List currently open tables. View the database, table name, and lock status for tables in the table cache.
SHOW OPEN TABLES lists the non-TEMPORARY tables that are currently open in the table cache. See .
The FROM and LIKE clauses may be used.
The FROM clause, if present, restricts the tables shown to those present in thedb_name database.
The LIKE clause, if present on its own, indicates which table names to match. The WHERE and LIKE clauses can be given to select rows using more general conditions, as discussed in .
The following information is returned:
LOCK TABLE... WRITE acquires a strong MDL lock, and concurrent connections will wait on this MDL lock, so any subsequent LOCK TABLE... WRITE will not increment In_use.
Before , each use of, for example, would increment In_use for that table. With the implementation of the metadata locking improvements in MariaDB 5.5, LOCK TABLE... WRITE acquires a strong MDL lock, and concurrent connections will wait on this MDL lock, so any subsequent LOCK TABLE... WRITE will not increment In_use.
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SHOW OPEN TABLES [FROM db_name]
[LIKE 'pattern' | WHERE expr]Database
Database name.
Name
Table name.
In_use
Number of table instances being used.
Name_locked
1 if the table is name-locked, e.g. if it is being dropped or renamed, otherwise 0.
SHOW OPEN TABLES;
+----------+---------------------------+--------+-------------+
| Database | Table | In_use | Name_locked |
+----------+---------------------------+--------+-------------+
...
| test | xjson | 0 | 0 |
| test | jauthor | 0 | 0 |
| test | locks | 1 | 0 |
...
+----------+---------------------------+--------+-------------+