function execute($aParams)
 {
     $this->oUpgrade = $aParams[0];
     if ($this->oUpgrade->oDbh->dbsyntax == 'pgsql') {
         $prefix = $this->oUpgrade->oDBUpgrader->prefix;
         $result = $this->oUpgrade->oDbh->exec("ALTER TABLE {$prefix}zones ALTER zonename TYPE varchar(245)");
         // This ALTER TABLE needs to run in UTC because it stores a UTC timestamp
         $result = $this->oUpgrade->oDbh->exec("SET timezone = 'UTC'");
         $result = $this->oUpgrade->oDbh->exec("ALTER TABLE {$prefix}session ALTER lastused TYPE timestamp");
         $result = $this->oUpgrade->oDbh->exec("SET timezone = DEFAULT");
         $result = $this->oUpgrade->oDbh->exec("ALTER TABLE {$prefix}images ALTER t_stamp TYPE timestamp");
         $result = $this->oUpgrade->oDbh->exec("DROP INDEX " . OA_phpAdsNew::phpPgAdsPrefixedIndex('banners_clientid_idx', $prefix));
         $result = $this->oUpgrade->oDbh->exec("DROP INDEX " . OA_phpAdsNew::phpPgAdsPrefixedIndex('clients_parent_idx', $prefix));
         $result = $this->oUpgrade->oDbh->exec("DROP INDEX " . OA_phpAdsNew::phpPgAdsPrefixedIndex('zones_affiliateid_idx', $prefix));
         $aForeignKeys = $this->oUpgrade->oDbh->getAssoc("\n                SELECT\n                    r.conname AS fk,\n                    c.relname AS table\n                FROM\n                    pg_catalog.pg_class c JOIN\n                    pg_catalog.pg_constraint r ON (r.conrelid = c.oid)\n                WHERE\n                    c.relname IN ('{$prefix}acls', '{$prefix}banners', '{$prefix}clients', '{$prefix}zones') AND\n                    pg_catalog.pg_table_is_visible(c.oid) AND\n                    r.contype = 'f'\n                ORDER BY\n                    1,2\n            ");
         foreach ($aForeignKeys as $fkey => $table) {
             $result = $this->oUpgrade->oDbh->exec("ALTER TABLE {$table} DROP CONSTRAINT {$fkey}");
         }
         $aIndexes = array(OA_phpAdsNew::phpPgAdsPrefixedIndex('acls_bannerid_idx', $prefix) => 'acls_bannerid', OA_phpAdsNew::phpPgAdsPrefixedIndex('acls_bannerid_executionorder_udx', $prefix) => 'acls_bannerid_executionorder', OA_phpAdsNew::phpPgAdsPrefixedIndex('acls_bannerid_idx', $prefix) => 'acls_bannerid', OA_phpAdsNew::phpPgAdsPrefixedIndex('adclicks_bid_date_idx', $prefix) => 'adclicks_bannerid_date', OA_phpAdsNew::phpPgAdsPrefixedIndex('adclicks_date_idx', $prefix) => 'adclicks_date', OA_phpAdsNew::phpPgAdsPrefixedIndex('adclicks_zoneid_idx', $prefix) => 'adclicks_zoneid', OA_phpAdsNew::phpPgAdsPrefixedIndex('adstats_bid_day_idx', $prefix) => 'adstats_bannerid_day', OA_phpAdsNew::phpPgAdsPrefixedIndex('adstats_zoneid_idx', $prefix) => 'adstats_zoneid', OA_phpAdsNew::phpPgAdsPrefixedIndex('adviews_bid_date_idx', $prefix) => 'adviews_bannerid_date', OA_phpAdsNew::phpPgAdsPrefixedIndex('adviews_date_idx', $prefix) => 'adviews_date', OA_phpAdsNew::phpPgAdsPrefixedIndex('adviews_zoneid_idx', $prefix) => 'adviews_zoneid', OA_phpAdsNew::phpPgAdsPrefixedIndex('zones_zonename_zoneid_idx', $prefix) => 'zones_zonenameid');
         foreach ($aIndexes as $oldIndex => $newIndex) {
             $result = $this->oUpgrade->oDbh->exec("ALTER INDEX {$oldIndex} RENAME TO {$prefix}{$newIndex}");
         }
         $aFunctions = array('unix_timestamp(timestamptz)', 'from_unixtime(int4)', 'to_days(timestamptz)', 'dayofmonth(timestamptz)', 'month(timestamptz)', 'year(timestamptz)', 'week(timestamptz)', 'hour(timestamptz)', 'date_format(timestamptz, text)', 'if(bool, varchar, varchar)');
         foreach ($aFunctions as $function) {
             $result = $this->oUpgrade->oDbh->exec("DROP FUNCTION {$function}");
         }
         OA_DB::createFunctions();
     }
     return true;
 }