Author: elserj
Date: Thu Jan  9 16:46:20 2020
New Revision: 1872559

URL: http://svn.apache.org/viewvc?rev=1872559&view=rev
Log:
Getting faq re-published

Removed:
    phoenix/site/publish/0.
Modified:
    phoenix/site/publish/faq.html
    phoenix/site/publish/language/datatypes.html
    phoenix/site/publish/language/functions.html
    phoenix/site/publish/language/index.html
    phoenix/site/source/src/site/markdown/faq.md

Modified: phoenix/site/publish/faq.html
URL: 
http://svn.apache.org/viewvc/phoenix/site/publish/faq.html?rev=1872559&r1=1872558&r2=1872559&view=diff
==============================================================================
--- phoenix/site/publish/faq.html (original)
+++ phoenix/site/publish/faq.html Thu Jan  9 16:46:20 2020
@@ -0,0 +1,694 @@
+
+<!DOCTYPE html>
+<!--
+ Generated by Apache Maven Doxia at 2020-01-09
+ Rendered using Reflow Maven Skin 1.1.0 
(http://andriusvelykis.github.io/reflow-maven-skin)
+-->
+<html  xml:lang="en" lang="en">
+
+       <head>
+               <meta charset="UTF-8" />
+               <title>F.A.Q. | Apache Phoenix</title>
+               <meta name="viewport" content="width=device-width, 
initial-scale=1.0" />
+               <meta name="description" content="" />
+               <meta http-equiv="content-language" content="en" />
+
+               <link 
href="//netdna.bootstrapcdn.com/bootswatch/2.3.2/flatly/bootstrap.min.css" 
rel="stylesheet" />
+               <link 
href="//netdna.bootstrapcdn.com/twitter-bootstrap/2.3.1/css/bootstrap-responsive.min.css"
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+               <link href="./css/bootswatch.css" rel="stylesheet" />
+               <link href="./css/reflow-skin.css" rel="stylesheet" />
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+               <link href="//yandex.st/highlightjs/7.5/styles/default.min.css" 
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+               
+               <link href="./css/lightbox.css" rel="stylesheet" />
+               
+               <link href="./css/site.css" rel="stylesheet" />
+               <link href="./css/print.css" rel="stylesheet" media="print" />
+               
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+               <!--[if lt IE 9]>
+                       <script 
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+               <![endif]-->
+
+
+
+       </head>
+
+       <body class="page-faq project-phoenix-site" data-spy="scroll" 
data-offset="60" data-target="#toc-scroll-target">
+
+               <div class="navbar navbar-fixed-top">
+                       <div class="navbar-inner">
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+                                       <div class="nav-collapse collapse" 
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+                                               <ul class="nav pull-right">
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+                                                               <ul 
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+                                                                       <li ><a 
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+                                                                       <li ><a 
href="who_is_using.html" title="Who is Using">Who is Using</a></li>
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+                                                                       <li ><a 
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Website</a></li>
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+                                                                       <li 
class="active"><a href="" title="F.A.Q.">F.A.Q.</a></li>
+                                                                       <li ><a 
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Start</a></li>
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Compatibility</a></li>
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href="release_notes.html" title="Release Notes">Release Notes</a></li>
+                                                                       <li ><a 
href="pherf.html" title="Performance Testing">Performance Testing</a></li>
+                                                                       <li 
class="divider"/>
+                                                                       <li ><a 
href="phoenix_spark.html" title="Apache Spark Integration">Apache Spark 
Integration</a></li>
+                                                                       <li ><a 
href="hive_storage_handler.html" title="Phoenix Storage Handler for Apache 
Hive">Phoenix Storage Handler for Apache Hive</a></li>
+                                                                       <li ><a 
href="pig_integration.html" title="Apache Pig Integration">Apache Pig 
Integration</a></li>
+                                                                       <li ><a 
href="phoenix_mr.html" title="Map Reduce Integration">Map Reduce 
Integration</a></li>
+                                                                       <li ><a 
href="flume.html" title="Apache Flume Plugin">Apache Flume Plugin</a></li>
+                                                                       <li ><a 
href="kafka.html" title="Apache Kafka Plugin">Apache Kafka Plugin</a></li>
+                                                                       <li ><a 
href="python.html" title="Python Driver">Python Driver</a></li>
+                                                               </ul>
+                                                       </li>
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+                                                               <a href="#" 
class="dropdown-toggle" data-toggle="dropdown">Addons <b class="caret"></b></a>
+                                                               <ul 
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+                                                                       <li ><a 
href="http://docs.aws.amazon.com/ElasticMapReduce/latest/ReleaseGuide/emr-phoenix.html";
 title="Phoenix on Amazon EMR" class="externalLink">Phoenix on Amazon 
EMR</a></li>
+                                                                       <li ><a 
href="http://python-phoenixdb.readthedocs.io/en/latest"; title="Phoenix Adapter 
for Python" class="externalLink">Phoenix Adapter for Python</a></li>
+                                                                       <li ><a 
href="phoenix_orm.html" title="Phoenix ORM Library">Phoenix ORM Library</a></li>
+                                                                       <li ><a 
href="https://prestosql.io/docs/current/connector/phoenix.html"; title="Phoenix 
Connector for Presto" class="externalLink">Phoenix Connector for Presto</a></li>
+                                                                       <li ><a 
href="omid.html" title="Apache Phoenix Omid Transaction Manager">Apache Phoenix 
Omid Transaction Manager</a></li>
+                                                                       <li ><a 
href="tephra.html" title="Apache Phoenix Tephra Transaction Manager">Apache 
Phoenix Tephra Transaction Manager</a></li>
+                                                               </ul>
+                                                       </li>
+                                                       <li class="dropdown">
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+                                                                       <li ><a 
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+                                                                       <li ><a 
href="udf.html" title="User-defined Functions">User-defined Functions</a></li>
+                                                                       <li 
class="divider"/>
+                                                                       <li ><a 
href="secondary_indexing.html" title="Secondary Indexes">Secondary 
Indexes</a></li>
+                                                                       <li ><a 
href="columnencoding.html" title="Storage Formats">Storage Formats</a></li>
+                                                                       <li ><a 
href="atomic_upsert.html" title="Atomic Upsert">Atomic Upsert</a></li>
+                                                                       <li ><a 
href="namspace_mapping.html" title="Namespace Mapping">Namespace 
Mapping</a></li>
+                                                                       <li ><a 
href="update_statistics.html" title="Statistics Collection">Statistics 
Collection</a></li>
+                                                                       <li ><a 
href="rowtimestamp.html" title="Row Timestamp Column">Row Timestamp 
Column</a></li>
+                                                                       <li ><a 
href="paged.html" title="Paged Queries">Paged Queries</a></li>
+                                                                       <li ><a 
href="salted.html" title="Salted Tables">Salted Tables</a></li>
+                                                                       <li ><a 
href="skip_scan.html" title="Skip Scan">Skip Scan</a></li>
+                                                                       <li ><a 
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+                                                                       <li ><a 
href="multi-tenancy.html" title="Multi tenancy">Multi tenancy</a></li>
+                                                                       <li ><a 
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+                                                                       <li 
class="divider"/>
+                                                                       <li ><a 
href="bulk_dataload.html" title="Bulk Loading">Bulk Loading</a></li>
+                                                                       <li ><a 
href="server.html" title="Query Server">Query Server</a></li>
+                                                                       <li ><a 
href="metrics.html" title="Metrics">Metrics</a></li>
+                                                                       <li ><a 
href="tracing.html" title="Tracing">Tracing</a></li>
+                                                                       <li ><a 
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+                                                               </ul>
+                                                       </li>
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+                                                               <a href="#" 
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+                                                               <ul 
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+                                                                       <li ><a 
href="language/index.html" title="Grammar">Grammar</a></li>
+                                                                       <li ><a 
href="language/functions.html" title="Functions">Functions</a></li>
+                                                                       <li ><a 
href="language/datatypes.html" title="Datatypes">Datatypes</a></li>
+                                                                       <li ><a 
href="array_type.html" title="ARRAY type">ARRAY type</a></li>
+                                                                       <li 
class="divider"/>
+                                                                       <li ><a 
href="sequences.html" title="Sequences">Sequences</a></li>
+                                                                       <li ><a 
href="joins.html" title="Joins">Joins</a></li>
+                                                                       <li ><a 
href="subqueries.html" title="Subqueries">Subqueries</a></li>
+                                                                       <li ><a 
href="explainplan.html" title="Explain Plan">Explain Plan</a></li>
+                                                               </ul>
+                                                       </li>
+                                               </ul>
+                                       </div><!--/.nav-collapse -->
+                               </div>
+                       </div>
+               </div>
+               
+       <div class="container">
+       
+       <!-- Masthead
+       ================================================== -->
+
+       <header>
+       </header>
+
+       <div class="main-body">
+       <div class="row">
+               <div class="span12">
+                       <div class="body-content">
+<div class="page-header">
+ <h1>F.A.Q.</h1>
+</div> 
+<ul> 
+ <li><a href="#I_want_to_get_started_Is_there_a_Phoenix_Hello_World">I want to 
get started. Is there a Phoenix Hello World?</a></li> 
+ <li><a href="#What_is_the_Phoenix_JDBC_URL_syntax">What is the Phoenix JDBC 
URL syntax?</a></li> 
+ <li><a href="#Is_there_a_way_to_bulk_load_in_Phoenix">Is there a way to bulk 
load in Phoenix?</a></li> 
+ <li><a href="#How_I_map_Phoenix_table_to_an_existing_HBase_table">How I map 
Phoenix table to an existing HBase table?</a></li> 
+ <li><a href="#Are_there_any_tips_for_optimizing_Phoenix">Are there any tips 
for optimizing Phoenix?</a></li> 
+ <li><a href="#How_do_I_create_Secondary_Index_on_a_table">How do I create 
Secondary Index on a table?</a></li> 
+ <li><a href="#Why_isnt_my_secondary_index_being_used">Why isn’t my 
secondary index being used?</a></li> 
+ <li><a href="#How_fast_is_Phoenix_Why_is_it_so_fast">How fast is Phoenix? Why 
is it so fast?</a></li> 
+ <li><a href="#How_do_I_connect_to_secure_HBase_cluster">How do I connect to 
secure HBase cluster?</a></li> 
+ <li><a href="#How_do_I_connect_with_HBase_running_on_Hadoop-2">How do I 
connect with HBase running on Hadoop-2?</a></li> 
+ <li><a 
href="#Can_phoenix_work_on_tables_with_arbitrary_timestamp_as_flexible_as_HBase_API">Can
 phoenix work on tables with arbitrary timestamp as flexible as HBase 
API?</a></li> 
+ <li><a href="#Why_isnt_my_query_doing_a_RANGE_SCAN">Why isn’t my query 
doing a RANGE SCAN?</a></li> 
+ <li><a href="#Should_I_pool_Phoenix_JDBC_Connections">Should I pool Phoenix 
JDBC Connections?</a></li> 
+ <li><a href="#Why_empty_key_value">Why does Phoenix add an empty or dummy 
KeyValue when doing an upsert?</a></li> 
+</ul> 
+<div class="section"> 
+ <div class="section"> 
+  <h3 id="I_want_to_get_started._Is_there_a_Phoenix_Hello_World">I want to get 
started. Is there a Phoenix <i>Hello World</i>?</h3> 
+  <p><i>Pre-requisite:</i> Download latest Phoenix from <a 
href="download.html">here</a> and copy phoenix-*.jar to HBase lib folder and 
restart HBase.</p> 
+  <p><b>1. Using console</b></p> 
+  <ol style="list-style-type: decimal"> 
+   <li>Start Sqlline: <tt>$ sqlline.py [zookeeper]</tt></li> 
+   <li>Execute the following statements when Sqlline connects:</li> 
+  </ol> 
+  <div class="source"> 
+   <pre>create table test (mykey integer not null primary key, mycolumn 
varchar);
+upsert into test values (1,'Hello');
+upsert into test values (2,'World!');
+select * from test;
+</pre> 
+  </div> 
+  <ol style="list-style-type: decimal"> 
+   <li>You should get the following output</li> 
+  </ol> 
+  <div class="source"> 
+   <pre>+-------+------------+
+| MYKEY |  MYCOLUMN  |
++-------+------------+
+| 1     | Hello      |
+| 2     | World!     |
++-------+------------+
+</pre> 
+  </div> 
+  <p><b>2. Using java</b></p> 
+  <p>Create test.java file with the following content:</p> 
+  <div class="source"> 
+   <pre>import java.sql.Connection;
+import java.sql.DriverManager;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.sql.PreparedStatement;
+import java.sql.Statement;
+
+public class test {
+
+       public static void main(String[] args) throws SQLException {
+               Statement stmt = null;
+               ResultSet rset = null;
+               
+               Connection con = 
DriverManager.getConnection(&quot;jdbc:phoenix:[zookeeper]&quot;);
+               stmt = con.createStatement();
+               
+               stmt.executeUpdate(&quot;create table test (mykey integer not 
null primary key, mycolumn varchar)&quot;);
+               stmt.executeUpdate(&quot;upsert into test values 
(1,'Hello')&quot;);
+               stmt.executeUpdate(&quot;upsert into test values 
(2,'World!')&quot;);
+               con.commit();
+               
+               PreparedStatement statement = con.prepareStatement(&quot;select 
* from test&quot;);
+               rset = statement.executeQuery();
+               while (rset.next()) {
+                       
System.out.println(rset.getString(&quot;mycolumn&quot;));
+               }
+               statement.close();
+               con.close();
+       }
+}
+</pre> 
+  </div> 
+  <p>Compile and execute on command line</p> 
+  <p><tt>$ javac test.java</tt></p> 
+  <p><tt>$ java -cp &quot;../phoenix-[version]-client.jar:.&quot; 
test</tt></p> 
+  <p>You should get the following output</p> 
+  <p><tt>Hello</tt> <tt>World!</tt></p> 
+ </div> 
+ <div class="section"> 
+  <h3 id="What_is_the_Phoenix_JDBC_URL_syntax">What is the Phoenix JDBC URL 
syntax?</h3> 
+  <div class="section"> 
+   <h4 id="Thick_Driver">Thick Driver</h4> 
+   <p>The Phoenix (Thick) Driver JDBC URL syntax is as follows (where elements 
in square brackets are optional):</p> 
+   <p><tt>jdbc:phoenix:[comma-separated ZooKeeper Quorum [:port [:hbase root 
znode [:kerberos_principal [:path to kerberos keytab] ] ] ]</tt></p> 
+   <p>The simplest URL is:</p> 
+   <p><tt>jdbc:phoenix:localhost</tt></p> 
+   <p>Whereas the most complicated URL is:</p> 
+   
<p><tt>jdbc:phoenix:zookeeper1.domain,zookeeper2.domain,zookeeper3.domain:2181:/hbase-1:phoe...@example.com:/etc/security/keytabs/phoenix.keytab</tt></p>
 
+   <p>Please note that each optional element in the URL requires all previous 
optional elements. For example, to specify the HBase root ZNode, the ZooKeeper 
port <i>must</i> also be specified.</p> 
+   <p>This information is initially covered on the <a href="/#connStr">index 
page</a>.</p> 
+  </div> 
+  <div class="section"> 
+   <h4 id="Thin_Driver">Thin Driver</h4> 
+   <p>The Phoenix Thin Driver (used with the Phoenix Query Server) JDBC URL 
syntax is as follows:</p> 
+   <p><tt>jdbc:phoenix:thin:[key=value[;key=value...]]</tt></p> 
+   <p>There are a number of keys exposed for client-use. The most 
commonly-used keys are: <tt>url</tt> and <tt>serialization</tt>. The 
<tt>url</tt> key is required to interact with the Phoenix Query Server.</p> 
+   <p>The simplest URL is:</p> 
+   <p><tt>jdbc:phoenix:thin:url=http://localhost:8765</tt></p> 
+   <p>Where as very complicated URL is:</p> 
+   
<p><tt>jdbc:phoenix:thin:url=http://queryserver.domain:8765;serialization=PROTOBUF;authentication=SPENGO;principal=phoe...@example.com;keytab=/etc/security/keytabs/phoenix.keytab</tt></p>
 
+   <p>Please refer to the <a class="externalLink" 
href="https://calcite.apache.org/avatica/docs/client_reference.html";>Apache 
Avatica documentation</a> for a full list of supported options in the Thin 
client JDBC URL, or see the <a href="server.html">Query Server 
documentation</a></p> 
+  </div> 
+ </div> 
+ <div class="section"> 
+  <h3 id="Is_there_a_way_to_bulk_load_in_Phoenix">Is there a way to bulk load 
in Phoenix?</h3> 
+  <p><b>Map Reduce</b></p> 
+  <p>See the example <a href="bulk_dataload.html">here</a></p> 
+  <p><b>CSV</b></p> 
+  <p>CSV data can be bulk loaded with built in utility named psql. Typical 
upsert rates are 20K - 50K rows per second (depends on how wide are the 
rows).</p> 
+  <p>Usage example:<br />Create table using psql <tt>$ psql.py [zookeeper] 
../examples/web_stat.sql</tt> </p> 
+  <p>Upsert CSV bulk data <tt>$ psql.py [zookeeper] 
../examples/web_stat.csv</tt></p> 
+ </div> 
+ <div class="section"> 
+  <h3 id="How_I_map_Phoenix_table_to_an_existing_HBase_table">How I map 
Phoenix table to an existing HBase table?</h3> 
+  <p>You can create both a Phoenix table or view through the CREATE 
TABLE/CREATE VIEW DDL statement on a pre-existing HBase table. In both cases, 
we’ll leave the HBase metadata as-is. For CREATE TABLE, we’ll create any 
metadata (table, column families) that doesn’t already exist. We’ll also 
add an empty key value for each row so that queries behave as expected (without 
requiring all columns to be projected during scans).</p> 
+  <p>The other caveat is that the way the bytes were serialized must match the 
way the bytes are serialized by Phoenix. For VARCHAR,CHAR, and UNSIGNED_* 
types, we use the HBase Bytes methods. The CHAR type expects only single-byte 
characters and the UNSIGNED types expect values greater than or equal to zero. 
For signed types(TINYINT, SMALLINT, INTEGER and BIGINT), Phoenix will flip the 
first bit so that negative values will sort before positive values. Because 
HBase sorts row keys in lexicographical order and negative value’s first bit 
is 1 while positive 0 so that negative value is ‘greater than’ positive 
value if we don’t flip the first bit. So if you stored integers by HBase 
native API and want to access them by Phoenix, make sure that all your data 
types are UNSIGNED types.</p> 
+  <p>Our composite row keys are formed by simply concatenating the values 
together, with a zero byte character used as a separator after a variable 
length type.</p> 
+  <p>If you create an HBase table like this:</p> 
+  <p><tt>create 't1', {NAME =&gt; 'f1', VERSIONS =&gt; 5}</tt></p> 
+  <p>then you have an HBase table with a name of ‘t1’ and a column family 
with a name of ‘f1’. Remember, in HBase, you don’t model the possible 
KeyValues or the structure of the row key. This is the information you specify 
in Phoenix above and beyond the table and column family.</p> 
+  <p>So in Phoenix, you’d create a view like this:</p> 
+  <p><tt>CREATE VIEW &quot;t1&quot; ( pk VARCHAR PRIMARY KEY, 
&quot;f1&quot;.val VARCHAR )</tt></p> 
+  <p>The “pk” column declares that your row key is a VARCHAR (i.e. a 
string) while the “f1”.val column declares that your HBase table will 
contain KeyValues with a column family and column qualifier of “f1”:VAL and 
that their value will be a VARCHAR.</p> 
+  <p>Note that you don’t need the double quotes if you create your HBase 
table with all caps names (since this is how Phoenix normalizes strings, by 
upper casing them). For example, with:</p> 
+  <p><tt>create 'T1', {NAME =&gt; 'F1', VERSIONS =&gt; 5}</tt></p> 
+  <p>you could create this Phoenix view:</p> 
+  <p><tt>CREATE VIEW t1 ( pk VARCHAR PRIMARY KEY, f1.val VARCHAR )</tt></p> 
+  <p>Or if you’re creating new HBase tables, just let Phoenix do everything 
for you like this (No need to use the HBase shell at all.):</p> 
+  <p><tt>CREATE TABLE t1 ( pk VARCHAR PRIMARY KEY, val VARCHAR )</tt></p> 
+ </div> 
+ <div class="section"> 
+  <h3 id="Are_there_any_tips_for_optimizing_Phoenix">Are there any tips for 
optimizing Phoenix?</h3> 
+  <ul> 
+   <li>Use <b>Salting</b> to increase read/write performance Salting can 
significantly increase read/write performance by pre-splitting the data into 
multiple regions. Although Salting will yield better performance in most 
scenarios.</li> 
+  </ul> 
+  <p>Example:</p> 
+  <p><tt>CREATE TABLE TEST (HOST VARCHAR NOT NULL PRIMARY KEY, DESCRIPTION 
VARCHAR) SALT_BUCKETS=16</tt></p> 
+  <p>Note: Ideally for a 16 region server cluster with quad-core CPUs, choose 
salt buckets between 32-64 for optimal performance.</p> 
+  <ul> 
+   <li><b>Per-split</b> table Salting does automatic table splitting but in 
case you want to exactly control where table split occurs with out adding extra 
byte or change row key order then you can pre-split a table.</li> 
+  </ul> 
+  <p>Example: </p> 
+  <p><tt>CREATE TABLE TEST (HOST VARCHAR NOT NULL PRIMARY KEY, DESCRIPTION 
VARCHAR) SPLIT ON ('CS','EU','NA')</tt></p> 
+  <ul> 
+   <li>Use <b>multiple column families</b></li> 
+  </ul> 
+  <p>Column family contains related data in separate files. If you query use 
selected columns then it make sense to group those columns together in a column 
family to improve read performance.</p> 
+  <p>Example:</p> 
+  <p>Following create table DDL will create two column faimiles A and B.</p> 
+  <p><tt>CREATE TABLE TEST (MYKEY VARCHAR NOT NULL PRIMARY KEY, A.COL1 
VARCHAR, A.COL2 VARCHAR, B.COL3 VARCHAR)</tt></p> 
+  <ul> 
+   <li>Use <b>compression</b> On disk compression improves performance on 
large tables</li> 
+  </ul> 
+  <p>Example: </p> 
+  <p><tt>CREATE TABLE TEST (HOST VARCHAR NOT NULL PRIMARY KEY, DESCRIPTION 
VARCHAR) COMPRESSION='GZ'</tt></p> 
+  <ul> 
+   <li> <p>Create <b>indexes</b> See <a 
href="#How_do_I_create_Secondary_Index_on_a_table">#How_do_I_create_Secondary_Index_on_a_table</a></p></li>
 
+   <li> <p><b>Optimize cluster</b> parameters See <a class="externalLink" 
href="http://hbase.apache.org/book/performance.html";>http://hbase.apache.org/book/performance.html</a></p></li>
 
+   <li> <p><b>Optimize Phoenix</b> parameters See <a 
href="tuning.html">tuning.html</a></p></li> 
+  </ul> 
+ </div> 
+ <div class="section"> 
+  <h3 id="How_do_I_create_Secondary_Index_on_a_table">How do I create 
Secondary Index on a table?</h3> 
+  <p>Starting with Phoenix version 2.1, Phoenix supports index over mutable 
and immutable data. Note that Phoenix 2.0.x only supports Index over immutable 
data. Index write performance index with immutable table is slightly faster 
than mutable table however data in immutable table cannot be updated.</p> 
+  <p>Example</p> 
+  <ul> 
+   <li>Create table</li> 
+  </ul> 
+  <p>Immutable table: <tt>create table test (mykey varchar primary key, col1 
varchar, col2 varchar) IMMUTABLE_ROWS=true;</tt></p> 
+  <p>Mutable table: <tt>create table test (mykey varchar primary key, col1 
varchar, col2 varchar);</tt></p> 
+  <ul> 
+   <li>Creating index on col2</li> 
+  </ul> 
+  <p><tt>create index idx on test (col2)</tt></p> 
+  <ul> 
+   <li>Creating index on col1 and a covered index on col2</li> 
+  </ul> 
+  <p><tt>create index idx on test (col1) include (col2)</tt></p> 
+  <p>Upsert rows in this test table and Phoenix query optimizer will choose 
correct index to use. You can see in <a 
href="language/index.html#explain">explain plan</a> if Phoenix is using the 
index table. You can also give a <a href="language/index.html#hint">hint</a> in 
Phoenix query to use a specific index.</p> 
+ </div> 
+ <div class="section"> 
+  <h3 id="Why_isnt_my_secondary_index_being_used">Why isn’t my secondary 
index being used?</h3> 
+  <p>The secondary index won’t be used unless all columns used in the query 
are in it ( as indexed or covered columns). All columns making up the primary 
key of the data table will automatically be included in the index.</p> 
+  <p>Example: DDL <tt>create table usertable (id varchar primary key, 
firstname varchar, lastname varchar); create index idx_name on usertable 
(firstname);</tt></p> 
+  <p>Query: DDL <tt>select id, firstname, lastname from usertable where 
firstname = 'foo';</tt></p> 
+  <p>Index would not be used in this case as lastname is not part of indexed 
or covered column. This can be verified by looking at the explain plan. To fix 
this create index that has either lastname part of index or covered column. 
Example: <tt>create idx_name on usertable (firstname) include 
(lastname);</tt></p> 
+ </div> 
+ <div class="section"> 
+  <h3 id="How_fast_is_Phoenix_Why_is_it_so_fast">How fast is Phoenix? Why is 
it so fast?</h3> 
+  <p>Phoenix is fast. Full table scan of 100M rows usually completes in 20 
seconds (narrow table on a medium sized cluster). This time come down to few 
milliseconds if query contains filter on key columns. For filters on non-key 
columns or non-leading key columns, you can add index on these columns which 
leads to performance equivalent to filtering on key column by making copy of 
table with indexed column(s) part of key.</p> 
+  <p>Why is Phoenix fast even when doing full scan:</p> 
+  <ol style="list-style-type: decimal"> 
+   <li>Phoenix chunks up your query using the region boundaries and runs them 
in parallel on the client using a configurable number of threads</li> 
+   <li>The aggregation will be done in a coprocessor on the server-side, 
collapsing the amount of data that gets returned back to the client rather than 
returning it all.</li> 
+  </ol> 
+ </div> 
+ <div class="section"> 
+  <h3 id="How_do_I_connect_to_secure_HBase_cluster">How do I connect to secure 
HBase cluster?</h3> 
+  <p>Check out excellent post by Anil Gupta <a class="externalLink" 
href="http://bigdatanoob.blogspot.com/2013/09/connect-phoenix-to-secure-hbase-cluster.html";>http://bigdatanoob.blogspot.com/2013/09/connect-phoenix-to-secure-hbase-cluster.html</a></p>
 
+ </div> 
+ <div class="section"> 
+  <h3 id="How_do_I_connect_with_HBase_running_on_Hadoop-2">How do I connect 
with HBase running on Hadoop-2?</h3> 
+  <p>Hadoop-2 profile exists in Phoenix pom.xml. </p> 
+ </div> 
+ <div class="section"> 
+  <h3 
id="Can_phoenix_work_on_tables_with_arbitrary_timestamp_as_flexible_as_HBase_API">Can
 phoenix work on tables with arbitrary timestamp as flexible as HBase API?</h3> 
+  <p>By default, Phoenix let’s HBase manage the timestamps and just shows 
you the latest values for everything. However, Phoenix also allows arbitrary 
timestamps to be supplied by the user. To do that you’d specify a 
“CurrentSCN” at connection time, like this:</p> 
+  <div class="source"> 
+   <pre>Properties props = new Properties();
+props.setProperty(&quot;CurrentSCN&quot;, Long.toString(ts));
+Connection conn = DriverManager.connect(myUrl, props);
+
+conn.createStatement().execute(&quot;UPSERT INTO myTable VALUES ('a')&quot;);
+conn.commit();
+</pre> 
+  </div> 
+  <p>The above is equivalent to doing this with the HBase API:</p> 
+  <div class="source"> 
+   <pre>myTable.put(Bytes.toBytes('a'),ts);
+</pre> 
+  </div> 
+  <p>By specifying a CurrentSCN, you’re telling Phoenix that you want 
everything for that connection to be done at that timestamp. Note that this 
applies to queries done on the connection as well - for example, a query over 
myTable above would not see the data it just upserted, since it only sees data 
that was created before its CurrentSCN property. This provides a way of doing 
snapshot, flashback, or point-in-time queries.</p> 
+  <p>Keep in mind that creating a new connection is <i>not</i> an expensive 
operation. The same underlying HConnection is used for all connections to the 
same cluster, so it’s more or less like instantiating a few objects.</p> 
+ </div> 
+ <div class="section"> 
+  <h3 id="Why_isnt_my_query_doing_a_RANGE_SCAN">Why isn’t my query doing a 
RANGE SCAN?</h3> 
+  <p><tt>DDL: CREATE TABLE TEST (pk1 char(1) not null, pk2 char(1) not null, 
pk3 char(1) not null, non-pk varchar CONSTRAINT PK PRIMARY KEY(pk1, pk2, 
pk3));</tt></p> 
+  <p>RANGE SCAN means that only a subset of the rows in your table will be 
scanned over. This occurs if you use one or more leading columns from your 
primary key constraint. Query that is not filtering on leading PK columns ex. 
<tt>select * from test where pk2='x' and pk3='y';</tt> will result in full scan 
whereas the following query will result in range scan <tt>select * from test 
where pk1='x' and pk2='y';</tt>. Note that you can add a secondary index on 
your “pk2” and “pk3” columns and that would cause a range scan to be 
done for the first query (over the index table).</p> 
+  <p>DEGENERATE SCAN means that a query can’t possibly return any rows. If 
we can determine that at compile time, then we don’t bother to even run the 
scan.</p> 
+  <p>FULL SCAN means that all rows of the table will be scanned over 
(potentially with a filter applied if you have a WHERE clause)</p> 
+  <p>SKIP SCAN means that either a subset or all rows in your table will be 
scanned over, however it will skip large groups of rows depending on the 
conditions in your filter. See <a class="externalLink" 
href="http://phoenix-hbase.blogspot.com/2013/05/demystifying-skip-scan-in-phoenix.html";>this</a>
 blog for more detail. We don’t do a SKIP SCAN if you have no filter on the 
leading primary key columns, but you can force a SKIP SCAN by using the /<i>+ 
SKIP_SCAN </i>/ hint. Under some conditions, namely when the cardinality of 
your leading primary key columns is low, it will be more efficient than a FULL 
SCAN.</p> 
+ </div> 
+ <div class="section"> 
+  <h3 id="Should_I_pool_Phoenix_JDBC_Connections">Should I pool Phoenix JDBC 
Connections?</h3> 
+  <p>No, it is not necessary to pool Phoenix JDBC Connections.</p> 
+  <p>Phoenix’s Connection objects are different from most other JDBC 
Connections due to the underlying HBase connection. The Phoenix Connection 
object is designed to be a thin object that is inexpensive to create. If 
Phoenix Connections are reused, it is possible that the underlying HBase 
connection is not always left in a healthy state by the previous user. It is 
better to create new Phoenix Connections to ensure that you avoid any potential 
issues.</p> 
+  <p>Implementing pooling for Phoenix could be done simply by creating a 
delegate Connection that instantiates a new Phoenix connection when retrieved 
from the pool and then closes the connection when returning it to the pool (see 
<a class="externalLink" 
href="https://issues.apache.org/jira/browse/PHOENIX-2388";>PHOENIX-2388</a>).</p>
 
+ </div> 
+ <div class="section"> 
+  <h3 id="Why_empty_key_value">Why does Phoenix add an empty/dummy KeyValue 
when doing an upsert?<a 
name="Why_does_Phoenix_add_an_emptydummy_KeyValue_when_doing_an_upsert"></a></h3>
 
+  <p>The empty or dummy KeyValue (with a column qualifier of _0) is needed to 
ensure that a given column is available for all rows.</p> 
+  <p>As you may know, data is stored in HBase as KeyValues, meaning that the 
full row key is stored for each column value. This also implies that the row 
key is not stored at all unless there is at least one column stored.</p> 
+  <p>Now consider JDBC row which has an integer primary key, and several 
columns which are all null. In order to be able to store the primary key, a 
KeyValue needs to be stored to show that the row is present at all. This column 
is represented by the empty column that you’ve noticed. This allows doing a 
“SELECT * FROM TABLE” and receiving records for all rows, even those whose 
non-pk columns are null.</p> 
+  <p>The same issue comes up even if only one column is null for some (or all) 
records. A scan over Phoenix will include the empty column to ensure that rows 
that only consist of the primary key (and have null for all non-key columns) 
will be included in a scan result.</p> 
+ </div> 
+</div>
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Modified: phoenix/site/publish/language/datatypes.html
URL: 
http://svn.apache.org/viewvc/phoenix/site/publish/language/datatypes.html?rev=1872559&r1=1872558&r2=1872559&view=diff
==============================================================================
--- phoenix/site/publish/language/datatypes.html (original)
+++ phoenix/site/publish/language/datatypes.html Thu Jan  9 16:46:20 2020
@@ -1,7 +1,7 @@
 
 <!DOCTYPE html>
 <!--
- Generated by Apache Maven Doxia at 2020-01-07
+ Generated by Apache Maven Doxia at 2020-01-09
  Rendered using Reflow Maven Skin 1.1.0 
(http://andriusvelykis.github.io/reflow-maven-skin)
 -->
 <html  xml:lang="en" lang="en">

Modified: phoenix/site/publish/language/functions.html
URL: 
http://svn.apache.org/viewvc/phoenix/site/publish/language/functions.html?rev=1872559&r1=1872558&r2=1872559&view=diff
==============================================================================
--- phoenix/site/publish/language/functions.html (original)
+++ phoenix/site/publish/language/functions.html Thu Jan  9 16:46:20 2020
@@ -1,7 +1,7 @@
 
 <!DOCTYPE html>
 <!--
- Generated by Apache Maven Doxia at 2020-01-07
+ Generated by Apache Maven Doxia at 2020-01-09
  Rendered using Reflow Maven Skin 1.1.0 
(http://andriusvelykis.github.io/reflow-maven-skin)
 -->
 <html  xml:lang="en" lang="en">

Modified: phoenix/site/publish/language/index.html
URL: 
http://svn.apache.org/viewvc/phoenix/site/publish/language/index.html?rev=1872559&r1=1872558&r2=1872559&view=diff
==============================================================================
--- phoenix/site/publish/language/index.html (original)
+++ phoenix/site/publish/language/index.html Thu Jan  9 16:46:20 2020
@@ -1,7 +1,7 @@
 
 <!DOCTYPE html>
 <!--
- Generated by Apache Maven Doxia at 2020-01-07
+ Generated by Apache Maven Doxia at 2020-01-09
  Rendered using Reflow Maven Skin 1.1.0 
(http://andriusvelykis.github.io/reflow-maven-skin)
 -->
 <html  xml:lang="en" lang="en">

Modified: phoenix/site/source/src/site/markdown/faq.md
URL: 
http://svn.apache.org/viewvc/phoenix/site/source/src/site/markdown/faq.md?rev=1872559&r1=1872558&r2=1872559&view=diff
==============================================================================
--- phoenix/site/source/src/site/markdown/faq.md (original)
+++ phoenix/site/source/src/site/markdown/faq.md Thu Jan  9 16:46:20 2020
@@ -222,7 +222,7 @@ Example:
 ` CREATE TABLE TEST (HOST VARCHAR NOT NULL PRIMARY KEY, DESCRIPTION VARCHAR) 
COMPRESSION='GZ'`
 
 * Create **indexes**
-See 
[faq.html#/How_do_I_create_Secondary_Index_on_a_table](faq.html#/How_do_I_create_Secondary_Index_on_a_table)
+See 
[#How_do_I_create_Secondary_Index_on_a_table](#How_do_I_create_Secondary_Index_on_a_table)
 
 * **Optimize cluster** parameters
 See http://hbase.apache.org/book/performance.html


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