Changeset 19959 for trunk/Nebulous-Server/lib/Nebulous/Server/SQL.pm

Timestamp:

Oct 7, 2008, 11:53:21 AM (18 years ago)

Author:

jhoblitt

Message:

change getmountedvol() to use a view of the volume table to avoid table level locks being set by a cursor

File:

• trunk/Nebulous-Server/lib/Nebulous/Server/SQL.pm (modified) (3 diffs)

trunk/Nebulous-Server/lib/Nebulous/Server/SQL.pm

@@ -1 +1 @@
 # Copyright (c) 2004  Joshua Hoblitt
 #
-# $Id: SQL.pm,v 1.65 2008-10-01 02:06:17 jhoblitt Exp $
+# $Id: SQL.pm,v 1.66 2008-10-07 21:53:21 jhoblitt Exp $
 
 package Nebulous::Server::SQL;
@@ -498 +498 @@
     DECLARE xattrvar BOOLEAN;
     DECLARE trans_level VARCHAR(255);
-    DECLARE cur1 CURSOR FOR SELECT vol_id, name, host, path, allocate, available, xattr FROM volume;
+    DECLARE cur1 CURSOR FOR SELECT vol_id, name, host, path, allocate, available, xattr FROM v;
     DECLARE CONTINUE HANDLER FOR SQLSTATE '02000' SET done = TRUE;
 
+    CREATE OR REPLACE ALGORITHM = TEMPTABLE VIEW v AS SELECT * FROM volume;
     -- store the current transaction level
-    SELECT @@session.tx_isolation INTO trans_level; 
+--    SELECT @@session.tx_isolation INTO trans_level; 
 
     -- set trans level to repeatable-read so the volume table does not change
     -- out from under our cursor
-    SET @@session.tx_isolation = 'REPEATABLE-READ';
+--    SET @@session.tx_isolation = 'REPEATABLE-READ';
 
     -- iterate over the volume table finding the coresponding entry in the
@@ -531 +532 @@
 
     -- restore the original transaction level
-    SET @@session.tx_isolation = trans_level;
-
+--    SET @@session.tx_isolation = trans_level;
+
+    DROP VIEW v;
     COMMIT;
 END