Are Oracle cursors bad?

Are Oracle cursors bad?

6 Answers. What’s wrong with cursors is that they are often abused, both in Oracle and in MS SQL . Cursor are for keeping a stable resultset which you can retrieve row-by-row. They are implicitly created when your query is run, and closed when it’s finished.

What are the types of cursors in Oracle?

PL/SQL has two types of cursors: implicit cursors and explicit cursors.

Which cursor is faster in Oracle?

implicit cursors
The short answer is that implicit cursors are faster and result in much neater code so there are very few cases where you need to resort to explicit cursors.

Why cursor should not be used?

Cursors are used to fetch single rows from the result set returned by a query and allow the row-by-row iteration through the result set, whereas set based processing can be much faster. Cursors can also cause transactional problems because of the run time.

Can cursor be part of a trigger body?

SQL Statements Allowed in Trigger Bodies statements or the SELECT statement in the definition of a cursor. DDL statements are not allowed in the body of a trigger. Also, no transaction control statements are allowed in a trigger.

Why do we use cursors?

Cursors are used by database programmers to process individual rows returned by database system queries. Cursors enable manipulation of whole result sets at once. In this scenario, a cursor enables the sequential processing of rows in a result set.

What are cursors in Oracle SQL?

A cursor holds the rows (one or more) returned by a SQL statement. The set of rows the cursor holds is referred to as the active set. You can name a cursor so that it could be referred to in a program to fetch and process the rows returned by the SQL statement, one at a time.

What is the difference between implicit cursor and explicit?

Implicit cursors are automatically created when select statements are executed. Explicit cursors needs to be defined explicitly by the user by providing a name. They are capable of fetching a single row at a time. Explicit cursors can fetch multiple rows.

What are the drawbacks of implicit cursors?

The implicit cursor has the following drawbacks:

• It is less efficient than an explicit cursor (in PL/SQL Release 2.2 and earlier)
• It is more vulnerable to data errors.
• It gives you less programmatic control.