oracle performance tuning tutorial

. You can use this sql_id's ASH report to supplement the information given here。 The related object sql_id is a CAFV93454T4JV SQL statement. INSERT into t values (' M ', +, ' young ', ' TTT ') principle SQL spends only 0% of its database time on CPU, I/O, and cluster waits. Therefore, SQL tuning guidance does not apply to this scenario. Review your SQL performance data to find possible improvement

is around 95%. This ratio is relatively optimized. Install statspack SQL>connect/assysdbaSQL>@?/rdbms/admin/spcreate Uninstall SQL>connect/assysdbaSQL>@?/rdbms/admin/spdrop/*Timed_statistics = true before collecting information;Altersystemsettimed_statistics = true;*/ Collect information SQL>connectperfstat/perfstatSQL>executestatspack.snap; Automatic Collection SQL>connectperfstat/perfstatSQL>@?/rdbms/admin/spauto Delete automa

The ORACLE tutorial is: Oracle SQL Performance Optimization Series 2. 4. Select the most efficient table name sequence (only valid in the rule-based Optimizer) The ORACLE parser processes the table names in the FROM clause in the order FROM right to left. Therefore, the tab

Some time ago, in Ali mother new room pressure test process used in the LR test Oracle, with the DBA (landlords) in Hangzhou netcom New computer room for 1000 users of the pressure simulation test. The entire stress test takes two days. The following are some of the experiences: 1 The stress test process found that some of the SQL scripts performed very slowly and were optimized. 2 The best concurrent testing, otherwise the service is basically no p

The Oracle tutorial you are looking at is: Oracle SQL Performance Tuning Series learning three. 8. Use the Decode function to reduce processing time Use the Decode function to avoid repeatedly scanning the same record or repeating the same table. For example: SELECT COUNT

The ORACLE tutorial is: Oracle SQL Performance Optimization Series 2.4. Select the most efficient table name sequence (only valid in the rule-based Optimizer)The ORACLE parser processes the table names in the FROM clause in the order FROM right to left. Therefore, the table

. In win32, only PHP3 can connect to the oracle Database. Therefore, only the performance of connecting oracle with PHP3 is tested. I believe that after the official version of PHP4 is released, the speed of connecting oracle with PHP4 should be improved. In LINUX, I only tested the

manufacturer, Oracle database at home and abroad to obtain a lot of successful applications, according to statistics, the global 93% of the listing. COM companies, 65 "Fortune Global 100" Enterprises invariably use Oracle database to carry out e-commerce. Many enterprises, government units and E-commerce websites in China have also adopted Oracle as the database

Oracle-based high-performance dynamic SQL Program Development Oracle-based high-performance dynamic SQL Program Development The ORACLE tutorial is: Oracle-based high-

introduced in Oracle7.0.1.2, with roughly 100 waiting events. This number is increased to approximately 150 in Oracle 8.0, with approximately 200 events in oracle8i and approximately 360 waiting events in oracle9i. There are two main categories of wait events, idle (idle) Wait events and non-idle (non-idle) wait events.Information about idle events and non-idle events is now available through Google and can be found in much more detail, whileThere is

Preface In a single application environment or system with relatively simple business, the bottleneck of system performance problems is often self-evident. The premise for solving the problem is that locating the problem is easier to solve, however, in a complex application environment, various application systems tend to share and compete with system resources, and application systems may also have symbiotic or restrictive relationships, the balance

The Oracle tutorial you are looking at is the development of high-performance, dynamic SQL programs based on Oracle. Absrtact: The development of dynamic SQL program is summarized, and some development techniques are given according to the author's actual development experience.Key words: Dynamic Sql,pl/sql, high perfo

The Oracle tutorial is: Oracle-based high-performance dynamic SQL Program Development. Abstract: This article summarizes the development of dynamic SQL programs and provides several development skills based on the actual development experience of the author. Keywords: dynamic SQL, PL/SQL, high

, analysis, and system tuning. Pylot generates concurrent loads (HTTP requests), verifies server responses, and produces reports with metrics. Execute and monitor test suites via GUI or shell/console.Web Capacity Analysis tool (WCAT) – A lightweight load generation utility that reproduces script HTTP requests to a WEB server (or load-balanced farm) and collects performance statistics for future analyses. WC

The ORACLE tutorial is: Oracle acquires TimesTen to improve database software performance. Oracle announced in June 9 that it had agreed to acquire TimesTen, a private software company whose products can improve the performance of

database performance bottleneck, then the solution is as follows:A.1 increase the write process while adjusting the db_block_lru_latches parameters.Example: Modify or add the following two parametersDb_writer_processes=4Db_block_lru_latches=8A, 2 asynchronous IO,IBM This is much simpler, and HP is a bit more troublesome to contact HP engineers.b, DB file sequential read, refers to the sequential read, that is, the full table scan, which is the part w

The Oracle tutorial you are looking at is: Oracle performance optimization. Linux Journal published an article that optimizes the Oracle database and feels very useful. Briefly introduce its summary and everyone to share Linux in enterprise database applications.Currently, H

Oracle Performance Optimization The ORACLE tutorial is: Excellent Oracle performance. Increasing the SGA buffer seems to have not significantly improved the performance, and the loading

Performance Analysis of Oracle primary keys and composite primary keys. Primary keys and composite primary keys have the same query performance (the same index height and the appropriate use of indexes ). Primary Key and composite primary key, (update, in Performance Analysis of Or