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Keep track of the last active slot in the shared ProcState array, so

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that search loops only have to scan that far and not through all maxBackends
entries.  This eliminates a performance penalty for setting maxBackends
much higher than the average number of active backends.  Also, eliminate
no-longer-used 'backend tag' concept.  Remove setting of environment
variables at backend start (except for CYR_RECODE), since none of them
are being examined by the backend any longer.
This commit is contained in:
Tom Lane
2000-11-12 20:51:52 +00:00
parent c48025e799
commit ebb0a20149
10 changed files with 153 additions and 235 deletions
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4
src/include/storage/sinval.h
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@@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2000, PostgreSQL, Inc
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Id: sinval.h,v 1.14 2000/01/26 05:58:33 momjian Exp $
* $Id: sinval.h,v 1.15 2000/11/12 20:51:52 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -27,7 +27,7 @@ extern void RegisterSharedInvalid(int cacheId, Index hashIndex,
extern void InvalidateSharedInvalid(void (*invalFunction) (),
void (*resetFunction) ());
extern bool DatabaseHasActiveBackends(Oid databaseId);
extern bool DatabaseHasActiveBackends(Oid databaseId, bool ignoreMyself);
extern bool TransactionIdIsInProgress(TransactionId xid);
extern void GetXmaxRecent(TransactionId *XmaxRecent);