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Reduce lock levels of CREATE TRIGGER and some ALTER TABLE, CREATE RULE actions.

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Avoid hard-coding lockmode used for many altering DDL commands, allowing easier
future changes of lock levels. Implementation of initial analysis on DDL
sub-commands, so that many lock levels are now at ShareUpdateExclusiveLock or
ShareRowExclusiveLock, allowing certain DDL not to block reads/writes.
First of number of planned changes in this area; additional docs required
when full project complete.
This commit is contained in:
Simon Riggs
2010-07-28 05:22:24 +00:00
parent 133924e13e
commit 2dbbda02e7
10 changed files with 426 additions and 232 deletions
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9
src/include/commands/tablecmds.h
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@@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2010, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/commands/tablecmds.h,v 1.46 2010/02/01 19:28:56 rhaas Exp $
* $PostgreSQL: pgsql/src/include/commands/tablecmds.h,v 1.47 2010/07/28 05:22:24 sriggs Exp $
*
*-------------------------------------------------------------------------
*/
@@ -15,6 +15,7 @@
#define TABLECMDS_H
#include "nodes/parsenodes.h"
#include "storage/lock.h"
#include "utils/relcache.h"
@@ -24,12 +25,14 @@ extern void RemoveRelations(DropStmt *drop);
extern void AlterTable(AlterTableStmt *stmt);
extern void ATExecChangeOwner(Oid relationOid, Oid newOwnerId, bool recursing);
extern LOCKMODE AlterTableGetLockLevel(List *cmds);
extern void ATExecChangeOwner(Oid relationOid, Oid newOwnerId, bool recursing, LOCKMODE lockmode);
extern void AlterTableInternal(Oid relid, List *cmds, bool recurse);
extern void AlterTableNamespace(RangeVar *relation, const char *newschema,
ObjectType stmttype);
ObjectType stmttype, LOCKMODE lockmode);
extern void AlterRelationNamespaceInternal(Relation classRel, Oid relOid,
Oid oldNspOid, Oid newNspOid,