Re: Variable constants ?
On 2019-08-15 23:27, Rich Shepard wrote: On Thu, 15 Aug 2019, stan wrote: I need to put a few bossiness constants, such as a labor rate multiplier in an application. I am adverse to hard coding these things. The best plan i have come up with so far is to store them in a table, which would have only 1 row, and a column for each needed constant. Anyone have a better way to do this? Failing a better way is there some way I can limit this table to only allow one row to exist? Stan, I've resolved similar issues with changing regulatory agency staff. For your application(s) I suggest a table like this: create table labor_rate_mult ( rate real primary_key, start_datedate not null, end_date date ) This provides both a history of labor rate multipliers and the ability to select either the most current one or a previous one. If other factors affect the rate, add attribute columns for them. Regards, Rich Another way to keep a history is using a daterange instead of two columns for start and end date. Something like create table labor_rate_mult ( rate real primary_key, validity daterange not null ) This makes it easier to manage and avoid e.g. overlappings. Regards Charles
Re: Error XX000 After pg11 upgrade
Simon Windsor writes: > Since then, large bulk inserts of configuration changes are failing with > this Error, but adhoc and small changes are working ok. Might it be that things work as long as the trigger is only tasked with redirecting to the same child table (or limited set of child tables) within a particular insertion command? I'm wondering if this could be related to bug #15913 --- which I just fixed today, so maybe I just have it on the brain too much. The manifestation doesn't look quite the same, but given the way your trigger is written, something about NEW.* changing type from one call to the next might have something to do with it. I also wonder how often you create/delete child tables. regards, tom lane
Re: Error XX000 After pg11 upgrade
On 16/08/2019 04:35, Simon Windsor wrote: Hi The Full system used to in an Oracle DB and was ported to Postgres 9.5 about 2+ years ago, and partitioned using inheritance tables. Since then pg_upgrade has been used to upgrade to pg10 (with apt upgrade to take to 10.5 occasionally). Last week, pg_upgrade was againn used to upgrade to pg11.4. Since then, large bulk inserts of configuration changes are failing with this Error, but adhoc and small changes are working ok. The actual error is reported by a Java process Caused by: org.postgresql.util.PSQLException: ERROR: cache lookup failed for type 22079 Where: SQL statement "insert into configObjectsFull_2019 values (new.*)" PL/pgSQL function configobjectsfull_insert_trigger() line 28 at SQL statement at org.postgresql.core.v3.QueryExecutorImpl.receiveErrorResponse(QueryExecutorImpl.java:2310) at The DB Tableand Trigger are attached. As you can see, the id and timestamp are set on insert, and are used to determine the partition used. This issue started after the upgrade to pg11, pg10 and pg9 had no problems. Any ideas would be appreciated. [...] Probably will make no difference, but have you considered testing using pg 11.5? It would at least rule out a lot of Red Herrings! Cheers, Gavin
RE: Variable constants ?
-Original Message- From: Tom Lane Sent: Thursday, August 15, 2019 6:13 PM To: stan Cc: pgsql-gene...@postgresql.org Subject: Re: Variable constants ? stan writes: > Failing a better way is there some way I can limit this table to only > allow one row to exist? I was recently reminded of a cute trick for that: make a unique index on a constant. regression=# create table consts(f1 int, f2 int); CREATE TABLE regression=# create unique index consts_only_one on consts((1)); CREATE INDEX regression=# insert into consts values(1,2); INSERT 0 1 regression=# insert into consts values(3,4); ERROR: duplicate key value violates unique constraint "consts_only_one" DETAIL: Key ((1))=(1) already exists. Shepard's nearby advice about keeping some history is probably a better plan though. regards, tom lane Here is another trick to keep a table to just one row: reg#create table test(c1 int check(c1=1) default 1, c2 int); CREATE TABLE reg#create unique index one_row on test(c1); CREATE INDEX reg#insert into test (c2) values(3); INSERT 01 reg# insert into test (c2) values(4); ERROR: duplicate key value violates unique constraint "one_row" DETAIL: Key (c1)=(1) already exists. SQL state: 23505 Regards, Igor Neyman
Re: Variable constants ?
stan writes: > Failing a better way is there some way I can limit this table to only allow > one row to exist? I was recently reminded of a cute trick for that: make a unique index on a constant. regression=# create table consts(f1 int, f2 int); CREATE TABLE regression=# create unique index consts_only_one on consts((1)); CREATE INDEX regression=# insert into consts values(1,2); INSERT 0 1 regression=# insert into consts values(3,4); ERROR: duplicate key value violates unique constraint "consts_only_one" DETAIL: Key ((1))=(1) already exists. Shepard's nearby advice about keeping some history is probably a better plan though. regards, tom lane
Re: Variable constants ?
On Thu, 15 Aug 2019, stan wrote: I need to put a few bossiness constants, such as a labor rate multiplier in an application. I am adverse to hard coding these things. The best plan i have come up with so far is to store them in a table, which would have only 1 row, and a column for each needed constant. Anyone have a better way to do this? Failing a better way is there some way I can limit this table to only allow one row to exist? Stan, I've resolved similar issues with changing regulatory agency staff. For your application(s) I suggest a table like this: create table labor_rate_mult ( rate real primary_key, start_datedate not null, end_date date ) This provides both a history of labor rate multipliers and the ability to select either the most current one or a previous one. If other factors affect the rate, add attribute columns for them. Regards, Rich
Re: Variable constants ?
On 8/15/19 1:56 PM, stan wrote: I need to put a few bossiness constants, such as a labor rate multiplier in an application. I am adverse to hard coding these things. The best plan i have come up with so far is to store them in a table, which would have only 1 row, and a column for each needed constant. Anyone have a better way to do this? Another way(better in eye of beholder) a conf file that can be written to. Failing a better way is there some way I can limit this table to only allow one row to exist? Yes add the row and REVOKE INSERT afterwards. Then you have a single row that can be updated/deleted(though you could revoke that also). -- Adrian Klaver adrian.kla...@aklaver.com
Variable constants ?
I need to put a few bossiness constants, such as a labor rate multiplier in an application. I am adverse to hard coding these things. The best plan i have come up with so far is to store them in a table, which would have only 1 row, and a column for each needed constant. Anyone have a better way to do this? Failing a better way is there some way I can limit this table to only allow one row to exist? -- "They that would give up essential liberty for temporary safety deserve neither liberty nor safety." -- Benjamin Franklin
Re: slow queries on system tables
On 8/15/19 12:09 PM, PegoraroF10 wrote: last values for autovacuum and autoanalyse are Null. Thanks, I´ll change and see if that solve our problem I thought we had been down this trail before: https://www.postgresql.org/message-id/1564168884421-0.post%40n3.nabble.com -- Sent from: https://www.postgresql-archive.org/PostgreSQL-general-f1843780.html -- Adrian Klaver adrian.kla...@aklaver.com
Re: slow queries on system tables
last values for autovacuum and autoanalyse are Null. Thanks, I´ll change and see if that solve our problem -- Sent from: https://www.postgresql-archive.org/PostgreSQL-general-f1843780.html
Re: slow queries on system tables
Are you autovacuuming and analyzing aggressively enough? Is there bloat or other concern for these system tables? I expect it may be a concern based on what I remember about your environment having thousands of tables and perhaps autovacuum not keeping up (re: Too slow to create new schema and their tables, functions, triggers). Can you check results for last (auto)vacuum and analyze? select * from pg_stat_all_tables where relname IN( 'pg_class', 'pg_attribute', 'pg_index' );
Re: Error XX000 After pg11 upgrade
Hi The Full system used to in an Oracle DB and was ported to Postgres 9.5 about 2+ years ago, and partitioned using inheritance tables. Since then pg_upgrade has been used to upgrade to pg10 (with apt upgrade to take to 10.5 occasionally). Last week, pg_upgrade was againn used to upgrade to pg11.4. Since then, large bulk inserts of configuration changes are failing with this Error, but adhoc and small changes are working ok. The actual error is reported by a Java process Caused by: org.postgresql.util.PSQLException: ERROR: cache lookup failed for type 22079 Where: SQL statement "insert into configObjectsFull_2019 values (new.*)" PL/pgSQL function configobjectsfull_insert_trigger() line 28 at SQL statement at org.postgresql.core.v3.QueryExecutorImpl.receiveErrorResponse(QueryExecutorImpl.java:2310) at The DB Tableand Trigger are attached. As you can see, the id and timestamp are set on insert, and are used to determine the partition used. This issue started after the upgrade to pg11, pg10 and pg9 had no problems. Any ideas would be appreciated. Simon On 15/08/2019 16:31, Tom Lane wrote: Simon Windsor writes: I have just upgraded a Db from pg 10.5 to pg11.4 and almost immediately we are seeing errors like ERROR,XX000,"cache lookup failed for type 22079" When inserting into a a partitioned table. About 30% of inserts are reporting this error. Hmm ... can you show the full schema (eg, psql \d+ output) for the partitioned table and its children? Is there any pattern to the failing inserts, eg do they all resolve as inserts to the same partition(s)? ... And an insert trigger uses the current date to dertmine where the object is stored. In other words, this isn't actual partitioning as introduced in v10, but a hand-rolled equivalent? How do I determine what type 22079 refers to? Presumably, the problem is that that type OID *doesn't* refer to anything any more. You should be asking "where is this dangling reference coming from?". It's possibly hiding in the partitioning expression(s) of this partitioned table, but there's no way to tell with this amount of info. How did you do the upgrade exactly? regards, tom lane -- Simon Windsor Eml: simon.wind...@cornfield.me.uk Tel: 01454 617689 Mob: 0755 197 9733 “There is nothing in the world that some man cannot make a little worse and sell a little cheaper, and he who considers price only is that man's lawful prey.” objects.sql Description: application/sql
slow queries on system tables
The driver I´m using does some queries on system tables and obviously I cannot change them because are driver inside. These two queries are usually fast, but sometimes they take 8 or 15 times more to run. The question is, can I change something on these tables ? Can i create an index, can I load them into cache ? What can I do to speed up if I cannot change the way these queries are written ? Extracted from pg_stat_statements: Query 1 - calls: 20 times, min_time ~ 20ms, mean_time ~ 50ms, max_time ~ 480ms SELECT current_database() AS TABLE_CATALOG, n.nspname AS TABLE_SCHEMA, t.relname AS TABLE_NAME, t.oid AS TABLE_OID, current_database() AS INDEX_CATALOG, n.nspname AS INDEX_SCHEMA, c.relname AS INDEX_NAME, c.oid AS INDEX_OID, a.attname AS COLUMN_NAME, a.attnum AS COLUMN_POSITION,indoption[index] & $1 AS DESCENDING , indisunique::integer AS UNIQUE FROM (SELECT generate_series($2, indnatts - $3), indrelid, indexrelid, indkey, indoption, indisunique, indisprimary FROM pg_index i) i(index, indrelid, indexrelid, indkey, indoption, indisunique, indisprimary) INNER JOIN pg_class c ON c.oid = indexrelid INNER JOIN pg_class t ON t.oid = indrelid INNER JOIN pg_namespace n ON n.oid = t.relnamespace INNER JOIN pg_attribute a ON a.attrelid = indrelid AND a.attnum = indkey[index] WHERE n.nspname LIKE $4 AND t.relname LIKE $5 ORDER BY indisprimary::integer DESC, n.nspname, t.relname, c.relname, a.attnum Query 1 - calls: 2 times, min_time ~ 70ms, mean_time ~ 95ms, max_time ~ 170ms. SELECT pg_attribute.attname FROM pg_index, pg_class, pg_attribute WHERE upper(pg_class.relname) = $1 AND indrelid = pg_class.oid AND pg_attribute.attrelid = pg_class.oidAND pg_attribute.attnum = any(pg_index.indkey) AND indisprimary -- Sent from: https://www.postgresql-archive.org/PostgreSQL-general-f1843780.html
Error XX000 After pg11 upgrade
Hi I have just upgraded a Db from pg 10.5 to pg11.4 and almost immediately we are seeing errors like ERROR,XX000,"cache lookup failed for type 22079" When inserting into a a partitioned table. About 30% of inserts are reporting this error. How do I determine what type 22079 refers to? I have checked pg_attributes and pg_classes without success? What would be causing this error? The basic table layout is objects objects_2010 objects_2011 - objects_2018 objects_2019 And an insert trigger uses the current date to dertmine where the object is stored. Any ideas or suggestions would be appreciated. Simon -- Simon Simon Windsor Eml: simon.wind...@cornfield.org.uk Tel: 01454 617689 Mob: 07960 321599
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