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For multi-table ANALYZE, use per-table transactions when possible

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(ie, when not inside a transaction block), so that we can avoid holding
locks longer than necessary.  Per trouble report from Philip Warner.
This commit is contained in:
Tom Lane
2004-05-22 23:14:38 +00:00
parent e26c403fd0
commit 4d86ae4260
3 changed files with 125 additions and 68 deletions
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34
src/backend/access/transam/xact.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/access/transam/xact.c,v 1.166 2004/05/21 05:07:56 tgl Exp $
* $PostgreSQL: pgsql/src/backend/access/transam/xact.c,v 1.167 2004/05/22 23:14:37 tgl Exp $
*
* NOTES
* Transaction aborts can now occur two ways:
@ -1417,7 +1417,7 @@ PreventTransactionChain(void *stmtNode, const char *stmtType)
errmsg("%s cannot be executed from a function", stmtType)));
/* If we got past IsTransactionBlock test, should be in default state */
if (CurrentTransactionState->blockState != TBLOCK_DEFAULT &&
CurrentTransactionState->blockState != TBLOCK_STARTED)
CurrentTransactionState->blockState != TBLOCK_STARTED)
elog(ERROR, "cannot prevent transaction chain");
/* all okay */
}
@ -1462,6 +1462,36 @@ RequireTransactionChain(void *stmtNode, const char *stmtType)
stmtType)));
}
/*
* IsInTransactionChain
*
* This routine is for statements that need to behave differently inside
* a transaction block than when running as single commands. ANALYZE is
* currently the only example.
*
* stmtNode: pointer to parameter block for statement; this is used in
* a very klugy way to determine whether we are inside a function.
*/
bool
IsInTransactionChain(void *stmtNode)
{
/*
* Return true on same conditions that would make PreventTransactionChain
* error out
*/
if (IsTransactionBlock())
return true;
if (!MemoryContextContains(QueryContext, stmtNode))
return true;
if (CurrentTransactionState->blockState != TBLOCK_DEFAULT &&
CurrentTransactionState->blockState != TBLOCK_STARTED)
return true;
return false;
}
/*
* Register or deregister callback functions for end-of-xact cleanup