW_ROWCOUNT_THRESHOLD</a></li> -<li><a href="#skew-sensitivity-threshold">3.19. SKEW_SENSITIVITY_THRESHOLD</a></li> -<li><a href="#subquery_unnesting">3.20. SUBQUERY_UNNESTING</a></li> -<li><a href="#traf-allow-esp-colocation">3.21. TRAF_ALLOW_ESP_COLOCATION</a></li> -<li><a href="#traf-upsert-with-insert-default-semantics">3.22. TRAF_UPSERT_WITH_INSERT_DEFAULT_SEMANTICS</a></li> -<li><a href="#upd-ordered">3.23. UPD_ORDERED</a></li> -</ul> -</li> -<li><a href="#query-execution">4. Query Execution</a> -<ul class="sectlevel2"> -<li><a href="#hbase-async-operation">4.1. HBASE_ASYNC_OPERATION</a></li> -<li><a href="#hbase-cache-blocks">4.2. HBASE_CACHE_BLOCKS</a></li> -<li><a href="#hbase-filter-preds">4.3. HBASE_FILTER_PREDS</a></li> -<li><a href="#hbase-hash2-partitioning">4.4. HBASE_HASH2_PARTITIONING</a></li> -<li><a href="#hbase_num_cache_rows_max">4.5. HBASE_NUM_CACHE_ROWS_MAX</a></li> -<li><a href="#hbase-rowset-vsbb-opt">4.6. HBASE_ROWSET_VSBB_OPT</a></li> -<li><a href="#hbase-rowset-vsbb-size">4.7. HBASE_ROWSET_VSBB_SIZE</a></li> -<li><a href="#hbase-small-scanner">4.8. HBASE_SMALL_SCANNER</a></li> -<li><a href="#scratch-dirs">4.9. SCRATCH_DIRS</a></li> -</ul> -</li> -<li><a href="#manage-histograms">5. Manage Histograms</a> -<ul class="sectlevel2"> -<li><a href="#cache-histograms-refresh-interval">5.1. CACHE_HISTOGRAMS_REFRESH_INTERVAL</a></li> -<li><a href="#hist-missing-stats-warning-level">5.2. HIST_MISSING_STATS_WARNING_LEVEL</a></li> -<li><a href="#hist-no-stats-refresh-interval">5.3. HIST_NO_STATS_REFRESH_INTERVAL</a></li> -<li><a href="#hist-prefetch">5.4. HIST_PREFETCH</a></li> -<li><a href="#hist-rowcount-requiring-stats">5.5. HIST_ROWCOUNT_REQUIRING_STATS</a></li> -<li><a href="#hist-use-sample-for-cardinality-estimation">5.6. HIST_USE_SAMPLE_FOR_CARDINALITY_ESTIMATION</a></li> -</ul> -</li> -<li><a href="#transaction-control-and-locking">6. Transaction Control and Locking</a> -<ul class="sectlevel2"> -<li><a href="#isolation-level">6.1. ISOLATION_LEVEL</a></li> -<li><a href="#isolation-level-for-updates">6.2. ISOLATION_LEVEL_FOR_UPDATES</a></li> -</ul> -</li> -<li><a href="#runtime-controls">7. Runtime Controls</a> -<ul class="sectlevel2"> -<li><a href="#last0-mode">7.1. LAST0_MODE</a></li> -<li><a href="#query-limit-sql-process-cpu">7.2. QUERY_LIMIT_SQL_PROCESS_CPU</a></li> -</ul> -</li> -<li><a href="#schema-controls">8. Schema Controls</a> -<ul class="sectlevel2"> -<li><a href="#catalog">8.1. Catalog</a></li> -<li><a href="#schema">8.2. Schema</a></li> -</ul> -</li> -<li><a href="#table_definition">9. Table Definition</a> -<ul class="sectlevel2"> -<li><a href="#auto-query-retry-warnings">9.1. ALLOW_NULLABLE_UNIQUE_KEY_CONSTRAINT</a></li> -<li><a href="#hbase-block-size">9.2. HBASE_BLOCK_SIZE</a></li> -<li><a href="#hive-default-charset">9.3. HIVE_DEFAULT_CHARSET</a></li> -<li><a href="#hive-file-charset">9.4. HIVE_FILE_CHARSET</a></li> -<li><a href="#hive-max-string-length">9.5. HIVE_MAX_STRING_LENGTH</a></li> -</ul> -</li> -<li><a href="#update-statistics-and-reorg">10. Update Statistics and Reorg</a> -<ul class="sectlevel2"> -<li><a href="#ustat-max-read-age-in-min">10.1. USTAT_MAX_READ_AGE_IN_MIN</a></li> -<li><a href="#ustat-min-rowcount-for-sample">10.2. USTAT_MIN_ROWCOUNT_FOR_SAMPLE</a></li> -<li><a href="#ustat-min-rowcount-for-low-sample">10.3. USTAT_MIN_ROWCOUNT_FOR_LOW_SAMPLE</a></li> -</ul> -</li> -<li><a href="#operational-controls">11. Operational Controls</a> -<ul class="sectlevel2"> -<li><a href="#auto-query-retry-warnings">11.1. AUTO_QUERY_RETRY_WARNINGS</a></li> -<li><a href="#explain-description-column-size">11.2. EXPLAIN_DESCRIPTION_COLUMN_SIZE</a></li> -<li><a href="#hbase-region-server-max-heap-size">11.3. HBASE_REGION_SERVER_MAX_HEAP_SIZE</a></li> -<li><a href="#hive-metadata-refresh-interval">11.4. HIVE_METADATA_REFRESH_INTERVAL</a></li> -<li><a href="#query-cache">11.5. QUERY_CACHE</a></li> -<li><a href="#traf-load-allow-risky-index-maintenance">11.6. TRAF_LOAD_ALLOW_RISKY_INDEX_MAINTENANCE</a></li> -<li><a href="#traf-load-flush-size-in-kb">11.7. TRAF_LOAD_FLUSH_SIZE_IN_KB</a></li> -</ul> -</li> -<li><a href="#debugging">12. Debugging</a> -<ul class="sectlevel2"> -<li><a href="#udr-debug-flags">12.1. UDR_DEBUG_FLAGS</a></li> -<li><a href="#udr_jvm_debug_port">12.2. UDR_JVM_DEBUG_PORT</a></li> -<li><a href="#udr-jvm-debug-timeout">12.3. UDR_JVM_DEBUG_TIMEOUT</a></li> -</ul> -</li> -</ul> -</div> -</div> -<div id="content"> -<div id="preamble"> -<div class="sectionbody"> -<div class="paragraph"> -<p><strong>License Statement</strong></p> -</div> -<div class="paragraph"> -<p>Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements. See the NOTICE file -distributed with this work for additional information regarding copyright ownership. The ASF licenses this file -to you under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with -the License. You may obtain a copy of the License at <a href="http://www.apache.org/licenses/LICENSE-2.0"; class="bare">http://www.apache.org/licenses/LICENSE-2.0</a></p> -</div> -<div class="paragraph"> -<p>Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an -"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the -specific language governing permissions and limitations under the License.</p> -</div> -<div style="page-break-after: always;"></div> -<div class="paragraph"> -<p><strong>Revision History</strong></p> -</div> -<table class="tableblock frame-all grid-all spread"> -<colgroup> -<col style="width: 50%;"> -<col style="width: 50%;"> -</colgroup> -<thead> -<tr> -<th class="tableblock halign-left valign-top">Version</th> -<th class="tableblock halign-left valign-top">Date</th> -</tr> -</thead> -<tbody> -<tr> -<td class="tableblock halign-left valign-top"><p class="tableblock">2.2.0</p></td> -<td class="tableblock halign-left valign-top"><p class="tableblock">TBD</p></td> -</tr> -<tr> -<td class="tableblock halign-left valign-top"><p class="tableblock">2.1.0</p></td> -<td class="tableblock halign-left valign-top"><p class="tableblock">May 1, 2017</p></td> -</tr> -<tr> -<td class="tableblock halign-left valign-top"><p class="tableblock">2.0.1</p></td> -<td class="tableblock halign-left valign-top"><p class="tableblock">July 7, 2016</p></td> -</tr> -<tr> -<td class="tableblock halign-left valign-top"><p class="tableblock">2.0.0</p></td> -<td class="tableblock halign-left valign-top"><p class="tableblock">June 6, 2016</p></td> -</tr> -<tr> -<td class="tableblock halign-left valign-top"><p class="tableblock">1.3.0</p></td> -<td class="tableblock halign-left valign-top"><p class="tableblock">January, 2016</p></td> -</tr> -</tbody> -</table> -</div> -</div> -<div class="sect1"> -<h2 id="_about_this_document">1. About This Document</h2> -<div class="sectionbody"> -<div class="paragraph"> -<p>This guide describes Trafodion Control Query Defaults (CQDs) that are used to override -system-level default settings.</p> -</div> -<div class="sect2"> -<h3 id="_intended_audience">1.1. Intended Audience</h3> -<div class="paragraph"> -<p>This guide is intended for database administrators and application programmers who want to -use CQDs to override system-default settings when querying a Trafodion database.</p> -</div> -</div> -<div class="sect2"> -<h3 id="_new_and_changed_information">1.2. New and Changed Information</h3> -<div class="paragraph"> -<p>This is a new guide.</p> -</div> -</div> -<div class="sect2"> -<h3 id="_notation_conventions">1.3. Notation Conventions</h3> -<div class="paragraph"> -<p>This list summarizes the notation conventions for syntax presentation in this manual.</p> -</div> -<div class="ulist"> -<ul> -<li> -<p>UPPERCASE LETTERS</p> -<div class="paragraph"> -<p>Uppercase letters indicate keywords and reserved words. Type these items exactly as shown. Items not enclosed in brackets are required.</p> -</div> -<div class="listingblock"> -<div class="content"> -<pre class="CodeRay highlight"><code data-lang="text">SELECT</code></pre> -</div> -</div> -</li> -<li> -<p>lowercase letters</p> -<div class="paragraph"> -<p>Lowercase letters, regardless of font, indicate variable items that you supply. Items not enclosed in brackets are required.</p> -</div> -<div class="listingblock"> -<div class="content"> -<pre class="CodeRay highlight"><code data-lang="text">file-name</code></pre> -</div> -</div> -</li> -<li> -<p>[ ] Brackets</p> -<div class="paragraph"> -<p>Brackets enclose optional syntax items.</p> -</div> -<div class="listingblock"> -<div class="content"> -<pre class="CodeRay highlight"><code data-lang="text">DATETIME [start-field TO] end-field</code></pre> -</div> -</div> -<div class="paragraph"> -<p>A group of items enclosed in brackets is a list from which you can choose one item or none.</p> -</div> -<div class="paragraph"> -<p>The items in the list can be arranged either vertically, with aligned brackets on each side of the list, or horizontally, enclosed in a pair of brackets and separated by vertical lines.</p> -</div> -<div class="paragraph"> -<p>For example:</p> -</div> -<div class="listingblock"> -<div class="content"> -<pre class="CodeRay highlight"><code data-lang="text">DROP SCHEMA schema [CASCADE] -DROP SCHEMA schema [ CASCADE | RESTRICT ]</code></pre> -</div> -</div> -</li> -<li> -<p>{ } Braces</p> -<div class="paragraph"> -<p>Braces enclose required syntax items.</p> -</div> -<div class="listingblock"> -<div class="content"> -<pre class="CodeRay highlight"><code data-lang="text">FROM { grantee [, grantee ] ... }</code></pre> -</div> -</div> -<div class="paragraph"> -<p>A group of items enclosed in braces is a list from which you are required to choose one item.</p> -</div> -<div class="paragraph"> -<p>The items in the list can be arranged either vertically, with aligned braces on each side of the list, or horizontally, enclosed in a pair of braces and separated by vertical lines.</p> -</div> -<div class="paragraph"> -<p>For example:</p> -</div> -<div class="listingblock"> -<div class="content"> -<pre class="CodeRay highlight"><code data-lang="text">INTERVAL { start-field TO end-field } -{ single-field } -INTERVAL { start-field TO end-field | single-field }</code></pre> -</div> -</div> -</li> -<li> -<p>| Vertical Line</p> -<div class="paragraph"> -<p>A vertical line separates alternatives in a horizontal list that is enclosed in brackets or braces.</p> -</div> -<div class="listingblock"> -<div class="content"> -<pre class="CodeRay highlight"><code data-lang="text">{expression | NULL}</code></pre> -</div> -</div> -</li> -<li> -<p>… Ellipsis</p> -<div class="paragraph"> -<p>An ellipsis immediately following a pair of brackets or braces indicates that you can repeat the enclosed sequence of syntax items any number of times.</p> -</div> -<div class="listingblock"> -<div class="content"> -<pre class="CodeRay highlight"><code data-lang="text">ATTRIBUTE[S] attribute [, attribute] ... -{, sql-expression } ...</code></pre> -</div> -</div> -<div class="paragraph"> -<p>An ellipsis immediately following a single syntax item indicates that you can repeat that syntax item any number of times.</p> -</div> -<div class="paragraph"> -<p>For example:</p> -</div> -<div class="listingblock"> -<div class="content"> -<pre class="CodeRay highlight"><code data-lang="text">expression-n ...</code></pre> -</div> -</div> -</li> -<li> -<p>Punctuation</p> -<div class="paragraph"> -<p>Parentheses, commas, semicolons, and other symbols not previously described must be typed as shown.</p> -</div> -<div class="listingblock"> -<div class="content"> -<pre class="CodeRay highlight"><code data-lang="text">DAY (datetime-expression) -@script-file</code></pre> -</div> -</div> -<div class="paragraph"> -<p>Quotation marks around a symbol such as a bracket or brace indicate the symbol is a required character that you must type as shown.</p> -</div> -<div class="paragraph"> -<p>For example:</p> -</div> -<div class="listingblock"> -<div class="content"> -<pre class="CodeRay highlight"><code data-lang="text">"{" module-name [, module-name] ... "}"</code></pre> -</div> -</div> -</li> -<li> -<p>Item Spacing</p> -<div class="paragraph"> -<p>Spaces shown between items are required unless one of the items is a punctuation symbol such as a parenthesis or a comma.</p> -</div> -<div class="listingblock"> -<div class="content"> -<pre class="CodeRay highlight"><code data-lang="text">DAY (datetime-expression) DAY(datetime-expression)</code></pre> -</div> -</div> -<div class="paragraph"> -<p>If there is no space between two items, spaces are not permitted. In this example, no spaces are permitted between the period and any other items:</p> -</div> -<div class="listingblock"> -<div class="content"> -<pre class="CodeRay highlight"><code data-lang="text">myfile.sh</code></pre> -</div> -</div> -</li> -<li> -<p>Line Spacing</p> -<div class="paragraph"> -<p>If the syntax of a command is too long to fit on a single line, each continuation line is indented three spaces and is separated from the preceding line by a blank line.</p> -</div> -<div class="paragraph"> -<p>This spacing distinguishes items in a continuation line from items in a vertical list of selections.</p> -</div> -<div class="listingblock"> -<div class="content"> -<pre class="CodeRay highlight"><code data-lang="text">match-value [NOT] LIKE _pattern - [ESCAPE esc-char-expression]</code></pre> -</div> -</div> -</li> -</ul> -</div> -</div> -<div class="sect2"> -<h3 id="_comments_encouraged">1.4. Comments Encouraged</h3> -<div class="paragraph"> -<p>We encourage your comments concerning this document. We are committed to providing documentation that meets your -needs. Send any errors found, suggestions for improvement, or compliments to <a href="mailto:[email protected]";>[email protected]</a>.</p> -</div> -<div class="paragraph"> -<p>Include the document title and any comment, error found, or suggestion for improvement you have concerning this document.</p> -</div> -</div> -</div> -</div> -<div class="sect1"> -<h2 id="introduction">2. Introduction</h2> -<div class="sectionbody"> -<div class="paragraph"> -<p>Refer to the -<a href="http://trafodion.apache.org/docs/sql_reference/index.html#control_query_cancel_statement";>Trafodion SQL Reference Manual</a> -full documentation of the CQD (CONTROL QUERY DEFAULT) statement.</p> -</div> -<div class="paragraph"> -<p>The CONTROL QUERY DEFAULT statement changes the default settings for the current process. You can execute -the CONTROL QUERY DEFAULT statement in a client-based tool like TrafCI or through any ODBC or JDBC application.</p> -</div> -<div class="paragraph"> -<p><strong>Syntax</strong></p> -</div> -<div class="listingblock"> -<div class="content"> -<pre class="CodeRay highlight"><code data-lang="text">{ CONTROL QUERY DEFAULT | CQD } control-default-option - -control-default-option is: - attribute {'attr-value' | RESET}</code></pre> -</div> -</div> -<div class="paragraph"> -<p>The result of the execution of a CONTROL QUERY DEFAULT statement stays in effect until the current process -terminates or until the execution of another statement for the same attribute overrides it. -CQDs are applied at compile time, so CQDs do not affect any statements that are already prepared. For example:</p> -</div> -<div class="listingblock"> -<div class="content"> -<pre class="CodeRay highlight"><code data-lang="text">PREPARE x FROM SELECT * FROM t; -CONTROL QUERY DEFAULT SCHEMA 'myschema'; -EXECUTE x; -- uses the default schema SEABASE -SELECT * FROM t2; -- uses MYSCHEMA; -PREPARE y FROM SELECT * FROM t3; -CONTROL QUERY DEFAULT SCHEMA 'seabase'; -EXECUTE y; -- uses MYSCHEMA;</code></pre> -</div> -</div> -<div class="paragraph"> -<p><strong>Examples</strong></p> -</div> -<div class="ulist"> -<ul> -<li> -<p>Change the maximum supported length of the column names to 200 for the current process:</p> -<div class="listingblock"> -<div class="content"> -<pre class="CodeRay highlight"><code data-lang="text">CONTROL QUERY DEFAULT HBASE_MAX_COLUMN_NAME_LENGTH '200';</code></pre> -</div> -</div> -</li> -<li> -<p>Reset the HBASE_MAX_COLUMN_NAME_LENGTH attribute to its initial value in the current process:</p> -<div class="listingblock"> -<div class="content"> -<pre class="CodeRay highlight"><code data-lang="text">CONTROL QUERY DEFAULT HBASE_MAX_COLUMN_NAME_LENGTH RESET;</code></pre> -</div> -</div> -</li> -</ul> -</div> -<div style="page-break-after: always;"></div> -<div class="sect2"> -<h3 id="introduction-cqd-descriptions">2.1. CQD Descriptions</h3> -<div class="paragraph"> -<p>The following information is provided for each CQD:</p> -</div> -<table class="tableblock frame-all grid-all spread"> -<colgroup> -<col style="width: 25%;"> -<col style="width: 75%;"> -</colgroup> -<tbody> -<tr> -<th class="tableblock halign-left valign-top"><p class="tableblock"><strong>Description</strong></p></th> -<td class="tableblock halign-left valign-top"><p class="tableblock">Describes the purpose of the CQD.</p></td> -</tr> -<tr> -<th class="tableblock halign-left valign-top"><p class="tableblock"><strong>Values</strong></p></th> -<td class="tableblock halign-left valign-top"><p class="tableblock">Identifies this information:<br> -<br> -• Values, in the form of a character string, that specify the applicable attribute values for the CQD.<br> -• The default attribute value.<br> -• If applicable, the Trafodion release in which the attribute values or default changed.</p></td> -</tr> -<tr> -<th class="tableblock halign-left valign-top"><p class="tableblock"><strong>Usage</strong></p></th> -<td class="tableblock halign-left valign-top"><p class="tableblock">Describes the conditions when the CQD is helpful, and how to detect the conditions.</p></td> -</tr> -<tr> -<th class="tableblock halign-left valign-top"><p class="tableblock"><strong>Production Usage</strong></p></th> -<td class="tableblock halign-left valign-top"><p class="tableblock">Identifies when the CQD is not safe to be used as a permanent setting in production.</p></td> -</tr> -<tr> -<th class="tableblock halign-left valign-top"><p class="tableblock"><strong>Impact</strong></p></th> -<td class="tableblock halign-left valign-top"><p class="tableblock">Describes any positive and negative implications of using the CQD.</p></td> -</tr> -<tr> -<th class="tableblock halign-left valign-top"><p class="tableblock"><strong>Level</strong></p></th> -<td class="tableblock halign-left valign-top"><p class="tableblock">Indicates one of these levels at which the CQD should be used:<br> -<br> -• Query<br> -• Session<br> -• Service<br> -• Any<br> -<br> -NOTE: This level indicates that the CQD can be used at the Query, Session or Service level as long as you fully understands the scope of the impact of the CQD.</p></td> -</tr> -<tr> -<th class="tableblock halign-left valign-top"><p class="tableblock"><strong>Conflicts/Synergies</strong></p></th> -<td class="tableblock halign-left valign-top"><p class="tableblock">Describes CQDs that are in conflict with or can be used in conjunction with the CQD.</p></td> -</tr> -<tr> -<th class="tableblock halign-left valign-top"><p class="tableblock"><strong>Real Problem Addressed</strong></p></th> -<td class="tableblock halign-left valign-top"><p class="tableblock">Describes any design or solution that the CQD may be a workaround for and how you can directly address the real problem.</p></td> -</tr> -<tr> -<th class="tableblock halign-left valign-top"><p class="tableblock"><strong>Introduced In Release</strong></p></th> -<td class="tableblock halign-left valign-top"><p class="tableblock">Indicates the Trafodion release when the CQD was introduced.</p></td> -</tr> -<tr> -<th class="tableblock halign-left valign-top"><p class="tableblock"><strong>Deprecated In Release</strong></p></th> -<td class="tableblock halign-left valign-top"><p class="tableblock">Indicates in what release the CQD was deprecated.</p></td> -</tr> -</tbody> -</table> -</div> -</div> -</div> -<div class="sect1"> -<h2 id="query-plans">3. Query Plans</h2> -<div class="sectionbody"> -<div class="paragraph"> -<p>This section describes CQDs that are used to influence query plans.</p> -</div> -<div class="sect2"> -<h3 id="default-degree-of-parallelism">3.1. DEFAULT_DEGREE_OF_PARALLELISM</h3> -<table class="tableblock frame-all grid-all spread"> -<colgroup> -<col style="width: 25%;"> -<col style="width: 75%;"> -</colgroup> -<tbody> -<tr> -<th class="tableblock halign-left valign-top"><p class="tableblock"><strong>Description</strong></p></th> -<td class="tableblock halign-left valign-top"><p class="tableblock">Defines the minimum size of the adaptive segment; that is, the number of processors -available for query operator parallelism. The optimizer may choose an adaptive-segment size that is equal to, or the multiple of, -the value of this CQD depending on the maximum estimated resource consumed by any single operator in the query. -The optimizer may also decide to run the query with no parallelism if the resource consumption estimate is very low.</p></td> -</tr> -<tr> -<th class="tableblock halign-left valign-top"><p class="tableblock"><strong>Values</strong></p></th> -<td class="tableblock halign-left valign-top"><p class="tableblock">Unsigned Integer.<br> -<br> -The default value is <strong>'16'</strong>.</p></td> -</tr> -<tr> -<th class="tableblock halign-left valign-top"><p class="tableblock"><strong>Usage</strong></p></th> -<td class="tableblock halign-left valign-top"><p class="tableblock">For systems running at higher levels of concurrency with workloads that include a large -number of small queries, reducing the default degree of parallelism may help achieve higher throughput.<br> -<br> -With the default of 16, for 32-node systems, adaptive segmentation can use two 16-node virtual segments to execute queries that -do not require a degree of parallelism of 32. This default setting can, for example, be changed to 8 for a 16-node system, -to allow adaptive segmentation to leverage a lower degree of parallelism.</p></td> -</tr> -<tr> -<th class="tableblock halign-left valign-top"><p class="tableblock"><strong>Production Usage</strong></p></th> -<td class="tableblock halign-left valign-top"><p class="tableblock">Not applicable.</p></td> -</tr> -<tr> -<th class="tableblock halign-left valign-top"><p class="tableblock"><strong>Impact</strong></p></th> -<td class="tableblock halign-left valign-top"><p class="tableblock">Lowering the value of this CQD can increase the throughput of -high-concurrency small-query workloads, but has the potential disadvantage of increasing the -elapsed time for some of the longer running queries that leverage adaptive segmentation.</p></td> -</tr> -<tr> -<th class="tableblock halign-left valign-top"><p class="tableblock"><strong>Level</strong></p></th> -<td class="tableblock halign-left valign-top"><p class="tableblock">System. There may be scenarios where you want to influence the degree of adaptive segmentation -parallelism only for a certain set of queries and use it at the service level.</p></td> -</tr> -<tr> -<th class="tableblock halign-left valign-top"><p class="tableblock"><strong>Conflicts/Synergies</strong></p></th> -<td class="tableblock halign-left valign-top"><p class="tableblock">Not applicable.</p></td> -</tr> -<tr> -<th class="tableblock halign-left valign-top"><p class="tableblock"><strong>Real Problem Addressed</strong></p></th> -<td class="tableblock halign-left valign-top"><p class="tableblock">Not applicable.</p></td> -</tr> -<tr> -<th class="tableblock halign-left valign-top"><p class="tableblock"><strong>Introduced In Release</strong></p></th> -<td class="tableblock halign-left valign-top"><p class="tableblock">Trafodion 1.3.0.</p></td> -</tr> -<tr> -<th class="tableblock halign-left valign-top"><p class="tableblock"><strong>Deprecated In Release</strong></p></th> -<td class="tableblock halign-left valign-top"><p class="tableblock">Not applicable.</p></td> -</tr> -</tbody> -</table> -<div style="page-break-after: always;"></div> -</div> -<div class="sect2"> -<h3 id="hash-joins">3.2. HASH_JOINS</h3> -<table class="tableblock frame-all grid-all spread"> -<colgroup> -<col style="width: 25%;"> -<col style="width: 75%;"> -</colgroup> -<tbody> -<tr> -<th class="tableblock halign-left valign-top"><p class="tableblock"><strong>Description</strong></p></th> -<td class="tableblock halign-left valign-top"><p class="tableblock">Determines whether the Trafodion Optimizer considers Hash Join when generating an execution plan.</p></td> -</tr> -<tr> -<th class="tableblock halign-left valign-top"><p class="tableblock"><strong>Values</strong></p></th> -<td class="tableblock halign-left valign-top"><p class="tableblock"><strong>'ON'</strong> Hash Join is considered.<br> -<strong>'OFF'</strong> Hash Join is not considered.<br> -<br> -The default value is <strong>'ON'</strong>.</p></td> -</tr> -<tr> -<th class="tableblock halign-left valign-top"><p class="tableblock"><strong>Usage</strong></p></th> -<td class="tableblock halign-left valign-top"><p class="tableblock">Use this CQD when you want to force the optimizer to generate a query plan that does not use any Hash Joins.</p></td> -</tr> -<tr> -<th class="tableblock halign-left valign-top"><p class="tableblock"><strong>Production Usage</strong></p></th> -<td class="tableblock halign-left valign-top"><p class="tableblock">Hash Join is an important join implementation strategy for most complex queries. -It is highly recommended that you do not turn HASH_JOINS OFF; that is, this CQD should be used to force a query plan for a particular query on an exception basis only.</p></td> -</tr> -<tr> -<th class="tableblock halign-left valign-top"><p class="tableblock"><strong>Impact</strong></p></th> -<td class="tableblock halign-left valign-top"><p class="tableblock">Turning HASH_JOINS OFF may result in very inefficient query plans that use expensive nested joins or sorts for merge joins.</p></td> -</tr> -<tr> -<th class="tableblock halign-left valign-top"><p class="tableblock"><strong>Level</strong></p></th> -<td class="tableblock halign-left valign-top"><p class="tableblock">Query.</p></td> -</tr> -<tr> -<th class="tableblock halign-left valign-top"><p class="tableblock"><strong>Conflicts/Synergies</strong></p></th> -<td class="tableblock halign-left valign-top"><p class="tableblock">If you turn all three join implementations OFF (Hash Joins, Nested Joins, and Merge Joins), then the compiler may fail to generate query plans.</p></td> -</tr> -<tr> -<th class="tableblock halign-left valign-top"><p class="tableblock"><strong>Real Problem Addressed</strong></p></th> -<td class="tableblock halign-left valign-top"><p class="tableblock">Not applicable.</p></td> -</tr> -<tr> -<th class="tableblock halign-left valign-top"><p class="tableblock"><strong>Introduced In Release</strong></p></th> -<td class="tableblock halign-left valign-top"><p class="tableblock">Trafodion 1.3.0.</p></td> -</tr> -<tr> -<th class="tableblock halign-left valign-top"><p class="tableblock"><strong>Deprecated In Release</strong></p></th> -<td class="tableblock halign-left valign-top"><p class="tableblock">Not applicable.</p></td> -</tr> -</tbody> -</table> -<div style="page-break-after: always;"></div> -</div> -<div class="sect2"> -<h3 id="hbase-coprocessors">3.3. HBASE_COPROCESSORS</h3> -<table class="tableblock frame-all grid-all spread"> -<colgroup> -<col style="width: 25%;"> -<col style="width: 75%;"> -</colgroup> -<tbody> -<tr> -<th class="tableblock halign-left valign-top"><p class="tableblock"><strong>Description</strong></p></th> -<td class="tableblock halign-left valign-top"><p class="tableblock">Allow HBase coprocessors to be used when computing aggregates.</p></td> -</tr> -<tr> -<th class="tableblock halign-left valign-top"><p class="tableblock"><strong>Values</strong></p></th> -<td class="tableblock halign-left valign-top"><p class="tableblock"><strong>'ON'</strong>: Use HBase coprocessors.<br> -<strong>'OFF'</strong>: Do not use HBase coprocessors.<br> -<br> -The default value is <strong>'ON'</strong>.</p></td> -</tr> -<tr> -<th class="tableblock halign-left valign-top"><p class="tableblock"><strong>Usage</strong></p></th> -<td class="tableblock halign-left valign-top"><p class="tableblock">Enables Trafodion to use HBase coprocessors to do early aggregation and filtering -at the HBase Region Server level. This CQD does not affect Transaction coprocessors used by Trafodion.<br> -<br> -As of Release 2.0 only COUNT(*) queries will be affected by this attribute.</p></td> -</tr> -<tr> -<th class="tableblock halign-left valign-top"><p class="tableblock"><strong>Production Usage</strong></p></th> -<td class="tableblock halign-left valign-top"><p class="tableblock">Yes.</p></td> -</tr> -<tr> -<th class="tableblock halign-left valign-top"><p class="tableblock"><strong>Impact</strong></p></th> -<td class="tableblock halign-left valign-top"><p class="tableblock">Network traffic between Region Server and Trafodion processes is reduced but -the Region Server can become very busy when aggregating over large tables.</p></td> -</tr> -<tr> -<th class="tableblock halign-left valign-top"><p class="tableblock"><strong>Level</strong></p></th> -<td class="tableblock halign-left valign-top"><p class="tableblock">Query.</p></td> -</tr> -<tr> -<th class="tableblock halign-left valign-top"><p class="tableblock"><strong>Conflicts/Synergies</strong></p></th> -<td class="tableblock halign-left valign-top"><p class="tableblock">Not applicable.</p></td> -</tr> -<tr> -<th class="tableblock halign-left valign-top"><p class="tableblock"><strong>Real Problem Addressed</strong></p></th> -<td class="tableblock halign-left valign-top"><p class="tableblock">Not applicable.</p></td> -</tr> -<tr> -<th class="tableblock halign-left valign-top"><p class="tableblock"><strong>Introduced In Release</strong></p></th> -<td class="tableblock halign-left valign-top"><p class="tableblock">Trafodion 1.3.0.</p></td> -</tr> -<tr> -<th class="tableblock halign-left valign-top"><p class="tableblock"><strong>Deprecated In Release</strong></p></th> -<td class="tableblock halign-left valign-top"><p class="tableblock">Not applicable.</p></td> -</tr> -</tbody> -</table> -<div style="page-break-after: always;"></div> -</div> -<div class="sect2"> -<h3 id="hive-num-esps-per-datanode">3.4. HIVE_NUM_ESPS_PER_DATANODE</h3> -<table class="tableblock frame-all grid-all spread"> -<colgroup> -<col style="width: 25%;"> -<col style="width: 75%;"> -</colgroup> -<tbody> -<tr> -<th class="tableblock halign-left valign-top"><p class="tableblock"><strong>Description</strong></p></th> -<td class="tableblock halign-left valign-top"><p class="tableblock">Determines number of ESP processes used to scan a Hive table, per HDFS DataNode.</p></td> -</tr> -<tr> -<th class="tableblock halign-left valign-top"><p class="tableblock"><strong>Values</strong></p></th> -<td class="tableblock halign-left valign-top"><p class="tableblock">Positive integer.<br> -<br> -The default value is <strong>'2'</strong>.</p></td> -</tr> -<tr> -<th class="tableblock halign-left valign-top"><p class="tableblock"><strong>Usage</strong></p></th> -<td class="tableblock halign-left valign-top"><p class="tableblock">Use this CQD to increase or decrease the number of scanners that process a single Hive table. -If a Hive scan is found to be the bottleneck for a particular query, then increasing this attribute to; for example, 4 or higher will help. -On the other hand decreasing the attribute to 1 could help with concurrency.</p></td> -</tr> -<tr> -<th class="tableblock halign-left valign-top"><p class="tableblock"><strong>Production Usage</strong></p></th> -<td class="tableblock halign-left valign-top"><p class="tableblock">Yes.</p></td> -</tr> -<tr> -<th class="tableblock halign-left valign-top"><p class="tableblock"><strong>Impact</strong></p></th> -<td class="tableblock halign-left valign-top"><p class="tableblock">Controls number of ESPs and, therefore, affects query execution time and system workload.</p></td> -</tr> -<tr> -<th class="tableblock halign-left valign-top"><p class="tableblock"><strong>Level</strong></p></th> -<td class="tableblock halign-left valign-top"><p class="tableblock">Query.</p></td> -</tr> -<tr> -<th class="tableblock halign-left valign-top"><p class="tableblock"><strong>Conflicts/Synergies</strong></p></th> -<td class="tableblock halign-left valign-top"><p class="tableblock">The CQD <a href="#hive-min-bytes-per-esp-partition">HIVE_MIN_BYTES_PER_ESP_PARTITION</a> (default = 67108864) may need to be adjusted downward -when this attribute is used to increase the parallelism of scanning smaller Hive tables.</p></td> -</tr> -<tr> -<th class="tableblock halign-left valign-top"><p class="tableblock"><strong>Real Problem Addressed</strong></p></th> -<td class="tableblock halign-left valign-top"><p class="tableblock">Not applicable.</p></td> -</tr> -<tr> -<th class="tableblock halign-left valign-top"><p class="tableblock"><strong>Introduced In Release</strong></p></th> -<td class="tableblock halign-left valign-top"><p class="tableblock">Trafodion 1.3.0.</p></td> -</tr> -<tr> -<th class="tableblock halign-left valign-top"><p class="tableblock"><strong>Deprecated In Release</strong></p></th> -<td class="tableblock halign-left valign-top"><p class="tableblock">Not applicable.</p></td> -</tr> -</tbody> -</table> -<div style="page-break-after: always;"></div> -</div> -<div class="sect2"> -<h3 id="join-order-by-user">3.5. JOIN_ORDER_BY_USER</h3> -<table class="tableblock frame-all grid-all spread"> -<colgroup> -<col style="width: 25%;"> -<col style="width: 75%;"> -</colgroup> -<tbody> -<tr> -<th class="tableblock halign-left valign-top"><p class="tableblock"><strong>Description</strong></p></th> -<td class="tableblock halign-left valign-top"><p class="tableblock">Enables or disables the join order in which the optimizer joins the tables to be the sequence of the -tables in the FROM clause of the query.</p></td> -</tr> -<tr> -<th class="tableblock halign-left valign-top"><p class="tableblock"><strong>Values</strong></p></th> -<td class="tableblock halign-left valign-top"><p class="tableblock"><strong>'ON'</strong> Join order is forced.<br> -<strong>'OFF'</strong> Join order is decided by the optimizer.<br> -<br> -The default value is <strong>'OFF'</strong>.</p></td> -</tr> -<tr> -<th class="tableblock halign-left valign-top"><p class="tableblock"><strong>Usage</strong></p></th> -<td class="tableblock halign-left valign-top"><p class="tableblock">When set to ON, the optimizer considers only execution plans that have the join order matching -the sequence of the tables in the FROM clause.</p></td> -</tr> -<tr> -<th class="tableblock halign-left valign-top"><p class="tableblock"><strong>Production Usage</strong></p></th> -<td class="tableblock halign-left valign-top"><p class="tableblock">This setting is to be used for forcing a desired join order that was not generated by default by -the optimizer only. It can be used as a workaround for query plans with inefficient join order.</p></td> -</tr> -<tr> -<th class="tableblock halign-left valign-top"><p class="tableblock"><strong>Impact</strong></p></th> -<td class="tableblock halign-left valign-top"><p class="tableblock">Because you are in effect forcing the optimizer to use a plan that joins the table in the order -specified in the FROM clause, the plan generated may not be the optimal one.</p></td> -</tr> -<tr> -<th class="tableblock halign-left valign-top"><p class="tableblock"><strong>Level</strong></p></th> -<td class="tableblock halign-left valign-top"><p class="tableblock">Query.</p></td> -</tr> -<tr> -<th class="tableblock halign-left valign-top"><p class="tableblock"><strong>Conflicts/Synergies</strong></p></th> -<td class="tableblock halign-left valign-top"><p class="tableblock">Not applicable.</p></td> -</tr> -<tr> -<th class="tableblock halign-left valign-top"><p class="tableblock"><strong>Real Problem Addressed</strong></p></th> -<td class="tableblock halign-left valign-top"><p class="tableblock">Not applicable.</p></td> -</tr> -<tr> -<th class="tableblock halign-left valign-top"><p class="tableblock"><strong>Introduced In Release</strong></p></th> -<td class="tableblock halign-left valign-top"><p class="tableblock">Trafodion 1.3.0.</p></td> -</tr> -<tr> -<th class="tableblock halign-left valign-top"><p class="tableblock"><strong>Deprecated In Release</strong></p></th> -<td class="tableblock halign-left valign-top"><p class="tableblock">Not applicable.</p></td> -</tr> -</tbody> -</table> -<div style="page-break-after: always;"></div> -</div> -<div class="sect2"> -<h3 id="mc-skew-sensitivity-threshold">3.6. MC_SKEW_SENSITIVITY_THRESHOLD</h3> -<table class="tableblock frame-all grid-all spread"> -<colgroup> -<col style="width: 25%;"> -<col style="width: 75%;"> -</colgroup> -<tbody> -<tr> -<th class="tableblock halign-left valign-top"><p class="tableblock"><strong>Description</strong></p></th> -<td class="tableblock halign-left valign-top"><p class="tableblock">Define the multi-column skew sensitivity threshold T used by multi-column skew-insensitive hash join (Skew Buster).<br> -<br> -Let <code>f</code> be the occurrence frequency of a skew value <code>v</code>, <code>DoP</code> be the degree of parallelism of a hash join operator, and <code>RC</code> be the row count of -the source data (for example, fact table) where the skew originates.<br> -<br> -The hash join will run in the anti-skew mode for <code>v</code> if <code>f >= T * DoP / RC</code>.</p></td> -</tr> -<tr> -<th class="tableblock halign-left valign-top"><p class="tableblock"><strong>Values</strong></p></th> -<td class="tableblock halign-left valign-top"><p class="tableblock"><strong>< 0</strong>: Disable the multi-column skew buster.<br> -<strong>>= 0</strong>: Define the threshold T.<br> -<br> -Default value: <strong>0.1</strong>.</p></td> -</tr> -<tr> -<th class="tableblock halign-left valign-top"><p class="tableblock"><strong>Usage</strong></p></th> -<td class="tableblock halign-left valign-top"><p class="tableblock">Use of a <strong>negative value</strong> to disable multi-column anti-skew hash joins. This may slow down query performance when -multi-column skew values are present in the fact table.<br> -<br> -A value of <strong>0</strong> treats every multi-column value as skew values. This may increase network traffic since skewed values are broadcasted from the inner -side child of the hash join to all join processes.<br> -<br> -A value <strong>greater than 0</strong> selects those multi-column values as skewed values if their occurrence frequencies are high enough.</p></td> -</tr> -<tr> -<th class="tableblock halign-left valign-top"><p class="tableblock"><strong>Production Usage</strong></p></th> -<td class="tableblock halign-left valign-top"><p class="tableblock">Please contact <a href="mailto:[email protected]";>[email protected]</a>.</p></td> -</tr> -<tr> -<th class="tableblock halign-left valign-top"><p class="tableblock"><strong>Impact</strong></p></th> -<td class="tableblock halign-left valign-top"><p class="tableblock">This CQD impacts runtime performance.</p></td> -</tr> -<tr> -<th class="tableblock halign-left valign-top"><p class="tableblock"><strong>Level</strong></p></th> -<td class="tableblock halign-left valign-top"><p class="tableblock">Session.</p></td> -</tr> -<tr> -<th class="tableblock halign-left valign-top"><p class="tableblock"><strong>Conflicts/Synergies</strong></p></th> -<td class="tableblock halign-left valign-top"><p class="tableblock">Not applicable.</p></td> -</tr> -<tr> -<th class="tableblock halign-left valign-top"><p class="tableblock"><strong>Real Problem Addressed</strong></p></th> -<td class="tableblock halign-left valign-top"><p class="tableblock">Not applicable.</p></td> -</tr> -<tr> -<th class="tableblock halign-left valign-top"><p class="tableblock"><strong>Introduced In Release</strong></p></th> -<td class="tableblock halign-left valign-top"><p class="tableblock">Trafodion 1.3.0.</p></td> -</tr> -<tr> -<th class="tableblock halign-left valign-top"><p class="tableblock"><strong>Deprecated In Release</strong></p></th> -<td class="tableblock halign-left valign-top"><p class="tableblock">Not applicable.</p></td> -</tr> -</tbody> -</table> -<div style="page-break-after: always;"></div> -</div> -<div class="sect2"> -<h3 id="mdam-no-stats-positions-threshold">3.7. MDAM_NO_STATS_POSITIONS_THRESHOLD</h3> -<table class="tableblock frame-all grid-all spread"> -<colgroup> -<col style="width: 25%;"> -<col style="width: 75%;"> -</colgroup> -<tbody> -<tr> -<th class="tableblock halign-left valign-top"><p class="tableblock"><strong>Description</strong></p></th> -<td class="tableblock halign-left valign-top"><p class="tableblock">This CQD effects the behavior of the query optimizer when there are no statistics available for a query -having range predicates on key columns. The Trafodion Optimizer calculates the worst case number of seeks that the MDAM access method -would do if chosen for the query.<br> -<br> -If this number is greater than the value of MDAM_NO_STATS_POSITIONS_THRESHOLD, then MDAM is not considered for the query execution plan.</p></td> -</tr> -<tr> -<th class="tableblock halign-left valign-top"><p class="tableblock"><strong>Values</strong></p></th> -<td class="tableblock halign-left valign-top"><p class="tableblock">Any integer greater than equal to zero.<br> -<br> -Default value: <strong>10</strong>.</p></td> -</tr> -<tr> -<th class="tableblock halign-left valign-top"><p class="tableblock"><strong>Usage</strong></p></th> -<td class="tableblock halign-left valign-top"><p class="tableblock">In certain situations, queries on tables lacking statistics may not be optimal because MDAM was not chosen. -Increasing the value for this CQD allows MDAM to be chosen in more cases. On the other hand, if the value is made too high and the worst case -scenario actually occurs, an MDAM plan may perform poorly.</p></td> -</tr> -<tr> -<th class="tableblock halign-left valign-top"><p class="tableblock"><strong>Production Usage</strong></p></th> -<td class="tableblock halign-left valign-top"><p class="tableblock">Please contact <a href="mailto:[email protected]";>[email protected]</a>.</p></td> -</tr> -<tr> -<th class="tableblock halign-left valign-top"><p class="tableblock"><strong>Impact</strong></p></th> -<td class="tableblock halign-left valign-top"><p class="tableblock">Table scans on tables lacking statistics may improve by varying the value of this CQD. -Results vary depending on the actual data in the table and the semantics of the query.</p></td> -</tr> -<tr> -<th class="tableblock halign-left valign-top"><p class="tableblock"><strong>Level</strong></p></th> -<td class="tableblock halign-left valign-top"><p class="tableblock">Query.</p></td> -</tr> -<tr> -<th class="tableblock halign-left valign-top"><p class="tableblock"><strong>Conflicts/Synergies</strong></p></th> -<td class="tableblock halign-left valign-top"><p class="tableblock">If <a href="#mdam-scan-method">MDAM_SCAN_METHOD</a> is set to <strong>'OFF'</strong>, then this CQD has no effect.</p></td> -</tr> -<tr> -<th class="tableblock halign-left valign-top"><p class="tableblock"><strong>Real Problem Addressed</strong></p></th> -<td class="tableblock halign-left valign-top"><p class="tableblock">Perform UPDATE STATISTICS on the table (at the very least on key columns) to obtain statistics.</p></td> -</tr> -<tr> -<th class="tableblock halign-left valign-top"><p class="tableblock"><strong>Introduced In Release</strong></p></th> -<td class="tableblock halign-left valign-top"><p class="tableblock">Trafodion 1.3.0.</p></td> -</tr> -<tr> -<th class="tableblock halign-left valign-top"><p class="tableblock"><strong>Deprecated In Release</strong></p></th> -<td class="tableblock halign-left valign-top"><p class="tableblock">Not applicable.</p></td> -</tr> -</tbody> -</table> -<div style="page-break-after: always;"></div> -</div> -<div class="sect2"> -<h3 id="mdam-scan-method">3.8. MDAM_SCAN_METHOD</h3> -<table class="tableblock frame-all grid-all spread"> -<colgroup> -<col style="width: 25%;"> -<col style="width: 75%;"> -</colgroup> -<tbody> -<tr> -<th class="tableblock halign-left valign-top"><p class="tableblock"><strong>Description</strong></p></th> -<td class="tableblock halign-left valign-top"><p class="tableblock">Enables or disables the Multi-Dimensional Access Method (MDAM).</p></td> -</tr> -<tr> -<th class="tableblock halign-left valign-top"><p class="tableblock"><strong>Values</strong></p></th> -<td class="tableblock halign-left valign-top"><p class="tableblock"><strong>'ON'</strong> MDAM is considered.<br> -<strong>'OFF'</strong> MDAM is disabled.<br> -<br> -The default value is <strong>'ON'</strong>.</p></td> -</tr> -<tr> -<th class="tableblock halign-left valign-top"><p class="tableblock"><strong>Usage</strong></p></th> -<td class="tableblock halign-left valign-top"><p class="tableblock">In certain situations, the Trafodion Optimizer might choose MDAM inappropriately, causing poor performance. -In such situations you may want to turn MDAM OFF for the query it is effecting.</p></td> -</tr> -<tr> -<th class="tableblock halign-left valign-top"><p class="tableblock"><strong>Production Usage</strong></p></th> -<td class="tableblock halign-left valign-top"><p class="tableblock">Yes.</p></td> -</tr> -<tr> -<th class="tableblock halign-left valign-top"><p class="tableblock"><strong>Impact</strong></p></th> -<td class="tableblock halign-left valign-top"><p class="tableblock">Table scans with predicates on non-leading clustering key column(s) could benefit from MDAM access -method if the leading column(s) has a small number of distinct values. Turning MDAM off results in a longer scan time for such queries.</p></td> -</tr> -<tr> -<th class="tableblock halign-left valign-top"><p class="tableblock"><strong>Level</strong></p></th> -<td class="tableblock halign-left valign-top"><p class="tableblock">Set this CQD at the query level when MDAM is not working efficiently for a specific query. However, -there may be cases (usually a defect) where a larger set of queries is being negatively impacted by MDAM. In those cases you may want -to set it at the service or system level.</p></td> -</tr> -<tr> -<th class="tableblock halign-left valign-top"><p class="tableblock"><strong>Conflicts/Synergies</strong></p></th> -<td class="tableblock halign-left valign-top"><p class="tableblock">Not applicable.</p></td> -</tr> -<tr> -<th class="tableblock halign-left valign-top"><p class="tableblock"><strong>Real Problem Addressed</strong></p></th> -<td class="tableblock halign-left valign-top"><p class="tableblock">Not applicable.</p></td> -</tr> -<tr> -<th class="tableblock halign-left valign-top"><p class="tableblock"><strong>Introduced In Release</strong></p></th> -<td class="tableblock halign-left valign-top"><p class="tableblock">Trafodion 1.3.0.</p></td> -</tr> -<tr> -<th class="tableblock halign-left valign-top"><p class="tableblock"><strong>Deprecated In Release</strong></p></th> -<td class="tableblock halign-left valign-top"><p class="tableblock">Not applicable.</p></td> -</tr> -</tbody> -</table> -<div style="page-break-after: always;"></div> -</div> -<div class="sect2"> -<h3 id="merge-joins">3.9. MERGE_JOINS</h3> -<table class="tableblock frame-all grid-all spread"> -<colgroup> -<col style="width: 25%;"> -<col style="width: 75%;"> -</colgroup> -<tbody> -<tr> -<th class="tableblock halign-left valign-top"><p class="tableblock"><strong>Description</strong></p></th> -<td class="tableblock halign-left valign-top"><p class="tableblock">Determines if Merge Join is considered by the optimizer to generate an execution plan.</p></td> -</tr> -<tr> -<th class="tableblock halign-left valign-top"><p class="tableblock"><strong>Values</strong></p></th> -<td class="tableblock halign-left valign-top"><p class="tableblock"><strong>'ON'</strong>: Merge Join is considered.<br> -<strong>'OFF'</strong>: Merge Join is disabled.<br> -<br> -The default value is <strong>'ON'</strong>.</p></td> -</tr> -<tr> -<th class="tableblock halign-left valign-top"><p class="tableblock"><strong>Usage</strong></p></th> -<td class="tableblock halign-left valign-top"><p class="tableblock">Use this CQD when you want to force a query plan not to use Merge Joins. This is useful as a workaround -for query plans with very expensive sorts for Merge Joins. Turning MERGE_JOINS OFF also has the advantage of reducing the query compile time.</p></td> -</tr> -<tr> -<th class="tableblock halign-left valign-top"><p class="tableblock"><strong>Production Usage</strong></p></th> -<td class="tableblock halign-left valign-top"><p class="tableblock">Merge Join is an efficient join implementation strategy if the physical schema was designed to take advantage -of it. For example, large tables are physically ordered based on the most frequently joined column(s).</p></td> -</tr> -<tr> -<th class="tableblock halign-left valign-top"><p class="tableblock"><strong>Impact</strong></p></th> -<td class="tableblock halign-left valign-top"><p class="tableblock">Turning MERGE_JOINS OFF may result in the optimizer not considering potentially efficient query plans, -for queries with large joins on tables that are physically ordered by the join column(s).<br> -<br> -Turning MERGE_JOINS ON causes an increase in compile -time because the optimizer now has to consider many more join options.</p></td> -</tr> -<tr> -<th class="tableblock halign-left valign-top"><p class="tableblock"><strong>Level</strong></p></th> -<td class="tableblock halign-left valign-top"><p class="tableblock">Set this CQD at the query level when a Merge Join is not working efficiently for a specific query. However, -there may be cases (usually a defect) where a larger set of queries is being negatively impacted by Merge Joins. In those cases you may want to -set it at the service or system level.</p></td> -</tr> -<tr> -<th class="tableblock halign-left valign-top"><p class="tableblock"><strong>Conflicts/Synergies</strong></p></th> -<td class="tableblock halign-left valign-top"><p class="tableblock">Avoid turning all the three join implementations OFF (Hash Joins, Nested Joins, and Merge Joins). -This may result in the Trafodion Compiler failing to generate query plans.</p></td> -</tr> -<tr> -<th class="tableblock halign-left valign-top"><p class="tableblock"><strong>Real Problem Addressed</strong></p></th> -<td class="tableblock halign-left valign-top"><p class="tableblock">Not applicable.</p></td> -</tr> -<tr> -<th class="tableblock halign-left valign-top"><p class="tableblock"><strong>Introduced In Release</strong></p></th> -<td class="tableblock halign-left valign-top"><p class="tableblock">Trafodion 1.3.0.</p></td> -</tr> -<tr> -<th class="tableblock halign-left valign-top"><p class="tableblock"><strong>Deprecated In Release</strong></p></th> -<td class="tableblock halign-left valign-top"><p class="tabl
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