database/postgres
1
0
Fork 0
mirror of https://github.com/postgres/postgres.git synced 2025-10-25 13:17:41 +03:00
Code Activity

Make VACUUM avoid waiting for a cleanup lock, where possible.

Browse Source 
In a regular VACUUM, it's OK to skip pages for which a cleanup lock
isn't immediately available; the next VACUUM will deal with them.  If
we're scanning the entire relation to advance relfrozenxid, we might
need to wait, but only if there are tuples on the page that actually
require freezing.  These changes should greatly reduce the incidence
of of vacuum processes getting "stuck".

Simon Riggs and Robert Haas
This commit is contained in:
Robert Haas
2011-11-07 21:39:40 -05:00
parent bd2396988a
commit bbb6e559c4
3 changed files with 122 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
src/include/access/heapam.h
View File

@@ -111,6 +111,8 @@ extern HTSU_Result heap_lock_tuple(Relation relation, HeapTuple tuple,
extern void heap_inplace_update(Relation relation, HeapTuple tuple);
extern bool heap_freeze_tuple(HeapTupleHeader tuple, TransactionId cutoff_xid,
Buffer buf);
extern bool heap_tuple_needs_freeze(HeapTupleHeader tuple, TransactionId cutoff_xid,
Buffer buf);
extern Oid simple_heap_insert(Relation relation, HeapTuple tup);
extern void simple_heap_delete(Relation relation, ItemPointer tid);