HP 3000 Manuals

HP IMAGE/SQL Administration Guide

Definition 
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A transaction is a unit of work consisting of one or more SQL statements
referencing one or more databases in a DBEnvironment.  Work done within a
transaction can be committed (made permanent) or undone (rolled back).  A
transaction is started with an implicit or explicit BEGIN WORK statement
and is either committed with COMMIT WORK or rolled back with ROLLBACK
WORK.

An IMAGE/SQL transaction is started by the first SQL statement that
results in a modification or repeatable read of an IMAGE/SQL table.[REV
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MPE/iX 5.0 Documentation