IBM DB2 面试题与答案
问题 21. Explain the purpose of the db2diag.log file in DB2.
The db2diag.log file contains diagnostic information about the database manager and its associated processes. It is used for troubleshooting and monitoring.
问题 22. What is the purpose of the RUNTIMESTATS option in DB2?
The RUNTIMESTATS option is used to collect runtime statistics for SQL statements, providing information about resource usage during query execution.
问题 23. How can you monitor and optimize locking in DB2?
Locking can be monitored using tools like db2pd and improved by using proper isolation levels, avoiding long-running transactions, and optimizing SQL queries.
问题 24. Explain the role of the db2ckpwd utility in DB2.
The db2ckpwd utility checks the strength of user passwords in DB2, helping to enforce security policies and prevent weak passwords.
问题 25. What is a correlated subquery in DB2?
A correlated subquery is a subquery that refers to columns from the outer query. It is executed once for each row processed by the outer query.
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