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| author | Robert Haas <rhaas@postgresql.org> | 2017-03-23 14:08:23 -0400 |
|---|---|---|
| committer | Robert Haas <rhaas@postgresql.org> | 2017-03-23 14:26:31 -0400 |
| commit | ea42cc18c35381f639d45628d792e790ff39e271 (patch) | |
| tree | 223916f28189cb8fb5b40793ff563928795f62ca /src/backend/storage | |
| parent | 50c956add83963d7bbb367dd0b879fccddebd623 (diff) | |
Track the oldest XID that can be safely looked up in CLOG.
This provides infrastructure for looking up arbitrary, user-supplied
XIDs without a risk of scary-looking failures from within the clog
module. Normally, the oldest XID that can be safely looked up in CLOG
is the same as the oldest XID that can reused without causing
wraparound, and the latter is already tracked. However, while
truncation is in progress, the values are different, so we must
keep track of them separately.
Craig Ringer, reviewed by Simon Riggs and by me.
Discussion: http://postgr.es/m/CAMsr+YHQiWNEi0daCTboS40T+V5s_+dst3PYv_8v2wNVH+Xx4g@mail.gmail.com
Diffstat (limited to 'src/backend/storage')
| -rw-r--r-- | src/backend/storage/lmgr/lwlocknames.txt | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/src/backend/storage/lmgr/lwlocknames.txt b/src/backend/storage/lmgr/lwlocknames.txt index cd8b08f50da..e6025ecedb3 100644 --- a/src/backend/storage/lmgr/lwlocknames.txt +++ b/src/backend/storage/lmgr/lwlocknames.txt @@ -49,3 +49,4 @@ MultiXactTruncationLock 41 OldSnapshotTimeMapLock 42 BackendRandomLock 43 LogicalRepWorkerLock 44 +CLogTruncationLock 45 |