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Various improvements of skipping index scan during vacuum technics

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- Change vacuum_cleanup_index_scale_factor GUC to PGC_USERSET.
  vacuum_cleanup_index_scale_factor GUC was defined as PGC_SIGHUP.  But this
  GUC affects not only autovacuum.  So it might be useful to change it from user
  session in order to influence manually runned VACUUM.
- Add missing tab-complete support for vacuum_cleanup_index_scale_factor
  reloption.
- Fix condition for B-tree index cleanup.
  Zero value of vacuum_cleanup_index_scale_factor means that user wants B-tree
  index cleanup to be never skipped.
- Documentation and comment improvements

Authors: Justin Pryzby, Alexander Korotkov, Liudmila Mantrova
Reviewed by: all authors and Robert Haas
Discussion: https://www.postgresql.org/message-id/flat/20180502023025.GD7631%40telsasoft.com
This commit is contained in:
Teodor Sigaev
2018-05-10 13:31:47 +03:00
parent ddc1f32ee5
commit 8e12f4a250
5 changed files with 43 additions and 21 deletions
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2
src/backend/utils/misc/guc.c
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@ -3238,7 +3238,7 @@ static struct config_real ConfigureNamesReal[] =
},
{
{"vacuum_cleanup_index_scale_factor", PGC_SIGHUP, AUTOVACUUM,
{"vacuum_cleanup_index_scale_factor", PGC_USERSET, AUTOVACUUM,
gettext_noop("Number of tuple inserts prior to index cleanup as a fraction of reltuples."),
NULL
},