From: | Gaetano Mendola <mendola(at)bigfoot(dot)com> |
---|---|
To: | "pgsql-bugs(at)postgresql(dot)org" <pgsql-bugs(at)postgresql(dot)org> |
Cc: | Tomas Szepe <szepe(at)pinerecords(dot)com> |
Subject: | Re: Postgresql 'eats' all mi data partition |
Date: | 2003-09-27 11:20:25 |
Message-ID: | 3F757279.90403@bigfoot.com |
Views: | Raw Message | Whole Thread | Download mbox | Resend email |
Thread: | |
Lists: | pgsql-bugs |
Tomas Szepe wrote:
>>[mendola(at)bigfoot(dot)com]
>>
>>Tomas Szepe wrote:
>>
>>>>[tgl(at)sss(dot)pgh(dot)pa(dot)us]
>>>>
>>>>
>>>>
>>>>>indexes:
>>>>>stats_min_pkey primary key btree (ip, "start")
>>>>>stats_min_start btree ("start")
>>>>>stats_hr_pkey primary key btree (ip, "start")
>>>>>stats_hr_start btree ("start")
>>>>
>>>>>ip is of type "inet" in all tables.
>>>>>start is of type "timestamp without time zone" in all tables.
>>>>
>>>>Okay, so a pkey index entry will take 32 bytes counting overhead ...
>>>>you've got about 10:1 bloat on the stats_min indexes and 2:1 in stats_hr.
>>>>Definitely bad :-(
>>>
>>>
>>>The only difference between the way stats_min and stats_hr are updated
>>>stems from the fact that stats_min only holds records for the last 1440
>>>minutes (because of its killer time granularity), whereas stats_hr
>>>holds its data until we decide some of it is obsolete enough and
>>>issue a "delete from" by hand.
>>
>>Are you sure that all indexes are needed and that a partial index could
>>not help ? What about the statistics on these indexes ? Are they really
>>used ?
>
>
> Yup, they're all essential. :(
May I see yours tipical queries where these indexes are involved ?
Regards
Gaetano Mendola
From | Date | Subject | |
---|---|---|---|
Next Message | Tomas Szepe | 2003-09-27 11:31:27 | Re: Postgresql 'eats' all mi data partition |
Previous Message | Tomas Szepe | 2003-09-27 10:57:40 | Re: Postgresql 'eats' all mi data partition |