What is bind and REBIND in DB2?
For static SQL, it’s during the BIND/REBIND process that the DB2 optimizer determines the optimal access path to the data for each SQL statement using various inputs such as the SQL statement text, the schema definition, and the current object statistics from the DB2 catalog. …
When REBIND is required in DB2?
You should use REBIND whenever your situation does not specifically require the use of BIND , as the performance of REBIND is significantly better than that of BIND . When multiple versions of the same package name coexist in the catalog, only one version can be rebound at a time.
What is DB2 bind process?
In the bind process, the SQL statements in the DBRM are put into an operational (“bound”) form, by being translated into the control structures that DB2 uses when it runs SQL statements.
What are the bind parameters in DB2?
Bind Parameters in Db2 12
| Option | Valid values | Plan |
|---|---|---|
| OWNER | Authorization-id | X |
| Determines the authorization ID or the owner of the object (plan or package) | ||
| PACKAGE | Location-name.collection-id. package-id(version-id) | |
| (*) – Rebind Only |
What is cursor in DB2?
Db2 has a mechanism called a cursor . In Db2, an application program uses a cursor to point to one or more rows in a set of rows that are retrieved from a table. You can also use a cursor to retrieve rows from a result set that is returned by a stored procedure.
What is Dbrm plan and package in DB2?
DataBase Request Module, has the SQL statements extracted from the host language program by the SQL precompile. The Db2 system uses the DBRM to optimize application program interaction. PACKAGE: A package contains control structures that DB2 uses when it runs SQL statements.
What does a DB2 rebind do?
The REBIND command allows the user to re-create a package stored in the database without the need for a bind file.
Why is bind used in Db2?
The BIND command invokes the bind utility, which prepares SQL statements stored in the bind file generated by the precompiler, and creates a package that is stored in the database.
What is the purpose of bind in Db2?
The Bind Utility generates a static package in DB2 from the contents of a local database request module (DBRM). A package is a single, bound DBRM containing optimized access paths to data. A DBRM contains all the information needed to create a package in a remote database.
What is the purpose of bind in DB2?
What happens in BIND step in a DB2 program?
The Process – Validates the object (tables, views, and column names) references in the SQL statements of the application program against the DB2 catalog. Verifies the authorization of the program owner and authorization level to access the data that was requested by the SQL statements in the application program.