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A pseudo table generated to show information about all transactional locks currently acquired in the database. If there are multiple Transaction Engines (TEs) running in the domain, this table shows a view of all transactional locks currently running from each TE. In other words, each transactional lock will be shown multiple times in this pseudo table, once for each TE running in the domain. For example, If there are four TEs, each lock will show in this table four times, each row representing a view of that transactional lock from each one of the four TEs. This is the intended behavior.
SOURCENODE column in this table specifies the TE from where this lock held is being reported, but not necessarily the TE where the transaction is executing.
NODEID column in this table specifies the TE on which the transaction owning the lock is currently running. This value for a given transaction does not change.
Caution: Client applications should never contain code that accesses
SYSTEM pseudo tables as they are subject to, and furthermore likely to, change from release to release.
|OBJECTID||integer||A unique ID identifying the database object.|
|TRANSACTIONID||bigint||The identifier of the transaction owning the lock.|
The Identifier of the TE where this transaction is running.
The type of lock to be set (
Note: At the time of writing, NuoDB 3.2.2 does not support the acquiring of
SELECT * FROM system.transactionallocks;==================================== Row #1 ==================================== OBJECTID: 72 TRANSID: 2050 NODEID: 2 LOCKTYPE: Shared SOURCENODE: 2 ==================================== Row #2 ==================================== OBJECTID: 70 TRANSID: 898 NODEID: 2 LOCKTYPE: Exclusive SOURCENODE: 2 ==================================== Row #3 ==================================== OBJECTID: 70 TRANSID: 898 NODEID: 2 LOCKTYPE: Exclusive SOURCENODE: 3