DB2 Version 9.7 for Linux, UNIX, and Windows

SNAPFCM administrative view and SNAP_GET_FCM table function - Retrieve the fcm logical data group snapshot information

The SNAPFCM administrative view and the SNAP_GET_FCM table function return information about the fast communication manager from a database manager snapshot, in particular, the fcm logical data group.

SNAPFCM administrative view

Used with the SNAPDBM, SNAPDBM_MEMORY_POOL, SNAPFCM_PART and SNAPSWITCHES administrative views, the SNAPFCM administrative view provides the data equivalent to the GET SNAPSHOT FOR DBM 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 SNAPFCM administrative view
CONTROL privilege on the SNAPFCM administrative view
DATAACCESS authority

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

EXECUTE privilege on the SNAP_GET_FCM 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 information about the fast communication manager's message buffers on all database partitions.

SELECT BUFF_FREE, BUFF_FREE_BOTTOM, DBPARTITIONNUM
    FROM SYSIBMADM.SNAPFCM ORDER BY DBPARTITIONNUM

The following example is a sample output from this query.

BUFF_FREE        BUFF_FREE_BOTTOM     DBPARTITIONNUM
---------...---- -------------------- --------------
            5120                 5100              0
            5120                 5100              1
            5120                 5100              2

SNAP_GET_FCM table function

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

Used with the SNAP_GET_DBM_V95, SNAP_GET_DBM_MEMORY_POOL, SNAP_GET_FCM_PART and SNAP_GET_SWITCHES table functions, the SNAP_GET_FCM table function provides the data equivalent to the GET SNAPSHOT FOR DBM command.

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

Syntax


>>-SNAP_GET_FCM--(--+----------------+--)----------------------><
                    '-dbpartitionnum-'

The schema is SYSPROC.

Table function parameter

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 this input option is not used, data will be 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 dbpartitionnum is 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_FCM 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_FCM 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 information about the fast communication manager's message buffers on database partition 1.

SELECT BUFF_FREE, BUFF_FREE_BOTTOM, DBPARTITIONNUM 
   FROM TABLE(SYSPROC.SNAP_GET_FCM( 1 )) AS T

The following example is a sample output from this query.

BUFF_FREE            BUFF_FREE_BOTTOM     DBPARTITIONNUM
-------------------- -------------------- --------------
                5120                 5100              1

Information returned

Table 1. Information returned by the SNAPFCM administrative view and the SNAP_GET_FCM table function
Column name	Data type	Description or corresponding monitor element
SNAPSHOT_TIMESTAMP	TIMESTAMP	snapshot_timestamp - Snapshot timestamp monitor element
BUFF_FREE	BIGINT	buff_free - FCM buffers currently free
BUFF_FREE_BOTTOM	BIGINT	buff_free_bottom - Minimum FCM Buffers Free
CH_FREE	BIGINT	ch_free - Channels Currently Free
CH_FREE_BOTTOM	BIGINT	ch_free_bottom - Minimum Channels Free
DBPARTITIONNUM	SMALLINT	The database partition from which the data was retrieved for this row.