Bugs item #1010758, was opened at 2010-01-28 18:41
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Category: None
Group: None
Status: Open
Resolution: None
Priority: 3
Submitted By: Florian Nigsch (fnigsch)
Assigned to: Nobody (None)
Summary: Potential memory leak with savepoints and cursors
Initial Comment:
Problem: When executing a large number (100,000s) of queries the server eventually exhausts available memory and
crashes.
Likely cause: Problem with the release of savepoints; as seen in the PostgreSQL logs below, a savepoint is always
createdimmediately before the cursor is closed, and this savepoint is then released once the cursor is closed.
Shouldn'tthe savepoint be released before the enclosing cursor is closed? The logs below show that the savepoint
creation/releaseis not enclosed by the cursor creation/destruction.
psqlODBC driver used: psqlodbc_08_04_0100.zip
PostgreSQL server: 8.4.0
LOG: statement: BEGIN;declare "SQL_CUR05898D98" cursor with hold for select * from ...;fetch 100 in "SQL_CUR05898D98"
LOG: statement: declare "SQL_CUR0589C5B0" cursor for select n.nspname, c.relname, a.attname, a.atttypid, t.typname,
a.attnum,a.attlen, a.atttypmod, a.attnotnull, c.relhasrules, c.relkind, c.
oid, d.adsrc, case t.typtype when 'd' then t.typbasetype else 0 end, t.typtypmod from (((pg_catalog.pg_class c inner
joinpg_catalog.pg_namespace n on n.oid = c.relnamespace and c.oid = 632801
8) inner join pg_catalog.pg_attribute a on (not a.attisdropped) and a.attnum > 0 and a.attrelid = c.oid) inner join
pg_catalog.pg_typet on t.oid = a.atttypid) left outer join pg_attrdef d on
a.atthasdef and d.adrelid = a.attrelid and d.adnum = a.attnum order by n.nspname, c.relname, attnum;fetch 100 in
"SQL_CUR0589C5B0"
LOG: statement: SAVEPOINT _per_query_svp_;close "SQL_CUR0589C5B0";RELEASE _per_query_svp_
LOG: statement: SAVEPOINT _per_query_svp_;close "SQL_CUR05898D98";RELEASE _per_query_svp_
LOG: statement: declare "SQL_CUR05898D98" cursor with hold for select * from ...;fetch 100 in "SQL_CUR05898D98"
LOG: statement: SAVEPOINT _per_query_svp_;close "SQL_CUR05898D98";RELEASE _per_query_svp_
LOG: statement: declare "SQL_CUR05898D98" cursor with hold for select * from ...;fetch 100 in "SQL_CUR05898D98"
LOG: statement: SAVEPOINT _per_query_svp_;close "SQL_CUR05898D98";RELEASE _per_query_svp_
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