| From: | Alvaro Herrera <alvherre(at)commandprompt(dot)com> |
|---|---|
| To: | Michael Fuhr <mike(at)fuhr(dot)org> |
| Cc: | pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: Vacuuming anything zeroes shared table stats |
| Date: | 2007-06-07 15:25:43 |
| Message-ID: | 20070607152543.GK3664@alvh.no-ip.org |
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| Lists: | pgsql-hackers |
Michael Fuhr wrote:
> Is vacuuming any table supposed to zero the statistics for all
> shared tables? Doesn't that have implications for autovacuum? The
> example below is in 8.2.4 but I'm seeing similar behavior in 8.1.9
> and 8.3devel.
The problem is that the database hash is cleared of databases that no
longer exist, and the database list is constructed by scanning
pg_database. Since no entry exist for the database we use for shared
tables (InvalidOid), the hash table is dropped. The attached patch
fixes this.
> Additionally, in 8.3devel doing anything that queries or modifies a
> shared table seems to zero the statistics for all shared tables.
I'm not sure if this is fixed by the patch; can you verify, or provide a
more specific description of the problem?
--
Alvaro Herrera http://www.CommandPrompt.com/
PostgreSQL Replication, Consulting, Custom Development, 24x7 support
| Attachment | Content-Type | Size |
|---|---|---|
| vacuum-resetshared.patch | text/x-diff | 1.3 KB |
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