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Overriding Default Locking
By default, the Oracle locks the data structures for you automatically. Though, you can request exact data locks on rows or tables when it is to your benefits to override the default locking. The Explicit locking share or deny access to the table for the period of a transaction.
With the LOCK TABLE statement, you can explicitly lock the whole table. With the SELECT FOR UPDATE statement, you can explicitly lock the specific rows of a table to make sure that they do not change before an update or delete is executed. Though, the Oracle automatically obtains the row-level locks at update or deletes time. Therefore, use the FOR UPDATE clause only if you want to lock the rows before the update or delete.
Cursor Variables: To execute the multi-row query, the Oracle opens an unnamed work region that stores the processing information. You can use an explicit cursor that names
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Understanding Varrays The Items of type VARRAY are termed as the varrays. They permit you to relate a single identifier with the whole collection. This relationship lets you man
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THEO R Y OF PANSPERMIA - Arrhenius (1908) postulated the cosmic panspermia theory that claims that organisms existed throughout the universe, and their spores, etc., could
Name Resolution During the compilation, the PL/SQL compiler relates identifiers like the name of a variable with an address or memory location, actual value, or datatype. Th
At times, customers make mistakes in submitting their orders and call to cancel the order. Brewbean’s wants to create a trigger that automatically updates the stock level of all pr
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