После запуска update.php выдает:
user warning: Duplicate key name 'pid' query: ALTER TABLE comments ADD INDEX pid (pid) in /hsphere/local/home/site.ru/includes/database.mysql-common.inc on line 434.

The following queries were executed
system module
Update #6047
UPDATE {blocks} SET cache = -1 WHERE module = 'user' AND delta IN ('0', '1')
UPDATE {blocks} SET cache = -1 WHERE module = 'system' AND delta = '0'
comment module
Update #6003
Failed: ALTER TABLE {comments} ADD INDEX pid (pid)