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Improve pg_dump's query for retrieving BLOB comments to be more efficient

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when there are many blobs and not so many comments.  Tamas Vincze
This commit is contained in:
Tom Lane 2009-04-01 18:54:33 +00:00
parent b552664447
commit 591cbf673b
1 changed files with 8 additions and 2 deletions
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10
src/bin/pg_dump/pg_dump.c
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@ -12,7 +12,7 @@
* by PostgreSQL
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/bin/pg_dump/pg_dump.c,v 1.482.2.1 2009/01/18 20:44:53 tgl Exp $
* $PostgreSQL: pgsql/src/bin/pg_dump/pg_dump.c,v 1.482.2.2 2009/04/01 18:54:33 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -1758,7 +1758,13 @@ dumpBlobComments(Archive *AH, void *arg)
selectSourceSchema("pg_catalog");
/* Cursor to get all BLOB comments */
if (AH->remoteVersion >= 70200)
if (AH->remoteVersion >= 70300)
blobQry = "DECLARE blobcmt CURSOR FOR SELECT loid, "
"obj_description(loid, 'pg_largeobject') "
"FROM (SELECT DISTINCT loid FROM "
"pg_description d JOIN pg_largeobject l ON (objoid = loid) "
"WHERE classoid = 'pg_largeobject'::regclass) ss";
else if (AH->remoteVersion >= 70200)
blobQry = "DECLARE blobcmt CURSOR FOR SELECT loid, obj_description(loid, 'pg_largeobject') FROM (SELECT DISTINCT loid FROM pg_largeobject) ss";
else if (AH->remoteVersion >= 70100)
blobQry = "DECLARE blobcmt CURSOR FOR SELECT loid, obj_description(loid) FROM (SELECT DISTINCT loid FROM pg_largeobject) ss";