automatically every night as an automatic SQL optimization task. Sometimes, you may need to have aSQL statements are immediately optimized. You can use SQL optimization to guide Analysis of SQL statements at any time and gain performancerecommendations. Typically, running this guidance is similar to using ADDM to find performance problems. In addition, you can r
Oracle
Objective
Over the past decade, Oracle has become one of the most professional databases in the world. For IT professionals, it is important to ensure that Oracle's powerful features are used to improve the productivity of their companies. One of the most effective ways to do this is through Oracle tuning. It h
Oracle
Oracle Expert Tuning Secrets
Objective
Over the past decade, Oracle has become one of the most professional databases in the world. For IT professionals, it is important to ensure that Oracle's powerful features are used to improve the productivity of their companies. One of the most effective ways to d
planning
Instance Tuning
Instance optimization
SQL Tuning
SQL optimization
1.1.1 Performance PlanningBefore starting on the instance or SQL tuningsections of this guide, make sure you have read part II, "Performance plannin G ". Before you learn the exa
read the output results to get all the information. Even the first page is enough to tell you where the remaining 10% of the Report is worth your attention. The statistical package of Oracle 9.2 contains the CPU and consumption time columns. Previously, in order to sort long-running SQL statements to the top, we had to enable "tracing", connect tracing files, and deliver them to the tkprof program for proc
in SSMS
T-SQL Tools
SQL Profiler
Query Analyzer
Database Engine Tuning Advisor
Windows Event Viewer, primarily to view the following event logs
Windows Application Log
Windows system logs
Windows security Log
Windows System Monitor is able to track:
Objective
Over the past decade, Oracle has become one of the most professional databases in the world. For IT professionals, it is important to ensure that Oracle's powerful features are used to improve the productivity of their companies. One of the most effective ways to do this is through Oracle tuning. It has a large number of
Chapter 2 procedural performance tuning of PL/SQL applications
I. Reasons for PL/SQL Performance problems
When the execution efficiency of PL/SQL-based applications is low, it is usually caused by poor SQL statements and programming methods, poor understanding of PL/
SQL Optimization
Oracle SQL optimization is a complex topic, and even requires the entire book to introduce the nuances of Oracle SQL optimization. However, there are some basic rules that every Oracle DBA must follow. These rules
performance, and to control their sum within the value specified by the Sga_target. Once you assign a value to Sga_target (the default is 0, that is, ASMM is not started), the ASMM feature is started automatically.iii. Oracle Memory tuning approachWhen a performance problem arises in the production environment of a project, how do we determine which parameters need to be adjusted? 3.1 Check the library cac
actually specified as the sqlid of the statement) --Generates an AWR report of an SQL statement, runs the script Awrsqrpt.sql
Awrsqrpi.sql: Generates a statistical report of the specified SQL statement for the specified DB instance, specifying the snapshot interval;
Awrddrpt.sql: Specify two different time periods, generate a statistical comparison report of the two periods;
Awrddrpi.sql: Speci
Read Catalogue
(1) Select the most efficient table name order (valid only in the rule-based optimizer)
(2) connection order in the WHERE clause
(3) Avoid using ' * ' in the SELECT clause
(4) Reduce the number of accesses to the database
(5) Reset the ArraySize parameter in Sql*plus, sql*forms and pro*c to increase the amount of data retrieved per database access, with a recommended value of 200
Label: Read Catalogue
(1) Select the most efficient table name order (valid only in the rule-based optimizer)
(2) connection order in the WHERE clause
(3) Avoid using ' * ' in the SELECT clause
(4) Reduce the number of accesses to the database
(5) Reset the ArraySize parameter in Sql*plus, sql*forms and pro*c to increase the amount of data retrieved per database access, with a recommended
statement, which, through the Awrsqrpt.sql script, can generate information such as the execution plan of the specified SQL (once executed SQL), the resources consumed, and so on, to help DBAs with SQL tuning. Here's how to do this first, or execute the build script: sql> @
optimization phase. If the difference between the two is very large, the actual performance statistics are stored as statistical information feedback, and the statement is also marked as re-optimized. When the statement is executed the next time, statistical feedback is used to select a more appropriate degree of parallelism (DOP).--Note:1) from the Oracle 11GR2 backwards, the parallel hint in the statement will cause the system to automatically sele
at the statement level, the hint syntax is:/*+ bind_aware*/;Ø about outlines: In the scene of outlines existence, the ACS will fail whether the system level is enabled or the statement level is enabled through hint;6. Conclusion:New features of Oracle Database 11g The ACS feature provides an easy way to efficiently share SQL statement execution plans with bound variables. Because ACS produces a new executi
Preface
In the past decade, Oracle has become one of the world's most professional databases. For IT experts, it is to ensure that their company's productivity is improved by leveraging the powerful features of oracle. One of the most effective methods is to use ORACLE optimization. It has a lot of parameters and technologies to improve the performance of your
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