DB2 Version 9.7 for Linux, UNIX, and Windows

SNAPAGENT_MEMORY_POOL administrative view and SNAP_GET_AGENT_MEMORY_POOL table function - Retrieve memory_pool logical data group snapshot information

The SNAPAGENT_MEMORY_POOL administrative view and the SNAP_GET_AGENT_MEMORY_POOL table function return information about memory usage at the agent level.

Note: Starting in Version 9.7 Fix Pack 5, the SNAPAGENT_MEMORY_POOL administrative view and SNAP_GET_AGENT_MEMORY_POOL table function have been deprecated and replaced by the MON_GET_MEMORY_POOL table function - get memory pool information and MON_GET_MEMORY_SET table function - get memory set information.

SNAPAGENT_MEMORY_POOL administrative view

This administrative view allows you to retrieve the memory_pool logical data group snapshot information about memory usage at the agent level for the currently connected database.

Used with the SNAPAGENT, SNAPAPPL, SNAPAPPL_INFO, SNAPSTMT and SNAPSUBSECTION administrative views, the SNAPAGENT_MEMORY_POOL administrative view provides information equivalent to the GET SNAPSHOT FOR APPLICATIONS ON database-alias CLP command.

The schema is SYSIBMADM.

Refer to Table 1 for a complete list of information that can be returned.

Authorization

One of the following authorizations is required:

SELECT privilege on the SNAPAGENT_MEMORY_POOL administrative view
CONTROL privilege on the SNAPAGENT_MEMORY_POOL administrative view
DATAACCESS authority

In addition, one of the following privileges or authorities is also required:

EXECUTE privilege on the SNAP_GET_AGENT_MEMORY_POOL table function
DATAACCESS authority

In addition, to access snapshot monitor data, one of the following authorities is also required:

SYSMON
SYSCTRL
SYSMAINT
SYSADM

Example

Retrieve a list of memory pools and their current size.

SELECT AGENT_ID, POOL_ID, POOL_CUR_SIZE FROM SYSIBMADM.SNAPAGENT_MEMORY_POOL

The following example is a sample output from this query.

AGENT_ID       POOL_ID POOL_  CUR_SIZE
--------...--- -------------- ---------...------
            48 APPLICATION                 65536
            48 OTHER                       65536
            48 APPL_CONTROL                65536
            47 APPLICATION                 65536
            47 OTHER                      131072
            47 APPL_CONTROL                65536
            46 OTHER                      327680
            46 APPLICATION                262144
            46 APPL_CONTROL                65536

9 record(s) selected.

SNAP_GET_AGENT_MEMORY_POOL table function

The SNAP_GET_AGENT_MEMORY_POOL table function returns the same information as the SNAPAGENT_MEMORY_POOL administrative view, but allows you to retrieve the information for a specific database on a specific database partition, aggregate of all database partitions or all database partitions.

Used with the SNAP_GET_AGENT, SNAP_GET_APPL_V95, SNAP_GET_APPL_INFO_V95, SNAP_GET_STMT and SNAP_GET_SUBSECTION table functions, the SNAP_GET_AGENT_MEMORY_POOL table function provides information equivalent to the GET SNAPSHOT FOR ALL APPLICATIONS CLP command.

Refer to Table 1 for a complete list of information that can be returned.

Syntax


>>-SNAP_GET_AGENT_MEMORY_POOL--(--dbname--+------------------+--)-><
                                          '-, dbpartitionnum-'

The schema is SYSPROC.

Table function parameters

dbname: An input argument of type VARCHAR(128) that specifies a valid database name in the same instance as the currently connected database. Specify a database name that has a directory entry type of either "Indirect" or "Home", as returned by the LIST DATABASE DIRECTORY command. Specify an empty string to take the snapshot from the currently connected database. Specify a NULL value to take the snapshot from all databases within the same instance as the currently connected database.
dbpartitionnum: An optional input argument of type INTEGER that specifies a valid database partition number. Specify -1 for the current database partition, or -2 for an aggregate of all active database partitions. If dbname is not set to NULL and dbpartitionnum is set to NULL, -1 is set implicitly for dbpartitionnum. If this input option is not used, that is, only dbname is provided, data is returned from all active database partitions. An active database partition is a partition where the database is available for connection and use by applications.

If both dbname and dbpartitionnum are set to NULL, an attempt is made to read data from the file created by SNAP_WRITE_FILE procedure. Note that this file could have been created at any time, which means that the data might not be current. If a file with the corresponding snapshot API request type does not exist, then the SNAP_GET_AGENT_MEMORY_POOL table function takes a snapshot for the currently connected database and database partition number.

Authorization

One of the following authorizations is required:

EXECUTE privilege on the SNAP_GET_AGENT_MEMORY_POOL table function
DATAACCESS authority

In addition, to access snapshot monitor data, one of the following authorities is also required:

SYSMON
SYSCTRL
SYSMAINT
SYSADM

Example

Retrieve a list of memory pools and their current size for all databases.

SELECT SUBSTR(DB_NAME,1,8) AS DB_NAME, AGENT_ID, POOL_ID, POOL_CUR_SIZE 
   FROM TABLE(SNAP_GET_AGENT_MEMORY_POOL(CAST (NULL AS VARCHAR(128)), -1)) 
   AS T

The following example is a sample output from this query.

DB_NAME  AGENT_ID       POOL_ID        POOL_CUR_SIZE
-------- --------...--- -------------- --------------------
SAMPLE               48 APPLICATION                   65536
SAMPLE               48 OTHER                         65536
SAMPLE               48 APPL_CONTROL                  65536
SAMPLE               47 APPLICATION                   65536
SAMPLE               47 OTHER                        131072
SAMPLE               47 APPL_CONTROL                  65536
SAMPLE               46 OTHER                        327680
SAMPLE               46 APPLICATION                  262144
SAMPLE               46 APPL_CONTROL                  65536
TESTDB               30 APPLICATION                   65536
TESTDB               30 OTHER                         65536
TESTDB               30 APPL_CONTROL                  65536
TESTDB               29 APPLICATION                   65536
TESTDB               29 OTHER                        131072
TESTDB               29 APPL_CONTROL                  65536
TESTDB               28 OTHER                        327680
TESTDB               28 APPLICATION                   65536
TESTDB               28 APPL_CONTROL                  65536

18 record(s) selected.

Information returned

Table 1. Information returned by the SNAPAGENT_MEMORY_POOL administrative view and the SNAP_GET_AGENT_MEMORY_POOL table function
Column name	Data type	Description or corresponding monitor element
SNAPSHOT_TIMESTAMP	TIMESTAMP	snapshot_timestamp - Snapshot timestamp monitor element
DB_NAME	VARCHAR(128)	db_name - Database name
AGENT_ID	BIGINT	agent_id - Application handle (agent ID)
AGENT_PID	BIGINT	agent_pid - Engine dispatchable unit (EDU)
POOL_ID	VARCHAR(14)	pool_id - Memory pool identifier . This interface returns a text identifier based on defines in sqlmon.h, and is one of: APP_GROUP APPL_CONTROL APPLICATION BP CAT_CACHE DATABASE DFM FCMBP IMPORT_POOL LOCK_MGR MONITOR OTHER PACKAGE_CACHE QUERY SHARED_SORT SORT STATEMENT STATISTICS UTILITY
POOL_CUR_SIZE	BIGINT	pool_cur_size - Current size of memory pool
POOL_WATERMARK	BIGINT	pool_watermark - Memory pool watermark
POOL_CONFIG_SIZE	BIGINT	pool_config_size - Configured size of memory pool
DBPARTITIONNUM	SMALLINT	The database partition from which the data was retrieved for this row.