Re: Application hangs - Mailing list pgsql-admin

El vie, 22-01-2016 a las 09:17 +0530, Ankur Kaushik escribió:
>
> Hi ,
>
> We are facing problem in our Live server , Applications hangs after
> some time
>
> Please Let me know Is this database related or Application ?
>
> Process list shows as below
>
> postgres=# select count(*) from pg_stat_activity ;
>  count
> -------
>     37
> (1 row)
>
>
> "SELECT NULL AS TABLE_CAT" and  "SHOW TRANSACTION ISOLATION LEVEL",
>  Type query increases as
>
>
>
>  16384 | 15011 | idle   | SELECT NULL AS TABLE_CAT, n.nspname AS
> TABLE_SCHEM, c.relname AS TABLE_NAME,  CASE n.nspname ~ '^pg_' OR
> n.nspname = 'information_schema'  WHEN true THEN CASE  WHE
> N n.nspname = 'pg_catalog' OR n.nspname = 'information_schema' THEN
> CASE c.relkind   WHEN 'r' THEN 'SYSTEM TABLE'   WHEN 'v' THEN 'SYSTEM
> VIEW'   WHEN 'i' THEN 'SYSTEM INDEX'   ELSE NULL
> END  WHEN n.nspname = 'pg_toast' THEN CASE c.relkind   WHEN 'r' THEN
> 'SYSTEM TOAST TABLE'   WHEN 'i' THEN 'SYSTEM TOAST INDEX'   ELSE NULL
>   END  ELSE CASE c.relkind   WHEN 'r' THEN 'TEMPOR
> ARY TABLE'   WHEN 'i' THEN 'TEMPORARY INDEX'   WHEN 'S' THEN
> 'TEMPORARY SEQUENCE'   WHEN 'v' THEN 'TEMPORARY VIEW'   ELSE NULL
> END  END  WHEN false THEN CASE c.relkind  WHEN 'r' THEN 'TAB
> LE'  WHEN 'i' THEN 'INDEX'  WHEN 'S' THEN 'SEQUENCE'  WHEN 'v' THEN
> 'VIEW'  WHEN 'c' THEN 'TYPE'  WHEN 'f' THEN 'FOREIGN TABLE'  WHEN 'm'
> THEN 'MATERIALIZED VIEW'  ELSE NULL  END  ELSE NULL
>   END  AS TABLE_TYPE, d.description AS REMARKS  FROM
> pg_catalog.pg_namespace n, pg_catalog.pg_class c  L
>  16384 | 15012 | idle   | SELECT NULL AS TABLE_CAT, n.nspname AS
> TABLE_SCHEM, c.relname AS TABLE_NAME,  CASE n.nspname ~ '^pg_' OR
> n.nspname = 'information_schema'  WHEN true THEN CASE  WHE
> N n.nspname = 'pg_catalog' OR n.nspname = 'information_schema' THEN
> CASE c.relkind   WHEN 'r' THEN 'SYSTEM TABLE'   WHEN 'v' THEN 'SYSTEM
> VIEW'   WHEN 'i' THEN 'SYSTEM INDEX'   ELSE NULL
> END  WHEN n.nspname = 'pg_toast' THEN CASE c.relkind   WHEN 'r' THEN
> 'SYSTEM TOAST TABLE'   WHEN 'i' THEN 'SYSTEM TOAST INDEX'   ELSE NULL
>   END  ELSE CASE c.relkind   WHEN 'r' THEN 'TEMPOR
> ARY TABLE'   WHEN 'i' THEN 'TEMPORARY INDEX'   WHEN 'S' THEN
> 'TEMPORARY SEQUENCE'   WHEN 'v' THEN 'TEMPORARY VIEW'   ELSE NULL
> END  END  WHEN false THEN CASE c.relkind  WHEN 'r' THEN 'TAB
> LE'  WHEN 'i' THEN 'INDEX'  WHEN 'S' THEN 'SEQUENCE'  WHEN 'v' THEN
> 'VIEW'  WHEN 'c' THEN 'TYPE'  WHEN 'f' THEN 'FOREIGN TABLE'  WHEN 'm'
> THEN 'MATERIALIZED VIEW'  ELSE NULL  END  ELSE NULL
>   END  AS TABLE_TYPE, d.description AS REMARKS  FROM
> pg_catalog.pg_namespace n, pg_catalog.pg_class c  L
>  16384 | 15013 | idle   | SELECT NULL AS TABLE_CAT, n.nspname AS
> TABLE_SCHEM, c.relname AS TABLE_NAME,  CASE n.nspname ~ '^pg_' OR
> n.nspname = 'information_schema'  WHEN true THEN CASE  WHE
> N n.nspname = 'pg_catalog' OR n.nspname = 'information_schema' THEN
> CASE c.relkind   WHEN 'r' THEN 'SYSTEM TABLE'   WHEN 'v' THEN 'SYSTEM
> VIEW'   WHEN 'i' THEN 'SYSTEM INDEX'   ELSE NULL
> END  WHEN n.nspname = 'pg_toast' THEN CASE c.relkind   WHEN 'r' THEN
> 'SYSTEM TOAST TABLE'   WHEN 'i' THEN 'SYSTEM TOAST INDEX'   ELSE NULL
>   END  ELSE CASE c.relkind   WHEN 'r' THEN 'TEMPOR
> ARY TABLE'   WHEN 'i' THEN 'TEMPORARY INDEX'   WHEN 'S' THEN
> 'TEMPORARY SEQUENCE'   WHEN 'v' THEN 'TEMPORARY VIEW'   ELSE NULL
> END  END  WHEN false THEN CASE c.relkind  WHEN 'r' THEN 'TAB
> LE'  WHEN 'i' THEN 'INDEX'  WHEN 'S' THEN 'SEQUENCE'  WHEN 'v' THEN
> 'VIEW'  WHEN 'c' THEN 'TYPE'  WHEN 'f' THEN 'FOREIGN TABLE'  WHEN 'm'
> THEN 'MATERIALIZED VIEW'  ELSE NULL  END  ELSE NULL
>   END  AS TABLE_TYPE, d.description AS REMARKS  FROM
> pg_catalog.pg_namespace n, pg_catalog.pg_class c  L
>  16384 | 15014 | idle   | SELECT NULL AS TABLE_CAT, n.nspname AS
> TABLE_SCHEM, c.relname AS TABLE_NAME,  CASE n.nspname ~ '^pg_' OR
> n.nspname = 'information_schema'  WHEN true THEN CASE  WHE
> N n.nspname = 'pg_catalog' OR n.nspname = 'information_schema' THEN
> CASE c.relkind   WHEN 'r' THEN 'SYSTEM TABLE'   WHEN 'v' THEN 'SYSTEM
> VIEW'   WHEN 'i' THEN 'SYSTEM INDEX'   ELSE NULL
> END  WHEN n.nspname = 'pg_toast' THEN CASE c.relkind   WHEN 'r' THEN
> 'SYSTEM TOAST TABLE'   WHEN 'i' THEN 'SYSTEM TOAST INDEX'   ELSE NULL
>   END  ELSE CASE c.relkind   WHEN 'r' THEN 'TEMPOR
> ARY TABLE'   WHEN 'i' THEN 'TEMPORARY INDEX'   WHEN 'S' THEN
> 'TEMPORARY SEQUENCE'   WHEN 'v' THEN 'TEMPORARY VIEW'   ELSE NULL
> END  END  WHEN false THEN CASE c.relkind  WHEN 'r' THEN 'TAB
> LE'  WHEN 'i' THEN 'INDEX'  WHEN 'S' THEN 'SEQUENCE'  WHEN 'v' THEN
> 'VIEW'  WHEN 'c' THEN 'TYPE'  WHEN 'f' THEN 'FOREIGN TABLE'  WHEN 'm'
> THEN 'MATERIALIZED VIEW'  ELSE NULL  END  ELSE NULL
>   END  AS TABLE_TYPE, d.description AS REMARKS  FROM
> pg_catalog.pg_namespace n, pg_catalog.pg_class c  L

Please look that all activity on database server are select on postgres
catalog and their state are idle, so it looks like there is no problem
related to dataserver.


>