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Include the backend ID in the relpath of temporary relations.

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This allows us to reliably remove all leftover temporary relation
files on cluster startup without reference to system catalogs or WAL;
therefore, we no longer include temporary relations in XLOG_XACT_COMMIT
and XLOG_XACT_ABORT WAL records.

Since these changes require including a backend ID in each
SharedInvalSmgrMsg, the size of the SharedInvalidationMessage.id
field has been reduced from two bytes to one, and the maximum number
of connections has been reduced from INT_MAX / 4 to 2^23-1.  It would
be possible to remove these restrictions by increasing the size of
SharedInvalidationMessage by 4 bytes, but right now that doesn't seem
like a good trade-off.

Review by Jaime Casanova and Tom Lane.
This commit is contained in:
Robert Haas
2010-08-13 20:10:54 +00:00
parent 3f9479ef3f
commit debcec7dc3
37 changed files with 669 additions and 343 deletions
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6
src/backend/commands/sequence.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/commands/sequence.c,v 1.169 2010/07/25 23:21:21 rhaas Exp $
* $PostgreSQL: pgsql/src/backend/commands/sequence.c,v 1.170 2010/08/13 20:10:51 rhaas Exp $
*
*-------------------------------------------------------------------------
*/
@ -472,7 +472,7 @@ nextval_internal(Oid relid)
RelationGetRelationName(seqrel))));
/* read-only transactions may only modify temp sequences */
if (!seqrel->rd_islocaltemp)
if (seqrel->rd_backend != MyBackendId)
PreventCommandIfReadOnly("nextval()");
if (elm->last != elm->cached) /* some numbers were cached */
@ -749,7 +749,7 @@ do_setval(Oid relid, int64 next, bool iscalled)
RelationGetRelationName(seqrel))));
/* read-only transactions may only modify temp sequences */
if (!seqrel->rd_islocaltemp)
if (seqrel->rd_backend != MyBackendId)
PreventCommandIfReadOnly("setval()");
/* lock page' buffer and read tuple */