When you are optimizing a complicated SQL statement, Quest SQL Optimizer is capable of generating hundred to even thousands of SQL alternatives. While theoretical this may be nice, it is not practical...
Oracle provides optimization hint that can be added to the syntax of a SQL statements to attempt to influence the execution plan that the database optimizer will use to execute the SQL statement. Ques...
This tip sheds some insight on why the SQL optimization process can take hours to run and what you can do to shorten the process. SQL Statement with Views When the SQL statement is using Views inst...
This tip covers the expectation that Quest SQL Optimizer will always be able to improve the performance of your SQL statements. Occasionally, even when you have increased the intelligence level up to...
This tip explains how the Oracle optimization hints are applied to the SQL statements to generate more execution plans in Quest SQL Optimizer for Oracle. One technique that you can use to improve the...
This tip covers why the run time of a SQL statement may vary from one execution to the next. When you execute a SQL statement several times in Quest SQL Optimizer, you may notice that the run time wi...
When writing a SQL statement, it is easy to be satisfied when you have figured out how to get the correct results. This is especially true when you are writing a complicated SQL statement. But in orde...
This tip covers executing SQL statements that require you to enter a parameter before the SQL statements are executed. A SQL statement with a variable which is provided at run time poses an extra chal...
This tip covers testing the SQL alternatives in a development environment when it is not possible to do extensive testing in the production environment. When optimizing a SQL statement, you need to t...
This tip covers how to specify the table join syntax which is used when SQL alternatives are generated. When the syntax for SQL statements was originally developed, the conditions of joining tables w...
This tip covers the importance of finding the best “driving path” for retrieving rows from the database. We’ll use a simple illustration of a Nested Loop operation that retrieves data accessing 2 tab...
This tip covers using the batch optimization process when your database is set to run with the rule based optimizer. In the Batch Optimizer in Quest SQL Optimizer for Oracle you may notice that the o...
