- When should I use bulk collect?
- What are the advantages of bulk binding?
- What is Oracle collection?
- What is cursor variable in Oracle PL SQL?
- What is bulk exception?
- Which cursor is faster in Oracle?
- What are ref cursors in Oracle?
- How do you debug in PL SQL?
- Does bulk collect overwrite?
- What is bulk collect in Oracle with example?
- How do you handle exceptions in bulk insert?
- What is the use of limit clause in bulk collect in Oracle?
- What is Pragma Exception_init?
- What is PL SQL collection?
- Does limit work in Oracle?
- What is bulk binding in Oracle?
- What is difference between bulk collect and bulk bind in Oracle?
- How do I choose my bulk collect limit?
- What is mutating triggers in Oracle?
- What is bulk update?
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 Oracle collection?
A Collection is an ordered group of elements of particular data types. … Collections are most useful things when a large data of the same type need to be processed or manipulated. Collections can be populated and manipulated as whole using ‘BULK’ option in Oracle.
What is cursor variable in Oracle PL SQL?
Introduction to PL/SQL cursor variables A cursor variable is a variable that references to a cursor. Different from implicit and explicit cursors, a cursor variable is not tied to any specific query. Meaning that a cursor variable can be opened for any query.
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.
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.
What are ref cursors in Oracle?
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. … A REF CURSOR refers to a memory address on the database.
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.
Does bulk collect overwrite?
Is there any way that after the second bulk collect, data does not get override of the first bulk collect.
What is bulk collect in Oracle with example?
What is BULK COLLECT? BULK COLLECT reduces context switches between SQL and PL/SQL engine and allows SQL engine to fetch the records at once. Oracle PL/SQL provides the functionality of fetching the records in bulk rather than fetching one-by-one.
How do you handle exceptions in bulk insert?
In order to bulk collect exceptions, we have to use FORALL clause with SAVE EXCEPTIONS keyword. Connect to SQL*Plus with proper credentials and run following query to create the table and populate it with some data. Run following PL/SQL block to populate the table and later on update it to see the exception behaviour.
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.
What is Pragma Exception_init?
PRAGMA EXCEPTION_INIT associates a user-defined error code with an exception. A PRAGMA EXCEPTION_INIT declaration may be included in any block, sub-block or package. You can only assign an error code to an exception (using PRAGMA EXCEPTION_INIT) after declaring the exception.
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.
Does limit work in Oracle?
Starting from Oracle 12c R1 (12.1), there is a row limiting clause. It does not use familiar LIMIT syntax, but it can do the job better with more options.
What is bulk binding in Oracle?
Bulk Binds are a PL/SQL technique where, instead of multiple individual SELECT, INSERT, UPDATE or DELETE statements are executed to retrieve from, or store data in, at table, all of the operations are carried out at once, in bulk.
What is difference between bulk collect and bulk bind in Oracle?
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.
How do I choose my bulk collect limit?
How to Pick the Limit for BULK COLLECTStart with 100. … Test to see if that’s fast enough (likely will be for many cases).If not, try higher values until you reach the performance level you need – and you are not consuming too much PGA memory.Don’t hard-code the limit value: make it a parameter to your subprogram or a constant in a package specification.More items…•
What is mutating triggers in Oracle?
A mutating table error (ORA-04091) occurs when a row-level trigger tries to examine or change a table that is already undergoing change (via an INSERT, UPDATE, or DELETE statement). … Then I demonstrate how to use the compound trigger, added in Oracle Database 11g Release1, to solve the problem much more simply.
What is bulk update?
Updating data in Vector tables can be done as either a batch or bulk operation. Batch operations go to the PDTs (memory) by default. Bulk operations are written to the table files on disk by default. … UPDATE is a batch operation that quickly modifies a small number of records.