sharpetronics/PostgreSQL
1
0
Fork 0
mirror of https://github.com/postgres/postgres.git synced 2025-10-31 00:03:57 -04:00
Code Issues Projects Releases Wiki Activity

Log sequence creation (to initialize magic number on recovery).

Browse Source
This commit is contained in:
Vadim B. Mikheev 2001-04-03 21:58:00 +00:00
parent 5f5db804f5
commit 1d9819d69e
1 changed files with 35 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

38
src/backend/commands/sequence.c
View File

@ -8,7 +8,7 @@
* *
* *
* IDENTIFICATION * IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/commands/sequence.c,v 1.52 2001/03/22 03:59:23 momjian Exp $ * $Header: /cvsroot/pgsql/src/backend/commands/sequence.c,v 1.53 2001/04/03 21:58:00 vadim Exp $
* *
*------------------------------------------------------------------------- *-------------------------------------------------------------------------
*/ */
@ -181,9 +181,41 @@ DefineSequence(CreateSeqStmt *seq)
/* Now - form & insert sequence tuple */ /* Now - form & insert sequence tuple */
tuple = heap_formtuple(tupDesc, value, null); tuple = heap_formtuple(tupDesc, value, null);
heap_insert(rel, tuple); heap_insert(rel, tuple);
ReleaseBuffer(buf);
if (WriteBuffer(buf) == STATUS_ERROR) /*
elog(ERROR, "DefineSequence: WriteBuffer failed"); * After crash REDO of heap_insert above would re-init page and
* our magic number would be lost. We have to log sequence creation.
* This means two log records instead of one -:(
*/
START_CRIT_SECTION();
{
xl_seq_rec xlrec;
XLogRecPtr recptr;
XLogRecData rdata[2];
Form_pg_sequence newseq = (Form_pg_sequence) GETSTRUCT(tuple);
/* We do not log first nextval call, so "advance" sequence here */
newseq->is_called = 't';
newseq->log_cnt = 0;
xlrec.node = rel->rd_node;
rdata[0].buffer = InvalidBuffer;
rdata[0].data = (char *) &xlrec;
rdata[0].len = sizeof(xl_seq_rec);
rdata[0].next = &(rdata[1]);
rdata[1].buffer = InvalidBuffer;
rdata[1].data = (char*) tuple->t_data;
rdata[1].len = tuple->t_len;
rdata[1].next = NULL;
recptr = XLogInsert(RM_SEQ_ID, XLOG_SEQ_LOG | XLOG_NO_TRAN, rdata);
PageSetLSN(page, recptr);
PageSetSUI(page, ThisStartUpID);
}
END_CRIT_SECTION();
heap_close(rel, AccessExclusiveLock); heap_close(rel, AccessExclusiveLock);
} }