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Add vacuum_truncate reloption.

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vacuum_truncate controls whether vacuum tries to truncate off
any empty pages at the end of the table. Previously vacuum always
tried to do the truncation. However, the truncation could cause
some problems; for example, ACCESS EXCLUSIVE lock needs to
be taken on the table during the truncation and can cause
the query cancellation on the standby even if hot_standby_feedback
is true. Setting this reloption to false can be helpful to avoid
such problems.

Author: Tsunakawa Takayuki
Reviewed-By: Julien Rouhaud, Masahiko Sawada, Michael Paquier, Kirk Jamison and Fujii Masao
Discussion: https://postgr.es/m/CAHGQGwE5UqFqSq1=kV3QtTUtXphTdyHA-8rAj4A=Y+e4kyp3BQ@mail.gmail.com
This commit is contained in:
Fujii Masao
2019-04-08 16:43:57 +09:00
parent e3865c3754
commit 119dcfad98
7 changed files with 112 additions and 5 deletions
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src/include/utils/rel.h
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@@ -267,6 +267,7 @@ typedef struct StdRdOptions
bool user_catalog_table; /* use as an additional catalog relation */
int parallel_workers; /* max number of parallel workers */
bool vacuum_index_cleanup; /* enables index vacuuming and cleanup */
bool vacuum_truncate; /* enables vacuum to truncate a relation */
} StdRdOptions;
#define HEAP_MIN_FILLFACTOR 10