Alexander Elgert wrote:
Hello,

given is a postgres database in version
------------------------------------------------------------------------
PostgreSQL 7.4.8 on i686-pc-linux-gnu, compiled by GCC gcc (GCC) 3.2.2

Upgrade to 7.4.16 as soon as is convenient - you're missing 8 sets of bug-fixes.

and there is a table "visit" with 26 million tuples using 8 GB of space

The table is from ofbiz and for logging accesses to the webapplication.
Running a delete command which deletes all but a few tuples causes the postmaster to allocate memory: --- 10903 postgres 25 0 214M 213M 10412 R 95.3 10.5 6:07 postmaster

Until all memory and swap is gone - that was 1.4GB of top:SIZE

Do you have any triggers or foreign keys on this table? If so, each of those will need to be tracked. There may be a memory-leak in 7.4.8 that's since been fixed, probably worth checking the release notes at the end of the manual.

--
  Richard Huxton
  Archonet Ltd

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