diff options
| author | Simon Riggs <simon@2ndQuadrant.com> | 2011-06-28 22:58:17 +0100 |
|---|---|---|
| committer | Simon Riggs <simon@2ndQuadrant.com> | 2011-06-28 22:58:17 +0100 |
| commit | 465883b0a2b4236ba6b31b648a9eabef3b7cdddb (patch) | |
| tree | 830d1e0365e02b4a9fa897eb1a084b36f342e428 /src/include | |
| parent | 6f3efa76b042cdc457dba5bf8d8257f3ae83fb10 (diff) | |
| download | postgresql-465883b0a2b4236ba6b31b648a9eabef3b7cdddb.tar.gz | |
Introduce compact WAL record for the common case of commit (non-DDL).
XLOG_XACT_COMMIT_COMPACT leaves out invalidation messages and relfilenodes,
saving considerable space for the vast majority of transaction commits.
XLOG_XACT_COMMIT keeps same definition as XLOG_PAGE_MAGIC 0xD067 and earlier.
Leonardo Francalanci and Simon Riggs
Diffstat (limited to 'src/include')
| -rw-r--r-- | src/include/access/xact.h | 15 | ||||
| -rw-r--r-- | src/include/access/xlog_internal.h | 2 |
2 files changed, 14 insertions, 3 deletions
diff --git a/src/include/access/xact.h b/src/include/access/xact.h index cb440d41f1..c585752b00 100644 --- a/src/include/access/xact.h +++ b/src/include/access/xact.h @@ -106,6 +106,7 @@ typedef void (*SubXactCallback) (SubXactEvent event, SubTransactionId mySubid, #define XLOG_XACT_COMMIT_PREPARED 0x30 #define XLOG_XACT_ABORT_PREPARED 0x40 #define XLOG_XACT_ASSIGNMENT 0x50 +#define XLOG_XACT_COMMIT_COMPACT 0x60 typedef struct xl_xact_assignment { @@ -116,6 +117,16 @@ typedef struct xl_xact_assignment #define MinSizeOfXactAssignment offsetof(xl_xact_assignment, xsub) +typedef struct xl_xact_commit_compact +{ + TimestampTz xact_time; /* time of commit */ + int nsubxacts; /* number of subtransaction XIDs */ + /* ARRAY OF COMMITTED SUBTRANSACTION XIDs FOLLOWS */ + TransactionId subxacts[1]; /* VARIABLE LENGTH ARRAY */ +} xl_xact_commit_compact; + +#define MinSizeOfXactCommitCompact offsetof(xl_xact_commit_compact, subxacts) + typedef struct xl_xact_commit { TimestampTz xact_time; /* time of commit */ @@ -145,8 +156,8 @@ typedef struct xl_xact_commit #define XACT_COMPLETION_FORCE_SYNC_COMMIT 0x02 /* Access macros for above flags */ -#define XactCompletionRelcacheInitFileInval(xlrec) ((xlrec)->xinfo & XACT_COMPLETION_UPDATE_RELCACHE_FILE) -#define XactCompletionForceSyncCommit(xlrec) ((xlrec)->xinfo & XACT_COMPLETION_FORCE_SYNC_COMMIT) +#define XactCompletionRelcacheInitFileInval(xinfo) (xinfo & XACT_COMPLETION_UPDATE_RELCACHE_FILE) +#define XactCompletionForceSyncCommit(xinfo) (xinfo & XACT_COMPLETION_FORCE_SYNC_COMMIT) typedef struct xl_xact_abort { diff --git a/src/include/access/xlog_internal.h b/src/include/access/xlog_internal.h index 34316fffeb..4eaa243948 100644 --- a/src/include/access/xlog_internal.h +++ b/src/include/access/xlog_internal.h @@ -71,7 +71,7 @@ typedef struct XLogContRecord /* * Each page of XLOG file has a header like this: */ -#define XLOG_PAGE_MAGIC 0xD067 /* can be used as WAL version indicator */ +#define XLOG_PAGE_MAGIC 0xD068 /* can be used as WAL version indicator */ typedef struct XLogPageHeaderData { |