Picking up strange queries for "pg_catalog" - Mailing list 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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