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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 );