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SET CATALOG
Example
Syntax
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The default behavior is for the transaction to wait until it obtains the required lock or until
it times out waiting for the lock.
The following example demonstrates the WITH clause in the SELECT statement:
FOR UPDATE clause
Specifies update intention on the rows selected by the SELECT statement.
OF [ table.]column_name , ...
NOWAIT
Specifies the table’s column name to be updated.
Causes the SELECT statement to return immediately with an error if a lock cannot be
acquired on a row in the selection set because of the lock held by some other transaction.
The default behavior is for the transaction to wait until it obtains the required lock or until
it times out waiting for the lock.
Note If you specify FOR UPDATE, the database acquires exclusive locks on all the rows satisfying the
SELECT statement. The database does not acquire row level locks if there is an exclusive lock on
the table. See the LOCK TABLE statement for information on table locking.
SET CATALOG
Syntax
SELECT * FROM Customer WHERE “CustNum” < 100 ORDER BY “CustNum” FOR
UPDATE
WITH (READPAST WAIT 1);
FOR UPDATE [ OF [ table.]column_name , ... ] [ NOWAIT ]
Changes the default catalog name to be used for schema, table, and column references. The
default catalog name is initially the name of the primary database.
SET CATALOG catalog_name;
catalog_name
Catalog name to be used as an alias for the database in schema, table and column
references. This must be in the form of an SQL identifier of up to 32 bytes in length.
Example In this example, the auxiliary database connection identified by the catalog named mydb1 is
specified as the default catalog:
SET CATALOG mydb1;