database/postgres
1
0
Fork 0
mirror of https://github.com/postgres/postgres.git synced 2025-07-15 19:21:59 +03:00
Code Activity

Prevent (auto)vacuum from truncating first page of populated matview.

Browse Source 
Per report from Fujii Masao, with regression test using his example.
This commit is contained in:
Kevin Grittner
2013-05-02 17:33:03 -05:00
parent 095018bc32
commit b69ec7cc99
3 changed files with 38 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
src/backend/commands/vacuumlazy.c
View File

@ -230,7 +230,13 @@ lazy_vacuum_rel(Relation onerel, VacuumStmt *vacstmt,
*
* Don't even think about it unless we have a shot at releasing a goodly
* number of pages. Otherwise, the time taken isn't worth it.
*
* Leave a populated materialized view with at least one page.
*/
if (onerel->rd_rel->relkind == RELKIND_MATVIEW &&
vacrelstats->nonempty_pages == 0)
vacrelstats->nonempty_pages = 1;
possibly_freeable = vacrelstats->rel_pages - vacrelstats->nonempty_pages;
if (possibly_freeable > 0 &&
(possibly_freeable >= REL_TRUNCATE_MINIMUM ||