What Is Pragma Autonomous_transaction?

What is an autonomous transaction?

Autonomous Transactions.

Autonomous transactions allow you to create a new transaction within a transaction that may commit.

or roll back changes, independently of its parent transaction..

What is the Pragma Exception_init used for?

The pragma EXCEPTION_INIT associates an exception name with an Oracle error number. You can intercept any ORA- error and write a specific handler for it instead of using the OTHERS handler.

Is it good to use limit keyword with bulk collect?

LIMIT Clause But this is not advisable when the total record that needs to be loaded is very large, because when PL/SQL tries to load the entire data it consumes more session memory. Hence, it is always good to limit the size of this bulk collect operation.

How do database triggers work?

A database trigger is procedural code that is automatically executed in response to certain events on a particular table or view in a database. The trigger is mostly used for maintaining the integrity of the information on the database.

What is Pragma in SQL?

The PRAGMA statement is an SQL extension specific to SQLite and used to modify the operation of the SQLite library or to query the SQLite library for internal (non-table) data. The pragma command is specific to SQLite and is not compatible with any other SQL database engine. …

How many types of Pragma are there in Oracle?

5 typesThe 5 types of Pragma directives available in Oracle are listed below: PRAGMA AUTONOMOUS_TRANSACTION: This pragma can perform an autonomous transaction within a PL/SQL block between a BEGIN and END statement without affecting the entire transaction.

Can we commit in trigger?

Trigger should not commit and cannot commit. Committing in a trigger usually raises an exception unless it happens into autonomous transaction. When you open connection, Oracle creates session for it.

What is Pragma Serially_reusable and why is it used?

The SERIALLY_REUSABLE pragma indicates that the package state is needed only for the duration of one call to the server (for example, an OCI call to the database or a stored procedure call through a database link). … When the call to the server ends, the memory is returned to the pool.

What is bulk collect in Oracle?

A bulk collect is a method of fetching data where the PL/SQL engine tells the SQL engine to collect many rows at once and place them in a collection. The SQL engine retrieves all the rows and loads them into the collection and switches back to the PL/SQL engine.

What is Pragma Restrict_references in Oracle?

The RESTRICT_REFERENCES pragma asserts that a user-defined subprogram does not read or write database tables or package variables. Note: The RESTRICT_REFERENCES pragma is deprecated. Oracle recommends using DETERMINISTIC and PARALLEL_ENABLE instead of RESTRICT_REFERENCES .

What is mutating table?

A mutating table is a table that is currently being modified by an UPDATE, DELETE, or INSERT statement, or it is a table that might need to be updated by the effects of a declarative DELETE CASCADE referential integrity constraint.

Can use Pragma Autonomous_transaction in packages?

You cannot apply this pragma to an entire package or an entire an object type. Instead, you can apply the pragma to each packaged subprogram or object method. You can code the pragma anywhere in the declarative section.