diff options
| 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/include/access/xlog_internal.h | |
| 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/include/access/xlog_internal.h')
| -rw-r--r-- | src/include/access/xlog_internal.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/src/include/access/xlog_internal.h b/src/include/access/xlog_internal.h index 7957cab98c6..c09c0f8e5f4 100644 --- a/src/include/access/xlog_internal.h +++ b/src/include/access/xlog_internal.h @@ -31,7 +31,7 @@ /* * Each page of XLOG file has a header like this: */ -#define XLOG_PAGE_MAGIC 0xD096 /* can be used as WAL version indicator */ +#define XLOG_PAGE_MAGIC 0xD097 /* can be used as WAL version indicator */ typedef struct XLogPageHeaderData { |