Re: Gather table stats without partition stats

Hello Moustafa,

1. Maybe you are referring to this one "Statistics at the subpartition level are gathered and stored by the database, but note that synopses are created at the partition level only. This means that if the statistics for a subpartition become stale due to data changes, then the statistics (and synopsis) for the parent partition will be refreshed by examining all of its subpartitions. The database only regathers subpartition-level statistics on subpartitions that are stale." - https://blogs.oracle.com/optimizer/efficient-statistics-maintenance-for-partitioned-tables-using-incremental-statistics-part-1 - but not quite sure as this talks about subpartitions

Anyway partition statistics are used only in case of partition pruning to one single partition (and when the partition is known at hard parsing / optimization time).

2) I guess what you are looking for is DBMS_STATS.GATHER_TABLE_STATS(granularity => 'GLOBAL') - you can also set it as default on table level.

Best Regards
Stefan Koehler

Independent Oracle performance consultant and researcher Website: http://www.soocs.de
Twitter: _at_OracleSK

> Moustafa Ahmed <moustafa_dba_at_hotmail.com> hat am 17.06.2021 20:22 geschrieben:
>
> Listers
>
> 1-on 19c I believe I read before that not gathering partition statics is much safer specially since 12c and we should be enough with table stats..
> Is that true?
>
> 2-how can we ignite gathering partition stats for a table?
>
> Thank you!--
> http://www.freelists.org/webpage/oracle-l

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