What reasons would it take for the simple insert described below to take so long that it even timeout the server?
INSERT INTO wkvmk_postmeta (post_id, meta_key, meta_value) VALUES(904, '_order_key', '')
Table structure:
+------------+---------------------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+------------+---------------------+------+-----+---------+----------------+
| meta_id | bigint(20) unsigned | NO | PRI | NULL | auto_increment |
| post_id | bigint(20) unsigned | NO | MUL | 0 | |
| meta_key | varchar(255) | YES | MUL | NULL | |
| meta_value | longtext | YES | | NULL | |
+------------+---------------------+------+-----+---------+----------------+
Number of records already recorded: 5729
Server type: MariaDB
Server version: 10.0.24-MariaDB - MariaDB Server
Protocol version: 10
Error message: ERROR 1205 (HY000): Lock wait timeout exceeded; try restarting transaction
Doing insert directly with a client in the console ( mariadb-client-10.0 )