1. Question: What is IBM Db2?
- Answer: IBM Db2
is a family of data management products, including database servers, developed
by IBM. Db2 is a relational database management system (RDBMS) that provides
robust features for managing and storing data.
2. Question: Explain the difference between Db2 LUW (Linux,
Unix, Windows) and Db2 z/OS (Mainframe).
- Answer: Db2 LUW
is designed for distributed systems like Linux, Unix, and Windows, while Db2
z/OS is designed for IBM mainframe systems. The architecture, features, and
management of these versions differ to meet the requirements of their
respective environments.
3. Question: What is a Db2 tablespace?
- Answer: A Db2
tablespace is a container for storing tables, indexes, and other database
objects. It is a logical storage structure that maps to physical storage on
disk.
4. Question: What is the purpose of the Db2 Catalog and
Directory?
- Answer: The Db2
Catalog contains metadata about the database, such as tables, indexes, and
privileges. The Db2 Directory contains information about the physical layout of
the database, including tablespaces and storage groups.
5. Question: How does Db2 handle transactions, and what is a
Db2 commit statement?
- Answer: Db2 uses
a two-phase commit protocol for transactions. The COMMIT statement in Db2 is
used to save the changes made during a transaction permanently.
6. Question: What is the Db2 Buffer Pool?
- Answer: The Db2
Buffer Pool is a memory area used to cache data pages and index pages. It helps
in reducing the need for frequent disk I/O by keeping frequently accessed data
in memory.
7. Question: Explain the purpose of the Db2 Lock Manager.
- Answer: The Db2
Lock Manager is responsible for managing locks to ensure data integrity and
consistency in a multi-user environment. It coordinates the locking of
resources to prevent conflicts between concurrent transactions.
8. Question: What is Db2 SQL PL?
- Answer: Db2 SQL
PL (Procedural Language) is a procedural language extension to SQL. It allows
developers to write stored procedures, functions, triggers, and other
procedural code within Db2 databases.
9. Question: How does Db2 support high availability and
disaster recovery?
- Answer: Db2
supports features like HADR (High Availability Disaster Recovery) to ensure
high availability. HADR involves creating a standby database that can take over
in case the primary database fails.
10. Question: What is the Db2 Explain feature, and how does
it help in query optimization?
- Answer: The Db2
Explain feature is used to analyze the access plan for a SQL statement. It
provides information about how Db2 will execute the statement, helping in query
performance tuning. Developers can use the EXPLAIN statement to get insights
into the execution plan.
