DB2 Version 9.7 for Linux, UNIX, and Windows

SNAPHADR administrative view and SNAP_GET_HADR table function - Retrieve hadr logical data group snapshot information

The SNAPHADR administrative view and the SNAP_GET_HADR table function return information about high availability disaster recovery from a database snapshot, in particular, the hadr logical data group.

SNAPHADR administrative view

This administrative view allows you to retrieve hadr logical data group snapshot information for the currently connected database. The data is only returned by this view if the database is a primary or standby high availability disaster recovery (HADR) database.

Used with the SNAPDB, SNAPDB_MEMORY_POOL, SNAPDETAILLOG and SNAPSTORAGE_PATHS administrative views, the SNAPHADR administrative view provides information equivalent to the GET SNAPSHOT FOR DATABASE 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 SNAPHADR administrative view
CONTROL privilege on the SNAPHADR administrative view
DATAACCESS authority

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

EXECUTE privilege on the SNAP_GET_HADR 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 the configuration and status information for HADR on the primary HADR database.

SELECT SUBSTR(DB_NAME, 1, 8) AS DBNAME, HADR_ROLE, HADR_STATE, 
   HADR_SYNCMODE, HADR_CONNECT_STATUS 
   FROM SYSIBMADM.SNAPHADR

The following example is a sample output from this query.

DBNAME   HADR_ROLE HADR_STATE     HADR_SYNCMODE HADR_CONNECT_STATUS
-------- --------- -------------- ------------- -------------------
SAMPLE   PRIMARY   PEER           SYNC          CONNECTED

  1 record(s) selected.

SNAP_GET_HADR table function

The SNAP_GET_HADR table function returns the same information as the SNAPHADR 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_DB_V95, SNAP_GET_DB_MEMORY_POOL, SNAP_GET_DETAILLOG_V91 and SNAP_GET_STORAGE_PATHS table functions, the SNAP_GET_HADR table function provides information equivalent to the GET SNAPSHOT FOR ALL DATABASES CLP command.

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

Syntax


>>-SNAP_GET_HADR--(--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_HADR 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_HADR 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 the configuration and status information for HADR for all databases.

SELECT SUBSTR(DB_NAME, 1, 8) AS DBNAME, HADR_ROLE, HADR_STATE, 
   HADR_SYNCMODE, HADR_CONNECT_STATUS 
   FROM TABLE (SNAP_GET_HADR (CAST (NULL as VARCHAR(128)), 0)) as T

The following example is a sample output from this query.

DBNAME   HADR_ROLE HADR_STATE     HADR_SYNCMODE HADR_CONNECT_STATUS
-------- --------- -------------- ------------- -------------------
SAMPLE   PRIMARY   PEER           SYNC          CONNECTED
TESTDB   PRIMARY   DISCONNECTED   NEARSYNC      DISCONNECTED 

2 record(s) selected.

Information returned

Table 1. Information returned by the SNAPHADR administrative view and the SNAP_GET_HADR 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
HADR_ROLE	VARCHAR(10)	hadr_role - HADR role . This interface returns a text identifier based on the defines in sqlmon.h, and is one of: PRIMARY STANDARD STANDBY
HADR_STATE	VARCHAR(14)	hadr_state - HADR state . This interface returns a text identifier based on the defines in sqlmon.h, and is one of: DISCONNECTED LOCAL_CATCHUP PEER REM_CATCH_PEN REM_CATCHUP
HADR_SYNCMODE	VARCHAR(10)	hadr_syncmode - HADR synchronization mode . This interface returns a text identifier based on the defines in sqlmon.h, and is one of: ASYNC NEARSYNC SUPERASYNC SYNC
HADR_CONNECT_STATUS	VARCHAR(12)	hadr_connect_status - HADR connection status . This interface returns a text identifier based on the defines in sqlmon.h, and is one of: CONGESTED CONNECTED DISCONNECTED
HADR_CONNECT_TIME	TIMESTAMP	hadr_connect_time - HADR connection time
HADR_HEARTBEAT	INTEGER	hadr_heartbeat - HADR heartbeat
HADR_LOCAL_HOST	VARCHAR(255)	hadr_local_host - HADR local host
HADR_LOCAL_SERVICE	VARCHAR(40)	hadr_local_service - HADR local service
HADR_REMOTE_HOST	VARCHAR(255)	hadr_remote_host - HADR remote host
HADR_REMOTE_SERVICE	VARCHAR(40)	hadr_remote_service - HADR remote service
HADR_REMOTE_INSTANCE	VARCHAR(128)	hadr_remote_instance - HADR remote instance
HADR_TIMEOUT	BIGINT	hadr_timeout - HADR timeout
HADR_PRIMARY_LOG_FILE	VARCHAR(255)	hadr_primary_log_file - HADR primary log file
HADR_PRIMARY_LOG_PAGE	BIGINT	hadr_primary_log_page - HADR primary log page
HADR_PRIMARY_LOG_LSN	BIGINT	hadr_primary_log_lsn - HADR primary log LSN
HADR_STANDBY_LOG_FILE	VARCHAR(255)	hadr_standby_log_file - HADR standby log file
HADR_STANDBY_LOG_PAGE	BIGINT	hadr_standby_log_page - HADR standby log page
HADR_STANDBY_LOG_LSN	BIGINT	hadr_standby_log_lsn - HADR standby log LSN
HADR_LOG_GAP	BIGINT	hadr_log_gap - HADR log gap
DBPARTITIONNUM	SMALLINT	The database partition from which the data was retrieved for this row.