For Oracle SQL Query Tuning you are welcome to use our free SQL Query Tuning Tool. Rules for SQL query optimization: 1. SQL Performance Tuning team recommends using COUNT(1) instead COUNT(*) for SQL query performance optimization. Example: --Do not use: SELECT COUNT(*) FROM master; --...
Therefore, writing SQL code properly in the first place might help avoid having to use in-depth and overbearing SQL code tuning tools.doi:10.1016/B978-1-55558-345-3.X5000-9Gavin PowellELSEVIERGavin Powell.Oracle Performance Tuning for 10gR2.. 2006...
For example, consider the following PL/SQL block that uses a cursor to retrieve the first 10 hits of a query and uses the FIRST_ROWS(n) hint to optimize the response time:declare cursor c is select /* FIRST_ROWS(10) */ article_id from articles_tab where contains(article, 'Oracle')>...
SQL tuning—This is last step in tuning, and the most time-consuming tuning operation because there can be many thousands of individual SQL statements that access the Oracle database. If you have carefully optimized the workload as a whole from step 2, there you will only need to tu...
Oracle Performance Tuning —— 我的学习理解过程 1. Gathering Database Statistics Using the Automatic Workload Repository Gathering database statistics using the AWR is enabled by default and is controlled by theSTATISTICS_LEVELinitialization parameter. TheSTATISTICS_LEVELparameter should be set toTYPICALor...
Oracle Performance Tuning - Part 1 17 Tips for Avoiding Problematic Queries The source of these 17 tips is fromOracle9i Performance Tuning: Optimizing Database Productivityby Hassan Afyouni (Thompson Course Technology, 2004). These tips provide a solid foundation for two outcomes:making a SQL stateme...
Foglight for Oracle gives you an enterprise view of database health and automates performance analysis to quickly identify and fix problem servers.
Oracle Trace facility Rewrite the SQL statements if necessary. For example, query hints can avoid problems such as unnecessary full-table scans. For more information about these methods, seeOracle Database Performance Tuning Guide. Some PL/SQL features also help improve the performance of SQL statem...
For the query above, the index on NAME should be used if the table contains more distinct names than first names. The SQL statement ANALYZE can be used to automatically estimate the selectivity of the columns in the tables. This command should be run from time to time to improve the ...
Oracle Database Referencefor information about common wait event parameters Load Profiles The Load Profile sectiondescribes the load analyzed in the sampled session activity. Use the information in this section to identify the service, client, or SQL command type that may be the cause of the transi...