The cond_instances table, along with many other new Performance Schema tables, was added in MariaDB 10.0
The cond_instances table lists all conditions while the server is executing. A condition, or instrumented condition object, is an internal code mechanism used for signalling that a specific event has occurred so that any threads waiting for this condition can continue.
The maximum number of conditions stored in the performance schema is determined by the performance_schema_max_cond_instances system variable.
| Column | Description |
|---|---|
NAME |
Client user name for the connection, or NULL if an internal thread. |
OBJECT_INSTANCE_BEGIN |
Address in memory of the instrumented condition. |
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https://mariadb.com/kb/en/performance-schema-cond_instances-table/