LOCK CLUSTER WITH

Description

The LOCK CLUSTER WITH syntax is utilized to apply a lock with a specific algorithm to the CLUSTER.

Syntax

LockClusterWith ::=
  'LOCK' 'CLUSTER' 'WITH' lockStrategy ('TIMEOUT' timeoutMillis)?

timeoutMillis ::=
  long

Supplement

• When the CLUSTER is already locked, it is impossible to re-lock it, otherwise an exception will be thrown.
• Currently, the lockStrategy supports two lock strategies, namely the exclusive lock WRITE and the read-write lock READ_WRITE .
• The timeoutMillis is used to indicate the timeout period for attempting to acquire the lock, with the unit being milliseconds. When not specified, the default value is 3,000 milliseconds.

Example

• Lock the CLUSTER with an exclusive lock without setting the timeout.

LOCK CLUSTER WITH WRITE;

• Lock the CLUSTER with a read-write lock and set the timeout to 2000 milliseconds.

LOCK CLUSTER WITH READ_WRITE TIMEOUT 2000;

Reserved word

LOCK,CLUSTER,WITH

Related links

• Reserved word