Index: branches/version-2/html/install/sql/add/dtb_session_mysql.sql
===================================================================
--- branches/version-2/html/install/sql/add/dtb_session_mysql.sql	(revision 15079)
+++ branches/version-2/html/install/sql/add/dtb_session_mysql.sql	(revision 18007)
@@ -5,2 +5,3 @@
     update_date datetime NOT NULL
 ) TYPE=InnoDB;
+CREATE INDEX dtb_session_sess_id_key ON dtb_session (sess_id(32));
Index: branches/version-2/html/install/sql/add/dtb_session_pgsql.sql
===================================================================
--- branches/version-2/html/install/sql/add/dtb_session_pgsql.sql	(revision 15079)
+++ branches/version-2/html/install/sql/add/dtb_session_pgsql.sql	(revision 18007)
@@ -5,2 +5,3 @@
     update_date timestamp NOT NULL
 );
+CREATE INDEX dtb_session_sess_id_key ON dtb_session (sess_id);