#### 27.12.3.1 The cond\_instances Table

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 The [`cond_instances`](performance-schema-cond-instances-table.html) table lists all the conditions seen by the Performance Schema while the server executes. A condition is a synchronization mechanism used in the code to signal that a specific event has happened, so that a thread waiting for this condition can resume work.

 When a thread is waiting for something to happen, the condition name is an indication of what the thread is waiting for, but there is no immediate way to tell which other thread, or threads, causes the condition to happen.

 The [`cond_instances`](performance-schema-cond-instances-table.html) table has these columns:

* `NAME`

   The instrument name associated with the condition.

* `OBJECT_INSTANCE_BEGIN`

   The address in memory of the instrumented condition.

 The [`cond_instances`](performance-schema-cond-instances-table.html) table has these indexes:

* Primary key on (`OBJECT_INSTANCE_BEGIN`)

* Index on (`NAME`)

[`TRUNCATE TABLE`](truncate-table.html) is not permitted for the [`cond_instances`](performance-schema-cond-instances-table.html) table.

