From: | Graham Leggett <minfrin(at)sharp(dot)fm> |
---|---|
To: | pgsql-jdbc(at)postgresql(dot)org |
Subject: | Picking up strange queries for "pg_catalog" |
Date: | 2010-07-04 11:13:49 |
Message-ID: | D1BEEF82-02F2-4CFD-BBD3-EA0AFFA0AFF8@sharp.fm |
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Thread: | |
Lists: | pgsql-jdbc |
Hi all,
While investigating some performance issues with a database, I have
been analysing the database queries, and have discovered that I am
getting thousands and thousands of queries that look like the ones
below.
Asking on the pgsql-general list, I was pointed in the direction of
the jdbc driver, which in theory is making these queries, but not
caching them.
Does this look familiar to anybody?
In addition to this, I am using the atomikos XA transaction manager,
could this be the source of these queries?
Is there anything I can do to stop these queries being made?
2010-07-03 23:49:31 SAST LOG: execute <unnamed>: SELECT attnotnull
FROM pg_catalog.pg_attribute WHERE attrelid = $1 AND attnum = $2
2010-07-03 23:49:31 SAST DETAIL: parameters: $1 = '29427', $2 = '4'
2010-07-03 23:49:31 SAST LOG: execute <unnamed>: SELECT def.adsrc
FROM pg_catalog.pg_class c JOIN pg_catalog.pg_attribute a ON
(a.attrelid=c.oid) LEFT JOIN pg_catalog.pg_attrdef def ON
(a.attrelid=def.adrelid AND a.attnum = def.adnum) WHERE c.oid = $1 and
a.attnum = $2 AND def.adsrc LIKE '%nextval(%'
2010-07-03 23:49:31 SAST DETAIL: parameters: $1 = '29427', $2 = '4'
2010-07-03 23:49:31 SAST LOG: execute <unnamed>: SELECT attnotnull
FROM pg_catalog.pg_attribute WHERE attrelid = $1 AND attnum = $2
2010-07-03 23:49:31 SAST DETAIL: parameters: $1 = '29427', $2 = '5'
2010-07-03 23:49:31 SAST LOG: execute <unnamed>: SELECT def.adsrc
FROM pg_catalog.pg_class c JOIN pg_catalog.pg_attribute a ON
(a.attrelid=c.oid) LEFT JOIN pg_catalog.pg_attrdef def ON
(a.attrelid=def.adrelid AND a.attnum = def.adnum) WHERE c.oid = $1 and
a.attnum = $2 AND def.adsrc LIKE '%nextval(%'
2010-07-03 23:49:31 SAST DETAIL: parameters: $1 = '29427', $2 = '5'
2010-07-03 23:49:31 SAST LOG: execute <unnamed>: SELECT attnotnull
FROM pg_catalog.pg_attribute WHERE attrelid = $1 AND attnum = $2
2010-07-03 23:49:31 SAST DETAIL: parameters: $1 = '29427', $2 = '8'
2010-07-03 23:49:31 SAST LOG: execute <unnamed>: SELECT def.adsrc
FROM pg_catalog.pg_class c JOIN pg_catalog.pg_attribute a ON
(a.attrelid=c.oid) LEFT JOIN pg_catalog.pg_attrdef def ON
(a.attrelid=def.adrelid AND a.attnum = def.adnum) WHERE c.oid = $1 and
a.attnum = $2 AND def.adsrc LIKE '%nextval(%'
2010-07-03 23:49:31 SAST DETAIL: parameters: $1 = '29427', $2 = '8'
2010-07-03 23:49:31 SAST LOG: execute <unnamed>: SELECT attnotnull
FROM pg_catalog.pg_attribute WHERE attrelid = $1 AND attnum = $2
2010-07-03 23:49:31 SAST DETAIL: parameters: $1 = '29427', $2 = '9'
2010-07-03 23:49:31 SAST LOG: execute <unnamed>: SELECT def.adsrc
FROM pg_catalog.pg_class c JOIN pg_catalog.pg_attribute a ON
(a.attrelid=c.oid) LEFT JOIN pg_catalog.pg_attrdef def ON
(a.attrelid=def.adrelid AND a.attnum = def.adnum) WHERE c.oid = $1 and
a.attnum = $2 AND def.adsrc LIKE '%nextval(%'
2010-07-03 23:49:31 SAST DETAIL: parameters: $1 = '29427', $2 = '9'
2010-07-03 23:49:31 SAST LOG: execute <unnamed>: SELECT attnotnull
FROM pg_catalog.pg_attribute WHERE attrelid = $1 AND attnum = $2
2010-07-03 23:49:31 SAST DETAIL: parameters: $1 = '29427', $2 = '7'
2010-07-03 23:49:31 SAST LOG: execute <unnamed>: SELECT def.adsrc
FROM pg_catalog.pg_class c JOIN pg_catalog.pg_attribute a ON
(a.attrelid=c.oid) LEFT JOIN pg_catalog.pg_attrdef def ON
(a.attrelid=def.adrelid AND a.attnum = def.adnum) WHERE c.oid = $1 and
a.attnum = $2 AND def.adsrc LIKE '%nextval(%'
2010-07-03 23:49:31 SAST DETAIL: parameters: $1 = '29427', $2 = '7'
2010-07-03 23:49:31 SAST LOG: execute <unnamed>: SELECT attnotnull
FROM pg_catalog.pg_attribute WHERE attrelid = $1 AND attnum = $2
2010-07-03 23:49:31 SAST DETAIL: parameters: $1 = '29427', $2 = '10'
2010-07-03 23:49:31 SAST LOG: execute <unnamed>: SELECT def.adsrc
FROM pg_catalog.pg_class c JOIN pg_catalog.pg_attribute a ON
(a.attrelid=c.oid) LEFT JOIN pg_catalog.pg_attrdef def ON
(a.attrelid=def.adrelid AND a.attnum = def.adnum) WHERE c.oid = $1 and
a.attnum = $2 AND def.adsrc LIKE '%nextval(%'
2010-07-03 23:49:31 SAST DETAIL: parameters: $1 = '29427', $2 = '10'
2010-07-03 23:49:31 SAST LOG: execute <unnamed>: SELECT attnotnull
FROM pg_catalog.pg_attribute WHERE attrelid = $1 AND attnum = $2
2010-07-03 23:49:31 SAST DETAIL: parameters: $1 = '29427', $2 = '6'
2010-07-03 23:49:31 SAST LOG: execute <unnamed>: SELECT def.adsrc
FROM pg_catalog.pg_class c JOIN pg_catalog.pg_attribute a ON
(a.attrelid=c.oid) LEFT JOIN pg_catalog.pg_attrdef def ON
(a.attrelid=def.adrelid AND a.attnum = def.adnum) WHERE c.oid = $1 and
a.attnum = $2 AND def.adsrc LIKE '%nextval(%'
2010-07-03 23:49:31 SAST DETAIL: parameters: $1 = '29427', $2 = '6'
Regards,
Graham
--
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