About this task
Each entry is an explained statement that is associated
with either:
- A static SQL or XQuery statement in a package
- A dynamic SQL or XQuery statement.
Tasks - Use the Statement menu to view a graphical
representation of an access plan, to dynamically explain a query statement,
to view text for a query statement, or to change or remove a query
statement.
- Use the View menu, or the icons on the
secondary toolbar to sort, filter, or customize the explainable statements.
You can also save the contents of this window using the options in
this menu.
To open
Explained Statements History window,
do one of the following:
- From the Control Center, expand the object tree until you find
the Databases folder, expand the folder until
you find the database you want, and then do one of the following:
- Right-click the database and select Show Explained
Statements History from the pop-up menu, or select .
- Highlight the database and select .
- From the Control Center, expand the object tree until you find
the Packages folder (under the Application
Objects folder). Then:
- click the Packages folder. Any existing
package objects are displayed on the right side of the window.
- Right-click the package that you want, and select Show
Explained Statements History from the pop-up menu; or
highlight the package and select ;
or simply double-click the package.
- From the Explainable Statements window, select .
If a statement is selected in the Explainable
Statements window, the Explained Statements History window
shows all of the explained statements that are related to the selected
SQL statements.
If no statement is selected, the Explained
Statements History window shows all the explained statements
that are related to the package that the explainable statements are
in.
The Explained Statements History window
might or might not contain explained statements, depending on whether
the explain tables exist.
Reading the contents of the Explained
Statements History window
The columns in the window provide
the following information about the query statements that have been
explained:
- Package name
- The name of the package that either:
- Contains the SQL or XQuery statement (in the case of a static
query)
- Issued the SQL or XQuery statement (in the case of a dynamic query).
- Package creator
- The user ID of the user who created the package.
- Package version
- The version number of the package.
- Explain snapshot
- States whether an explain snapshot has been taken for the SQL
or XQuery statement. (If it has not, you cannot view an access plan
graph for the statement.)
- Latest bind
- If the statement is contained in a package, this field indicates
whether or not the statement is associated with the latest bound package.
- Dynamic explain
- States whether the explained query statement was dynamic. (If
it was not, it was a static or SQL or XQuery statement in a package.)
- Explain date
- The date when the statement had an explain operation performed
on it.
- Explain time
- The time when the statement had an explain operation performed
on it.
- Total cost
- The estimated total cost (in timerons) of the statement.
- Statement number
- The line number of the SQL or XQuery statement in the source module
of the application program.
- Section number
- The number of the section within the package that is associated
with the SQL or XQuery statement.
- Query number
- The query number that is associated with the statement.
- Query tag
- The query tag that is associated with the statement.
- Query text
- The first 100 characters of the original SQL or XQuery statement.
(Use the scroll bar at the bottom of the window to scroll through
it.) To view the complete SQL or XQuery statement, select Statement–>Show
Query Text.
- Remarks
- Any remarks associated with the statement. (For example, for a
static query statement, the remark associated with the package containing
the statement.)
DB2 Version 9.7 for Linux, UNIX, and Windows