Here are three top concurrency problems in DB2. So DB2 use locking mechanism to avoid these.
DB2 Concurrency Problems
- Lost updates- Two processes A and B Accessing same row. A is updated the row, and then B also updates the same row. So A ‘s updates are lost.
- Dirty Read – Accessing data which is not committed
- Unrepeatable read- without concurrency causes you to get different data each time you read.
Because of all the above reasons, DB2 apply Locks on the resources.
The MSGCLASS and MSGLEVEL control the print of messages to the output listing. Here are the detailed meanings and default values.
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