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Rebuild indexes in 12.1.0.2

in Database Administration (MOSC) 2 commentsAnswered

Hi All

Good day

WE have 12.1.0.2 database which is basically read & write intensive database

We have rebuilt the indexes with parallel 5 this weekend .

For example ALTER INDEX schema.table_anme REBUILD online parallel 5;  

After that we have seen one of our job is taking time , so when collected stats and reran the job it was quick. no issues.

Questions

  1. Does it has got to do anything with parallel degree 5. When the sql was executing we have see it was running in parallel ( when check the degree in dba_indexes it was changed to 5 ) .
  2. Should we put back the degree to 1 after rebuilding index completes . If we don't does it have any performance impact .

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