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Support ALTER TABLESPACE name SET/RESET ( tablespace_options ).

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This patch only supports seq_page_cost and random_page_cost as parameters,
but it provides the infrastructure to scalably support many more.
In particular, we may want to add support for effective_io_concurrency,
but I'm leaving that as future work for now.

Thanks to Tom Lane for design help and Alvaro Herrera for the review.
This commit is contained in:
Robert Haas
2010-01-05 21:54:00 +00:00
parent 72559b49c0
commit d86d51a958
28 changed files with 588 additions and 101 deletions
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73
src/backend/commands/tablespace.c
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@ -37,7 +37,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/commands/tablespace.c,v 1.65 2010/01/02 16:57:37 momjian Exp $
* $PostgreSQL: pgsql/src/backend/commands/tablespace.c,v 1.66 2010/01/05 21:53:58 rhaas Exp $
*
*-------------------------------------------------------------------------
*/
@ -49,6 +49,7 @@
#include <sys/stat.h>
#include "access/heapam.h"
#include "access/reloptions.h"
#include "access/sysattr.h"
#include "access/transam.h"
#include "access/xact.h"
@ -57,6 +58,7 @@
#include "catalog/indexing.h"
#include "catalog/pg_tablespace.h"
#include "commands/comment.h"
#include "commands/defrem.h"
#include "commands/tablespace.h"
#include "miscadmin.h"
#include "postmaster/bgwriter.h"
@ -70,6 +72,7 @@
#include "utils/lsyscache.h"
#include "utils/memutils.h"
#include "utils/rel.h"
#include "utils/syscache.h"
#include "utils/tqual.h"
@ -290,6 +293,7 @@ CreateTableSpace(CreateTableSpaceStmt *stmt)
values[Anum_pg_tablespace_spclocation - 1] =
CStringGetTextDatum(location);
nulls[Anum_pg_tablespace_spcacl - 1] = true;
nulls[Anum_pg_tablespace_spcoptions - 1] = true;
tuple = heap_form_tuple(rel->rd_att, values, nulls);
@ -912,6 +916,73 @@ AlterTableSpaceOwner(const char *name, Oid newOwnerId)
}
/*
* Alter table space options
*/
void
AlterTableSpaceOptions(AlterTableSpaceOptionsStmt *stmt)
{
Relation rel;
ScanKeyData entry[1];
HeapScanDesc scandesc;
HeapTuple tup;
Datum datum;
Datum newOptions;
Datum repl_val[Natts_pg_tablespace];
bool isnull;
bool repl_null[Natts_pg_tablespace];
bool repl_repl[Natts_pg_tablespace];
HeapTuple newtuple;
/* Search pg_tablespace */
rel = heap_open(TableSpaceRelationId, RowExclusiveLock);
ScanKeyInit(&entry[0],
Anum_pg_tablespace_spcname,
BTEqualStrategyNumber, F_NAMEEQ,
CStringGetDatum(stmt->tablespacename));
scandesc = heap_beginscan(rel, SnapshotNow, 1, entry);
tup = heap_getnext(scandesc, ForwardScanDirection);
if (!HeapTupleIsValid(tup))
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_OBJECT),
errmsg("tablespace \"%s\" does not exist",
stmt->tablespacename)));
/* Must be owner of the existing object */
if (!pg_tablespace_ownercheck(HeapTupleGetOid(tup), GetUserId()))
aclcheck_error(ACLCHECK_NOT_OWNER, ACL_KIND_TABLESPACE,
stmt->tablespacename);
/* Generate new proposed spcoptions (text array) */
datum = heap_getattr(tup, Anum_pg_tablespace_spcoptions,
RelationGetDescr(rel), &isnull);
newOptions = transformRelOptions(isnull ? (Datum) 0 : datum,
stmt->options, NULL, NULL, false,
stmt->isReset);
(void) tablespace_reloptions(newOptions, true);
/* Build new tuple. */
memset(repl_null, false, sizeof(repl_null));
memset(repl_repl, false, sizeof(repl_repl));
if (newOptions != (Datum) 0)
repl_val[Anum_pg_tablespace_spcoptions - 1] = newOptions;
else
repl_null[Anum_pg_tablespace_spcoptions - 1] = true;
repl_repl[Anum_pg_tablespace_spcoptions - 1] = true;
newtuple = heap_modify_tuple(tup, RelationGetDescr(rel), repl_val,
repl_null, repl_repl);
/* Update system catalog. */
simple_heap_update(rel, &newtuple->t_self, newtuple);
CatalogUpdateIndexes(rel, newtuple);
heap_freetuple(newtuple);
/* Conclude heap scan. */
heap_endscan(scandesc);
heap_close(rel, NoLock);
}
/*
* Routines for handling the GUC variable 'default_tablespace'.
*/