Verify Bufferpool - (DB2 Bufferpool)

Bufferpools are an important aspect of DB2 database performance because they store recently accessed data in memory, reducing the need for frequent disk I/O operations. In order to ensure that bufferpools are operating effectively, it is important to periodically verify and adjust their settings.

Syntax

The syntax for verifying bufferpools in DB2 is as follows:

SELECT BPNAME, DBPGNAME, BP_CUR_BUFFSZ, BP_DATA_PROTECT, BP_MAX_BUFFSZ, BP_POOL_CUR_SIZE,
  BP_POOL_MAX_SIZE, BP_PAGE_SIZE, BP_CONFIG, BP_PARTSEGS, BP_SETSIZE, CAST(BP_USED_PERCENT AS INTEGER) AS BP_USED_PERCENT
FROM SYSIBM.SYSCOPY
WHERE QNAME = 'DSN8D18'; -- Replace with the name of the bufferpool being verified

Example

SELECT BPNAME, DBPGNAME, BP_CUR_BUFFSZ, BP_DATA_PROTECT, BP_MAX_BUFFSZ, BP_POOL_CUR_SIZE,
  BP_POOL_MAX_SIZE, BP_PAGE_SIZE, BP_CONFIG, BP_PARTSEGS, BP_SETSIZE, CAST(BP_USED_PERCENT AS INTEGER) AS BP_USED_PERCENT
FROM SYSIBM.SYSCOPY
WHERE QNAME = 'DB2BP2';

In this example, we are verifying the settings for a bufferpool named DB2BP2. The SYSIBM.SYSCOPY table is being queried to retrieve information about the bufferpool settings, including the name of the bufferpool, the current buffer size, the maximum buffer size, the page size, and the percentage of the bufferpool that is currently being used.

Output

The output of this query will be a list of the bufferpool settings that have been retrieved from the SYSIBM.SYSCOPY table. The specific output will depend on the settings of the bufferpool being verified.

Explanation

The SYSIBM.SYSCOPY table is a system catalog table in DB2 that includes information about bufferpools and other database objects. By querying the SYSIBM.SYSCOPY table with the appropriate filter criteria, we can retrieve information about the settings of a specific bufferpool, such as the current buffer size, the maximum buffer size, and the percentage of the bufferpool that is being used.

Use

Verifying bufferpools in DB2 is an important aspect of database performance management. By periodically checking the settings of bufferpools and adjusting them as needed, we can ensure that the database is functioning efficiently and effectively.

Important Points

• Bufferpools are an important aspect of DB2 database performance.
• The SYSIBM.SYSCOPY table can be used to retrieve information about bufferpool settings.
• Verifying bufferpools and adjusting their settings as needed can help to ensure optimal database performance.

Summary

In summary, verifying bufferpools in DB2 is an important aspect of database performance management. Using the SYSIBM.SYSCOPY table to retrieve information about bufferpool settings can help to ensure that the database is functioning efficiently and effectively. By periodically checking and adjusting bufferpool settings, we can optimize database performance and ensure that our applications are running smoothly.