sql tuning in oracle 11g step by step

Click the execute icon on the first step to create the SQL Performance Analyzer task. If you want SQL to accomplish different things, then write various statements, rather than writing one statement to do different things depending on the parameters you give it. By default, AWR retains data for the last eight days. The following tools can identify high-load SQL statements: The first step in identifying resource-intensive SQL is to categorize the problem you are attempting to fix: Is the problem specific to a single program (or small number of programs)? Starting with the 11g Release 1 (11.1), Oracle database contains the SQL Test Case Builder, which automates the somewhat difficult and time-consuming process of gathering and reproducing as much information as possible about a problem and the environment in which it occurred. It is both time and resource intensive to invoke Automatic Tuning Optimizer every time a query must be hard-parsed. SQL profiles provide the following benefits: Unlike hints and stored outlines, profiles do not tie the optimizer to a specific plan or subplan.

This hash function changes the SQL statement to upper case and removes all extra whites spaces before generating the signature. In each case, Automatic Tuning Optimizer makes relevant suggestions to restructure the statements. In addition, you can rank statements based on any combination of execution statistics. In the following example, the SQL statements in the STS are displayed for statements with a disk-reads to buffer-gets ratio greater than or equal to 75%. Click on the "SQL Tuning Sets" link towards the bottom of the "Performance" tab. You can use an STS as input to SQL Tuning Advisor, which performs automatic tuning of the SQL statements based on other user-specified input parameters. A strategic plan for Oracle SQL tuning Many people ask where they should start when tuning Oracle SQL. ... the SQL tuning process has been automated by the automatic SQL tuning features of Oracle Database. For each proposed recommendation, the rationale and benefit is provided along with the SQL statements needed to implement the recommendation. SQL Tuning Advisor takes one or more SQL statements as an input and invokes the Automatic Tuning Optimizer to perform SQL tuning on the statements. This can be done with three separate queries: However, it is more efficient to run the entire query in a single statement. The following example shows how to tune join order effectively: Choose the driving table and the driving index (if any). You can create a SQL tuning task for a single SQL statement. The automatic SQL tuning feature also automatically identifies problematic SQL statements and implements tuning recommendations during system maintenance windows as an automated maintenance task. For example, run the following query: You can check the execution progress of SQL Tuning Advisor in the V$ADVISOR_PROGRESS view. Choose the best join order, driving to the best unused filters earliest. Often, rewriting an inefficient SQL statement is easier than modifying it. The total number of buffer gets in the system is available in the V$SYSSTAT table, for the statistic session logical reads. Generates a SQL test case corresponding to the SQL text passed as an argument. It is possible to change the execution plan of the statement without altering the functionality to reduce the resource consumption. Step 1: Identify high-impact SQL Consider reordering columns in existing concatenated indexes.

The recommendation is to run DBMS_SQLTUNE.ACCEPT_SQL_PROFILE to accept the profile, which should enable the statement to run 98.53% faster.

For example, the database does not implement a profile when the objects referenced in the statement have stale optimizer statistics. The UPDATE_SQLSET procedure updates the attributes of SQL statements (such as PRIORITY or OTHER) in an existing STS identified by STS name and SQL ID. 13c | A SQL profile is a set of auxiliary information specific to a SQL statement. It just plugs through each statement gathering performance statistics.

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