Question: Can We Use Bulk Collect In Cursor?

Which cursor is faster in Oracle?

The output from the procedure clearly demonstrates that implicit cursors are faster than explicit cursors.

The interesting thing is that the implicit cursor is not only faster, but it is actually doing more work, since it includes a NO_DATA_FOUND and a TOO_MANY_ROWS exception check..

How do I use bulk collect?

Syntax: SELECT BULK COLLECT INTO bulk_varaible FROM

; FETCH BULK COLLECT INTO ; In the above syntax, BULK COLLECT is used in collect the data from ‘SELECT’ and ‘FETCH’ statement.

What is bulk exception?

Description Add the SAVE EXCEPTIONS clause to your FORALL statement when you want the PL/SQL runtime engine to execute all DML statements generated by the FORALL, even if one or more than fail with an error. If you use INDICES OF, you will need to take some care to find your way back to the offending statement.

Can we use 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.

Can we write commit in function or trigger or procedure?

Can we have COMMIT inside Trigger? Yes, you can commit inside the trigger. But for this you have to make this trigger transaction to be an Independent transaction from its parent transaction, you can do this by using Pragma.

Is it good to use limit keyword with bulk collect?

As the number of rows in the table grows, more memory will be consumed. So the general recommendation for production code, working with tables that may grow greatly in size, is to avoid SELECT BULK COLLECT INTO (an implicit query) and instead use the FETCH BULK COLLECT with a LIMIT clause.

How do you debug in PL SQL?

Right-click the PL/SQL object that you want to debug and select Database Tools | Recompile. In the Recompile dialog, select With “debug” option. Click OK.

What is the use of limit clause in bulk collect in Oracle?

As LIMIT works as an attribute of the FETCH-INTO statement thus to use it you can add keyword LIMIT followed by a specific numerical digit which will specify the number of rows that the bulk-collect clause will retrieve in one go at the end of FETCH-INTO statement.

When should I use bulk collect?

When you are certain that the returning result of your SELECT statement is small then you should use Bulk Collect clause with Select-Into statement. Otherwise your bulk collect clause will make your Select-Into statement a memory hogging monster. Consequently it will slowdown the performance of your database.

What are the advantages of bulk binding?

Bulk binds can improve the performance when loading collections from a queries. The BULK COLLECT INTO construct binds the output of the query to the collection.

What is bulk load in Oracle?

14.3 Loading Data Into the Schema by Using bulkload. The bulk loader, bulkload , is a bulk management tool. It takes input data in LDIF or SQL*Loader format and loads the data directly into Oracle Internet Directory’s schema in the metadata repository.

What is the difference between bulk collect and forall?

Bulk collect: is a CLAUSE. is used to fetch the records from the cursor. Forall: is a STATEMENT. is used to do dml operation of fetched records. The body of the FORALL statement is a single DML statement — an INSERT, UPDATE, or DELETE.

What is the use of bulk collect in PL SQL?

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 bulk insert in Oracle?

Rather, the bulk insert is done when you have a scientific problem to solve where you read your data into PL/SQL arrays and then twiddle the data in RAM. Upon completion of the calculations, the bulk insert will write the data from the PL/SQL array into a table far faster than a traditional cursor for loop.

What is Pragma Autonomous_transaction?

The AUTONOMOUS_TRANSACTION pragma changes the way a subprogram works within a transaction. A subprogram marked with this pragma can do SQL operations and commit or roll back those operations, without committing or rolling back the data in the main transaction. … They pass information to the compiler.

What is ref cursor in Oracle?

Introduction to REF CURSORs Using REF CURSOR s is one of the most powerful, flexible, and scalable ways to return query results from an Oracle Database to a client application. A REF CURSOR is a PL/SQL data type whose value is the memory address of a query work area on the database.

What is PL SQL collection?

A collection is an ordered group of elements having the same data type. Each element is identified by a unique subscript that represents its position in the collection. PL/SQL provides three collection types − Index-by tables or Associative array.

How do you handle exceptions in bulk collect?

Key components of bulk DML with exception handling:A collection variable to hold the data.The FORALL construct which iterates through values in the collection variable.The SAVE EXCEPTIONS clause which tracks the exceptions being raised during bulk DML.More items…•