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Some mop-up work for savepoints (nested transactions). Store a small

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number of active subtransaction XIDs in each backend's PGPROC entry,
and use this to avoid expensive probes into pg_subtrans during
TransactionIdIsInProgress.  Extend EOXactCallback API to allow add-on
modules to get control at subxact start/end.  (This is deliberately
not compatible with the former API, since any uses of that API probably
need manual review anyway.)  Add basic reference documentation for
SAVEPOINT and related commands.  Minor other cleanups to check off some
of the open issues for subtransactions.
Alvaro Herrera and Tom Lane.
This commit is contained in:
Tom Lane
2004-08-01 17:32:22 +00:00
parent 9d9cdf82a4
commit efcaf1e868
23 changed files with 1103 additions and 330 deletions
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5
src/backend/tcop/utility.c
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@@ -10,7 +10,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/tcop/utility.c,v 1.221 2004/07/27 05:11:03 tgl Exp $
* $PostgreSQL: pgsql/src/backend/tcop/utility.c,v 1.222 2004/08/01 17:32:18 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -326,8 +326,7 @@ ProcessUtility(Node *parsetree,
{
/*
* START TRANSACTION, as defined by SQL99:
* Identical to BEGIN, except that it takes a few
* additional options. Same code for both.
* Identical to BEGIN. Same code for both.
*/
case TRANS_STMT_BEGIN:
case TRANS_STMT_START: