There are two options:
- there are too many rows in those tables (common for sessions table, uncommon for coupon_gv_queuetable)
- table structure is damaged (common error for all tables)
Log in to phpmyadmin or similar tool and execute:
PHP Code:
TRUNCATE table sessions;
REPAIR TABLE sessions;
REPAIR TABLE coupon_gv_queuetable;
Should work. If it won't help execute also:
PHP Code:
SELECT count(*) FROM coupon_gv_queuetable;
And write here how many rows this table has. You can also execute
PHP Code:
SHOW CREATE TABLE coupon_gv_queuetable;
and copy it here.
If it does help consider switching to innodb tables (especially in case of sessions table).