January 2005
Beginner to intermediate
928 pages
22h 14m
English
book
Understanding DB2®: Learning Visually with Examples
by Raul F. Chong, Clara Liu, Sylvia F. Qi, Dwaine R. Snow
Content preview from Understanding DB2®: Learning Visually with Examples
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Chapter 11
| A1: | Increasing MAXLOCKS (the percentage of the lock list that an application can use before escalation occurs) and increasing LOCKLIST can reduce the chances of getting lock escalations. | ||||||
| A2: | When a user performs a read operation, by default DB2 attempts to lock the rows with share locks. Once a share lock is acquired, concurrent users will not be able to make changes to the rows. However, concurrent read is allowed. In this example, Sam may have set the isolation level as UR, so DB2 will not acquire any row lock. This may result in uncommitted data within the same transaction as described here. | ||||||
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