Re: PG9.2.3. Query hanging: SELECT count(*) FROM pg_catalog.pg_class... - Mailing list pgsql-general
| From | René Romero Benavides |
|---|---|
| Subject | Re: PG9.2.3. Query hanging: SELECT count(*) FROM pg_catalog.pg_class... |
| Date | |
| Msg-id | 13216496.c4H3PjGDAg@beagle Whole thread Raw |
| In response to | PG9.2.3. Query hanging: SELECT count(*) FROM pg_catalog.pg_class... (David Kerr <dmk@mr-paradox.net>) |
| Responses |
Re: PG9.2.3. Query hanging: SELECT count(*) FROM pg_catalog.pg_class...
|
| List | pgsql-general |
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">Ican confirm it comes from pgpool, and is very weird , I guess the pgpool list would be a better fit.<pstyle=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;-qt-user-state:0;">Cheers.<p style="-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px;margin-right:0px; -qt-block-indent:0; text-indent:0px; "> <p style=" margin-top:0px; margin-bottom:0px; margin-left:0px;margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">On Friday, February 15, 2013 01:58:55PM David Kerr wrote:<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0;text-indent:0px; -qt-user-state:0;">> Howdy!<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px;margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">> <p style=" margin-top:0px;margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">>This query is coming from PgPool I believe.<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px;margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">> <p style=" margin-top:0px;margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">>SELECT count(*) FROM pg_catalog.pg_class AS c WHERE c.relname =<p style=" margin-top:0px; margin-bottom:0px;margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">> 'import_jobs'AND c.relpersistence = 'u'<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0;text-indent:0px; -qt-user-state:0;">> <p style=" margin-top:0px; margin-bottom:0px; margin-left:0px;margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">> This is a very small database,like 10/15 tables, it's basically empty.<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px;-qt-block-indent:0; text-indent:0px; -qt-user-state:0;">> If i run this query manually, it comes backimmediatly.<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;-qt-user-state:0;">> However according to this it's been running for about an hour.<p style=" margin-top:0px;margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">><p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0;text-indent:0px; -qt-user-state:0;">> v3=# select now();<p style=" margin-top:0px; margin-bottom:0px;margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">> now<p style="margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">>-------------------------------<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px;-qt-block-indent:0; text-indent:0px; -qt-user-state:0;">> 2013-02-15 21:49:34.470466+00<p style=" margin-top:0px;margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">>(1 row)<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0;text-indent:0px; -qt-user-state:0;">> <p style=" margin-top:0px; margin-bottom:0px; margin-left:0px;margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">> -[ RECORD 5<p style=" margin-top:0px;margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">>]----+---------------------------------------------------------------------<p style=" margin-top:0px;margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">>------------------------------------ datid | 16389<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px;margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">> datname | v3<p style=" margin-top:0px;margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">>pid | 13905<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0;text-indent:0px; -qt-user-state:0;">> usesysid | 20415<p style=" margin-top:0px; margin-bottom:0px;margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">> usename| workling<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;-qt-user-state:0;">> application_name |<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px;margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">> client_addr | 10.0.0.132<pstyle=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;-qt-user-state:0;">> client_hostname |<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px;-qt-block-indent:0; text-indent:0px; -qt-user-state:0;">> client_port | 58009<p style=" margin-top:0px;margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">>backend_start | 2013-02-15 20:49:09.098768+00<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px;margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">> xact_start | 2013-02-15 20:49:09.189625+00<pstyle=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;-qt-user-state:0;">> query_start | 2013-02-15 20:49:09.198742+00<p style=" margin-top:0px; margin-bottom:0px;margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">> state_change| 2013-02-15 20:49:09.198743+00<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px;-qt-block-indent:0; text-indent:0px; -qt-user-state:0;">> waiting | f<p style=" margin-top:0px; margin-bottom:0px;margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">> state |active<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;-qt-user-state:0;">> query | SELECT count(*) FROM pg_catalog.pg_class AS c WHERE<p style=" margin-top:0px;margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">>c.relname = 'import_jobs' AND c.relpersistence = 'u'<p style=" margin-top:0px; margin-bottom:0px;margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">> <p style="margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">>(I actually restarted the application and now there are 4 of these)<p style=" margin-top:0px; margin-bottom:0px;margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">> <p style="margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">>Any idea why the query would hang like this?<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px;margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">> <p style=" margin-top:0px;margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">>I don't see it waiting on locks or anything like that.<p style=" margin-top:0px; margin-bottom:0px;margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">> <p style="margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">>any ideas?<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0;text-indent:0px; -qt-user-state:0;">> <p style=" margin-top:0px; margin-bottom:0px; margin-left:0px;margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">> Thanks<br />-- <p style="margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">RenéRomero Benavides<span style=" font-family:'liberation sans';"> </span><a href="https://twitter.com/iCodeiExist"><spanstyle=" font-family:'liberation sans'; text-decoration: underline; color:#0057ae;">@iCodeiExist</span></a><a href="https://twitter.com/PgsqlMx"><span style=" text-decoration: underline; color:#0057ae;">@PgsqlMx</span></a><pstyle="-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px;margin-right:0px; -qt-block-indent:0; text-indent:0px; "> <p style=" margin-top:0px; margin-bottom:0px; margin-left:0px;margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">Postgresql Tips en español parala comunidad de México e Hispanoamérica.<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px;-qt-block-indent:0; text-indent:0px; -qt-user-state:0;"><a href="http://postgresql.org.mx"><span style="text-decoration: underline; 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