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RE: stale partition statistics

From: Noveljic Nenad <nenad.noveljic_at_vontobel.com>
Date: Mon, 8 Mar 2021 19:15:37 +0000
Message-ID: <a32a49059b394ab9b5bdcb8f82b10c2f_at_vontobel.com> 








Hi Jonathan,



It is 19c.



Best regards,



Nenad



From: oracle-l-bounce_at_freelists.org <oracle-l-bounce_at_freelists.org> On Behalf Of Jonathan Lewis
Sent: Montag, 8. März 2021 20:06


To: ORACLE-L (oracle-l_at_freelists.org) <oracle-l_at_freelists.org>
Subject: Re: stale partition statistics




Nenad,



Have you told us a version number? I can't find one in the email trail.



Regards


Jonathan Lewis




On Mon, 8 Mar 2021 at 18:54, Noveljic Nenad <nenad.noveljic_at_vontobel.com<mailto:nenad.noveljic_at_vontobel.com>> wrote:
The statistics were gathered as follows:



   SYS.DBMS_STATS.GATHER_SCHEMA_STATS (


      OwnName            => ‘USER',
     Options            => 'GATHER STALE',
     Method_Opt         => 'FOR ALL COLUMNS SIZE REPEAT ',
      Degree             => 4,
      Cascade            => TRUE,
      No_Invalidate      => FALSE);





All partitions had stale_stats = ‘NO’. Tthe amount of changes didn’t exceed the staleness thresholds.



Yet the gather_schema_stats considered the statistics stale because of MON_MODS_V.flags=8 on all partitions. The number of modifications isn’t the only criteria for staleness. Gather_schema_stats dropped and recalculated all the synopses for this table.



Interestingly, when I executed gather_table_stats, synopses weren’t recreated, even when flags=8.



My entertainment for tomorrow is to figure out what set MON_MODS_V .flags to 8, unless somebody knows the answer. Truncate, for example, sets it to 1.



Best regards,



Nenad




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Received on Mon Mar 08 2021 - 20:15:37 CET












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