pg_autovacuum reltuples bug

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От Jim C. Nasby
Тема pg_autovacuum reltuples bug
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Msg-id 20040427190529.GL41429@nasby.net
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Ответы Re: pg_autovacuum reltuples bug  ("Matthew T. O'Connor" <matthew@zeut.net>)
Список pgsql-bugs
There's a bug in pg_autovacuum that makes it vacuum large tables way to
frequently.

ogr=# select reltuples from pg_class where relname='ogr_summary';
  reltuples
-------------
 2.64411e+07
(1 row)

[2004-04-27 02:03:08 PM]   table name:     ogr."public"."ogr_results"
[2004-04-27 02:03:08 PM]      relid: 615097;   relisshared: 0
[2004-04-27 02:03:08 PM]      reltuples: 7;  relpages: 519951
[2004-04-27 02:03:08 PM]      curr_analyze_count:  9904180; cur_delete_count:   168282
[2004-04-27 02:03:08 PM]      ins_at_last_analyze: 9904180; del_at_last_vacuum: 168282
[2004-04-27 02:03:08 PM]      insert_threshold:    507; delete_threshold    1014
[2004-04-27 02:03:08 PM] added table: ogr."public"."ogr_results"

I suspect the issue is on line 121:
    new_tbl->reltuples = atoi(PQgetvalue(res, row, PQfnumber(res, "reltuples")));

I'm not a C coder, but doesn't atoi just take a text value and convert
it to an int? Shouldn't all the stats counters be stored as reals?
--
Jim C. Nasby, Database Consultant                  jim@nasby.net
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