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

diff --git a/src/backend/commands/sequence.c b/src/backend/commands/sequence.c
index 85a8b740048fab6ac204fc687c8e49311e84e978..00a96a99a5ac2907e8151373f715ef7d2cf8dd0c 100644 (file)
--- a/src/backend/commands/sequence.c
+++ b/src/backend/commands/sequence.c
@@ -8,7 +8,7 @@
  *
  *
  * 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 */
    tuple = heap_formtuple(tupDesc, value, null);
    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);
 }