How to enable result Cache in Oracle 11g?

How to enable result Cache in Oracle 11g?

You can enable Query Result Cache at the database level using the RESULT_CACHE_MODE initialization parameter in the database initialization parameter file. The same parameter can also be used at the session level using the ALTER SESSION command.

What is result Cache in Oracle 11g?

Result Cache is a new feature in Oracle 11g and it does exactly what its name implies, it caches the results of queries and puts it into a slice of the shared pool. If you have a query that is executed often and reads data that rarely changes, this feature can increase performance significantly.

How to use result Cache in Oracle?

1. Setup. Set up the following schema objects to see how the SQL query cache works.
2. Test It. Query the test table using the slow function and check out the elapsed time.
3. RESULT_CACHE_MODE. The default action of the result cache is controlled by the RESULT_CACHE_MODE parameter.
4. Scalar Subquery Caching.

What are bulk exceptions in Oracle?

Thursday May 14th 2015 by David Fitzjarrell. When using BULK COLLECT it’s possible to see all of the exceptions thrown for the bulk collection by coding the exception handler properly. Read on to see how to implement such an exception handler.

How do you handle exceptions in collections?

Key components of bulk DML with exception handling:

1. A collection variable to hold the data.
2. The FORALL construct which iterates through values in the collection variable.
3. The SAVE EXCEPTIONS clause which tracks the exceptions being raised during bulk DML.

Why bulk collect is faster in Oracle?

The larger the number of rows processed, the more performance is gained by using a bulk collect. In the Oracle database, the PL/SQL engine may perform a bulk collect for you. Here instead of fetching one row, we bulk collect all the rows at once.

Is there a result cache in Oracle 11g?

For example, Oracle Database’s Result Cache feature, which was introduced with Oracle Database 11 g Release 1, has received a lot of attention for its ability to cache SQL query and PL/SQL function results in memory.

How long does it take to cache a query in Oracle?

If the information is not present, it will cache the results of the query provided there is enough room in the result cache. Since we have no cached results, we would expect the first run to take approximately five seconds, but subsequent runs to be much quicker.

What does it mean to have a result cache?

In simple terms, the Result Cache could be called a cache area within a cache, in this case, the shared pool. So, the Result Cache is an area in the shared pool and contains the end results of a query execution. What does this mean? Let’s examine this through an example; the following query is executed in an Oracle Database 11 g Release 2 database:

How is the default action of the result cache controlled?

The default action of the result cache is controlled by the RESULT_CACHE_MODE parameter. When it is set to MANUAL, the RESULT_CACHE hint must be used for a query to access the result cache. If we set the RESULT_CACHE_MODE parameter to FORCE, the result cache is used by default, but we can bypass it using the NO_RESULT_CACHE hint.