A database is said to have or use transaction logging, when SQL data manipulation statements in a database generate [[[logical log]] records.
The database logging status indicates whether a database uses transaction logging.
A transaction log is maintained by SE, recording all changes made to the database. This log is cleared and restarted fresh after you make a backup on the database. If a crash occurs and some recent data is lost, you must restore the last backup and then apply the last transaction log
How to start a transaction log
As user informix, run on command prompt:
ontape -s -L 0 -U <database name>