RMUDISPLAY72.HLB  —  Overview  Fields  Locking locks requested screen , TSNBLK locks field
    This field gives statistics for the database transaction block
    (TSNBLK) locks. The TSNBLK locks control the COMMIT and ROLLBACK
    operations on each VMScluster node. TSNBLK locks are also
    used to control SQL SET TRANSACTION statements for read-only
    transactions.
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