DB2® Version
9.5 introduced administrative views that provide an easy-to-use application
programming interface to DB2 administrative
functions through SQL.
The administrative views fall into three categories:
- Views based on catalog views.
- Views based on table functions with no input parameters.
- Views based on table functions with one or more input parameters.
The administrative views are the preferred and only documented
interfaces for the views based on catalog views and the views based
on table functions with no input parameters because the table functions
do not provide any additional information or performance benefits.
For administrative views based on table functions with
one or more input parameters, both the administrative view and the
table function can be used, each achieving a different goal:
- The ADMINTABINFO administrative view and the ADMIN_GET_TAB_INFO_V95
table function: The administrative view retrieves information for
all tables in the database. This can have a significant performance
impact for large databases. The performance impact can be reduced
by using the table function and specifying a schema name, table name,
or both as input.
- The PDLOGMSGS_LAST24HOURS administrative view and the PD_GET_LOG_MSGS
table function: The administrative view, which retrieves notification
log messages, provides quick access to data from the previous 24 hours,
whereas the table function allows you to retrieve data from a specified
period of time.
- All snapshot monitor administrative views and table functions
(SNAP* administrative views, SNAP_GET_* table functions): The snapshot
monitor administrative views provide access to data from each database
partition. The table functions provide the option to choose between
data from a single database partition or data aggregated across all
database partitions.
Applications that use the table functions instead of the
views might need to be changed because the table functions might change
from release to release to enable new information to be returned.
The new table function will have the same base name as the original
function and will be suffixed with '_Vxx' for the version of the product
in which it is added (for example, _V97). The administrative views
will always be based on the most current version of the table functions,
and therefore allow for more application portability. As the columns
may vary from one release to the next, it is recommended that specific
columns be selected from the administrative views, or
that the result set be described if a SELECT * statement
is used by an application.
DB2 Version 9.7 for Linux, UNIX, and Windows