How to update records without invalidating cursor oracle
It also enables you to achieve a significant reduction of network overhead in client/server applications. The declarative part declares PL/SQL variables, exceptions, and cursors.
This function is invoked in the following anonymous block by assigning the function’s return value to a cursor variable declared in the anonymous block’s declaration section.
You can directly enter SQL data manipulation language (DML) statements inside PL/SQL blocks, and you can use procedures supplied by Oracle to perform data definition language (DDL) statements.
PL/SQL code runs on the server, so using PL/SQL lets you centralize significant parts of your database applications for increased maintainability and security.
Hence, we have practically verifiedthat a SQL statement which has not been previously executed in an instance, when repeatedly executed in a session, gets cached at the end of the third execution. When the same SQL statement is issued in another session, it gets cached in that session’s cursor cache after the very first execution.
Hence, after the cursor of a SQL in library cache is invalidated, the SQL statement needs to be executed at least three more times to get it cached in the session cursor cache. When the cursor of a SQL is flushed out of the library cache, the SQL statement needs to be executed three more times to get it cached in the session cursor cache Hence, after the cursor of a SQL is flushed / aged out of the library cache, the SQL statement needs to be executed three more times in a session to get it cached in the session cursor cache. Caching of the cursor in PL/SQL Block As I mentioned earlier, SESSION_CACHED_CURSORS also constrains the size of the PL/SQL cursor cache used by PL/SQL to avoid parsing the statements re-submittted by a user.