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Introduce compact WAL record for the common case of commit (non-DDL).

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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
This commit is contained in:
Simon Riggs
2011-06-28 22:58:17 +01:00
parent 6f3efa76b0
commit 465883b0a2
4 changed files with 195 additions and 84 deletions
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15
src/include/access/xact.h
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@@ -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
{

2
src/include/access/xlog_internal.h
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@@ -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
{