Why cursors are used in oracle

The top queries that are opening maximum cursors and are not closing subsequent cursors gracefully are displayed. If some code is running above SQL queries, then check that Java Statement, Resultset, or connection are closing properly or not if they have access to the code. If the code is not closing the connections, then close all the open connections properly so that you can save memory leaks in the code and save database memory.

Report a Bug. Previous Prev. Next Continue. Home Testing Expand child menu Expand. SAP Expand child menu Expand. Web Expand child menu Expand. Must Learn Expand child menu Expand. Big Data Expand child menu Expand. Live Project Expand child menu Expand. AI Expand child menu Expand. Toggle Menu Close. Search for: Search. A query that returns a result set of rows. If the cursor declaration declares parameters, each parameter must be used in the query.

You must declare a variable before referencing it in a cursor declaration. You cannot assign values to a cursor name or use it in an expression. However, cursors and variables follow the same scoping rules. You retrieve data from a cursor by opening it, then fetching from it. The scope of cursor parameters is local to the cursor, meaning that they can be referenced only within the query used in the cursor declaration. The values of cursor parameters are used by the associated query when the cursor is opened.

The datatype of a cursor parameter must be specified without constraints, that is, without precision and scale for numbers, and without length for strings.