Function of the DEADLOCK_TIMEOUT parameter

If a distributed transaction is forced to wait longer than the number of seconds specified by DEADLOCK_TIMEOUT for a shared-memory resource, the thread that owns the transaction assumes that a multiserver deadlock exists. The following error message is returned:
-154 ISAM error: deadlock timeout expired - Possible deadlock. 

The default value of DEADLOCK_TIMEOUT is 60 seconds. Adjust this value carefully. If you set it too low, individual database servers end transactions that are not deadlocks. If you set it too high, multiserver deadlocks might reduce concurrency.

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