Обсуждение: Issue with pg_toast tables

Hello

2012/11/26 Ranjeet Dhumal <jeetu.dhumal@gmail.com>:
> Hi All ,
>
> Am facing one problem related to pg_toast table , its grown very huge upto
> 31GB , even am vacuuming(not full) it daily , my fsm parameters are default,
> can anyone  tell how to decrease the size , if am firing any query on
> gen_bulk_20121126 its response time is very slow as compared to few days
> before .
> For changing fsm parameters it will need restart , can anyone suggest me any
> other way for decreasing the size of this pg_toast tables.
>

lazy vacuum doesn't decrease size

Regards

Pavel Stehule

>
>                  nspname           |                            relname
> |    size   |                  refrelname               |
> relidxrefrelname          | relfilenode    | relkind  | reltuples    |
> relpages
>
-----------------------------------------+----------------------------------------------------------------+------------+-----------------------------------------------+-----------------------------------------------+------------------+-----------+----------------+----------
>  pg_toast                            | pg_toast_123049508
> | 31 GB   |        gen_bulk_20121126            |
> |   123049512 | t          |  16340229 |  4051494
>
>
> --
> --Regards
>   Ranjeet  R. Dhumal
>
>

On 11/25/12 10:36 PM, Ranjeet Dhumal wrote:
> Am facing one problem related to pg_toast table , its grown very huge
> upto 31GB , even am vacuuming(not full) it daily , my fsm parameters
> are default, can anyone  tell how to decrease the size , if am firing
> any query on  gen_bulk_20121126 its response time is very slow as
> compared to few days before .
> For changing fsm parameters it will need restart , can anyone suggest
> me any other way for decreasing the size of this pg_toast tables.
>

pg_toast contains large data that won't fit in regular tuples.

this table that you're getting slow queries on, could you show us one of
these slow queries with EXPLAIN ANALYZE ?    if your table has grown
significantly it could need a carefully chosen index to speed up these
queries, or something similar.

also the output of...

     VACUUM VERBOSE pg_toast_123049508   ;

may be enlightening.



--
john r pierce                            N 37, W 122
santa cruz ca                         mid-left coast

2012/11/26 Ranjeet Dhumal <jeetu.dhumal@gmail.com>:
> Hi Pavel ,
>
> For Tunning  this which parameter i have to change  from the configuration ,
> and at the time of setting it up which thinks i have to care i mean what
> will be the impact of that ?

you have to use full vacuum

Regards

Pavel


>
>
> On 26 November 2012 12:09, Pavel Stehule <pavel.stehule@gmail.com> wrote:
>>
>> Hello
>>
>> 2012/11/26 Ranjeet Dhumal <jeetu.dhumal@gmail.com>:
>> > Hi All ,
>> >
>> > Am facing one problem related to pg_toast table , its grown very huge
>> > upto
>> > 31GB , even am vacuuming(not full) it daily , my fsm parameters are
>> > default,
>> > can anyone  tell how to decrease the size , if am firing any query on
>> > gen_bulk_20121126 its response time is very slow as compared to few days
>> > before .
>> > For changing fsm parameters it will need restart , can anyone suggest me
>> > any
>> > other way for decreasing the size of this pg_toast tables.
>> >
>>
>> lazy vacuum doesn't decrease size
>>
>> Regards
>>
>> Pavel Stehule
>>
>> >
>> >                  nspname           |                            relname
>> > |    size   |                  refrelname               |
>> > relidxrefrelname          | relfilenode    | relkind  | reltuples    |
>> > relpages
>> >
>> >
-----------------------------------------+----------------------------------------------------------------+------------+-----------------------------------------------+-----------------------------------------------+------------------+-----------+----------------+----------
>> >  pg_toast                            | pg_toast_123049508
>> > | 31 GB   |        gen_bulk_20121126            |
>> > |   123049512 | t          |  16340229 |  4051494
>> >
>> >
>> > --
>> > --Regards
>> >   Ranjeet  R. Dhumal
>> >
>> >
>
>
>
>
> --
> --Regards
>   Ranjeet  R. Dhumal
>
>