ID Number: Q62873
1.10 1.11 4.20
OS/2
Summary:
The following information describes some considerations for backing
up or restoring databases:
1. When using log backups in combination with database backups, make
sure you never truncate the log with either DUMP TRANSACTION WITH
TRUNCATE_ONLY or TRUNCATE LOG ON CHECKPOINT. Any log backups
following the truncation of the log are invalid and will generate
an "out of sequence" error when restoring the transaction logs.
DUMP TRANSACTION has its own form of syslogs truncation. Therefore,
it is important that each transaction dump is dumped onto a
separate device, and that all are stored and restored in the same
order.
2. When only dumping databases, the transaction log must be truncated
to keep it from becoming unnecessarily large because DUMP
TRANSACTION does not truncate the log. In this instance, you
should use TRUNCATE LOG ON CHECKPOINT.
Method 1 should be used for large databases so the whole database does
not always need to be backed up. Method 2 is better suited for small
databases.
Additional reference words: Dumping and loading