Re: Creating unique index on huge table.

  • From: Tim Gorman <tim@xxxxxxxxx>
  • To: oracle-l@xxxxxxxxxxxxx
  • Date: Fri, 23 Sep 2016 22:40:05 -0600

I have rebuilt a large index on a database as a DBA several times and I do remember that the difference between "compute statistics" and without "compute statistics" was several minutes. In the large scheme of things, that may not be important. However, my index was nowhere near as large as yours. The index was < 1 TB, around 800 GB.

COMPUTE STATISTICS was deprecated in Oracle10gR2; excerpted from the 10.2 documentation <>...

   /*COMPUTE STATISTICS* //In earlier releases, you could use this
   clause to start or stop the collection of statistics on an index.
   This clause has been deprecated. Oracle Database now automatically
   collects statistics during index creation and rebuild. This clause
   is supported for backward compatibility and will not cause errors.

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