DB2 Version 10.1 for Linux, UNIX, and Windows

SNAPBP_PART administrative view and SNAP_GET_BP_PART table function - Retrieve bufferpool_nodeinfo logical data group snapshot information

The SNAPBP_PART administrative view and the SNAP_GET_BP_PART table function return information about buffer pools from a bufferpool snapshot, in particular, the bufferpool_nodeinfo logical data group.

Depending on if you are using the administrative view or the table function, refer to one of the following sections:

SNAPBP_PART administrative view
SNAP_GET_BP_PART table function

SNAPBP_PART administrative view

This administrative view allows you to retrieve bufferpool_nodeinfo logical data group snapshot information for the currently connected database.

Used with the SNAPBP administrative view, the SNAPBP_PART administrative view provides the data equivalent to the GET SNAPSHOT FOR BUFFERPOOLS 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 to use the view:

SELECT privilege on the SNAPBP_PART administrative view
CONTROL privilege on the SNAPBP_PART administrative view
DATAACCESS authority
DBADM authority
SQLADM authority

One of the following is required to use the table function:

EXECUTE privilege on the SNAP_GET_BP_PART table function
DATAACCESS authority
DBADM authority
SQLADM authority

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

SYSMON
SYSCTRL
SYSMAINT
SYSADM

Default PUBLIC privilege

In a non-restrictive database, SELECT privilege is granted to PUBLIC when the view is automatically created.

Example

Retrieve data for all bufferpools when connected to SAMPLE database.

SELECT SUBSTR(DB_NAME,1,8) AS DB_NAME, SUBSTR(BP_NAME,1,15) AS BP_NAME, 
   BP_CUR_BUFFSZ, BP_NEW_BUFFSZ, BP_PAGES_LEFT_TO_REMOVE, BP_TBSP_USE_COUNT 
   FROM SYSIBMADM.SNAPBP_PART

The following is an example of output from this query.

DB_NAME  BP_NAME         BP_CUR_BUFFSZ        BP_NEW_BUFFSZ        ...
-------- --------------- -------------------- -------------------- ...
SAMPLE   IBMDEFAULTBP                    1000                 1000 ...
SAMPLE   IBMSYSTEMBP4K                     16                   16 ...
SAMPLE   IBMSYSTEMBP8K                     16                   16 ...
SAMPLE   IBMSYSTEMBP16K                    16                   16 ...
                                                                   ...
  4 record(s) selected.

Output from this query (continued).

... BP_PAGES_LEFT_TO_REMOVE BP_TBSP_USE_COUNT     
... ----------------------- --------------------  
...                       0                    3  
...                       0                    0  
...                       0                    0  
...                       0                    0  
...

SNAP_GET_BP_PART table function

The SNAP_GET_BP_PART table function returns the same information as the SNAPBP_PART administrative view, but allows you to retrieve the information for a specific database on a specific database member, aggregate of all database members or all database members.

Used with the SNAP_GET_BP table function, the SNAP_GET_BP_PART table function provides the data equivalent to the GET SNAPSHOT FOR ALL BUFFERPOOLS CLP command.

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

Syntax


>>-SNAP_GET_BP_PART--(--dbname--+----------+--)----------------><
                                '-, member-'

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 for all bufferpools in all databases within the same instance as the currently connected database.
member: An optional input argument of type INTEGER that specifies a valid database member number. Specify -1 for the current database member, or -2 for an aggregate of all active database members. If dbname is not set to NULL and member is set to NULL, -1 is set implicitly for member. If this input option is not used, that is, only dbname is provided, data is returned from all active database members. An active database member is a member where the database is available for connection and use by applications.

If both dbname and member 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_BP_PART table function takes a snapshot for the currently connected database and database member number.

Authorization

One of the following authorizations is required:

EXECUTE privilege on the SNAP_GET_BP_PART table function
DATAACCESS authority

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

SYSMON
SYSCTRL
SYSMAINT
SYSADM

Default PUBLIC privilege

In a non-restrictive database, EXECUTE privilege is granted to PUBLIC when the function is automatically created.

Example

Retrieve data for all bufferpools for all active databases when connected to the SAMPLE database.

SELECT SUBSTR(DB_NAME,1,8) AS DB_NAME, SUBSTR(BP_NAME,1,15) AS BP_NAME, 
   BP_CUR_BUFFSZ, BP_NEW_BUFFSZ, BP_PAGES_LEFT_TO_REMOVE, BP_TBSP_USE_COUNT 
   FROM TABLE(SNAP_GET_BP_PART(CAST(NULL AS VARCHAR(128)),-1)) AS T

The following is an example of output from this query.

DB_NAME  BP_NAME         BP_CUR_BUFFSZ        BP_NEW_BUFFSZ        ...
-------- --------------- -------------------- -------------------- ...
SAMPLE   IBMDEFAULTBP                     250                  250 ...
SAMPLE   IBMSYSTEMBP4K                     16                   16 ...
SAMPLE   IBMSYSTEMBP8K                     16                   16 ...
SAMPLE   IBMSYSTEMBP16K                    16                   16 ...
SAMPLE   IBMSYSTEMBP32K                    16                   16 ...
TESTDB   IBMDEFAULTBP                     250                  250 ...
TESTDB   IBMSYSTEMBP4K                     16                   16 ...
TESTDB   IBMSYSTEMBP8K                     16                   16 ...
TESTDB   IBMSYSTEMBP16K                    16                   16 ...
TESTDB   IBMSYSTEMBP32K                    16                   16 ...

...

Output from this query (continued).

... BP_PAGES_LEFT_TO_REMOVE BP_TBSP_USE_COUNT    
... ----------------------- -------------------- 
...                       0                    3 
...                       0                    0 
...                       0                    0 
...                       0                    0 
...                       0                    0 
...                       0                    3 
...                       0                    0 
...                       0                    0 
...                       0                    0 
...                       0                    0 

...

Information returned

Table 1. Information returned by the SNAPBP_PART administrative view and the SNAP_GET_BP_PART table function
Column name	Data type	Description or corresponding monitor element
SNAPSHOT_TIMESTAMP	TIMESTAMP	The date and time that the snapshot was taken.
BP_NAME	VARCHAR(128)	bp_name - Buffer pool name
DB_NAME	VARCHAR(128)	db_name - Database name
BP_CUR_BUFFSZ	BIGINT	bp_cur_buffsz - current size of buffer pool
BP_NEW_BUFFSZ	BIGINT	bp_new_buffsz - New buffer pool size
BP_PAGES_LEFT_TO_REMOVE	BIGINT	bp_pages_left_to_remove - Number of pages left to remove
BP_TBSP_USE_COUNT	BIGINT	bp_tbsp_use_count - Number of table spaces mapped to buffer pool
DBPARTITIONNUM	SMALLINT	dbpartitionnum - Database partition number monitor element
MEMBER	SMALLINT	member - Database member monitor element