Session table definition
CREATE TABLE php_session ( sess_id text, sess_name text, sess_data text, sess_created integer, sess_modified integer, sess_expire integer, sess_addr_created text, sess_addr_modified text, sess_counter integer, sess_error integer, sess_warning integer, sess_notice integer, sess_err_message text, sess_custom text ); CREATE INDEX php_session_idx ON php_session USING BTREE (sess_id);
If you use HASH for INDEX, you'll have a deadlock problem when the server load is very high. Even if it's unlikely to have a deadlock under normal operation, it can occur. Do not use HASH for INDEX.
You may change the session table as long as all fields are defined.
Application variables table definition
CREATE TABLE php_app_vars ( app_modified integer, app_name text, app_vars text );