oracle performance tuning guide

. 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

There are many Oracle Performance Tools. I accidentally saw Metalink Note (438452.1): Performance Tools Quick Reference Guide mentioned in Tanel Poder on a website. This document is indeed quite new, and there are several tools worth noting. LTOM：TheLiteOnboardMonitor Java program, positioned as "real-time Dia

identifies the session process ID of all users with the name starting with a: 1.select S.username, p.spid from V$session S, v$process P 2. 3.where s.paddr = p.addr and s.username like ' a% '; 4. 6) to sysdba into Sqlplus execution 1.alter session Set Timed_statistics=true; 2. 3.alter session Set max_dump_file_size=unlimited; 4. 5.oradebug Setospid 6. 7.oradebug Unlimit 8. 9.oradebug event 10046 Trace name forever, Level X/* Where x = (1,4,8,12) * * 10. 7 Track a session applicat

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

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

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

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

With the SPA, you can play specific types of changes depending on the type of change (such as initialization of change, optimizer statistics refresh, and database upgrade)SQL or the entire SQL payload, and then generate a comparison report that helps you evaluate their impact.In the version number prior to Oracle Database 11g, I had to capture all the SQL statements and execute them by tracing,Then get the run plan-this is a very time-consuming and er

With SPA, you can play a specific stream based on various types of changes (such as initialization parameter changes, optimizer statistics refresh, and database upgrades)SQL or the entire SQL load, and then generate a comparison report to help you evaluate their impact. In versions earlier than Oracle Database 11g, I must capture all SQL statements and trace and run these statements,Then get the execution plan-this is an extremely time-consuming and e

Virtual indexes for Oracle Performance Optimization A virtual index is a pseudo index defined in the data dictionary, but there is no relevant index segment. The purpose of a virtual index is to simulate the storage of indexes, instead of creating a complete index. This allows developers to create virtual indexes to view the corresponding execution plan, without having to wait until the actual index is crea

Oracle| Notes | performance Oracle Performance Diagnostics-Learn Statspack notes (i) Author: Liu Yingbo Time: 2004-3-2 Mail:liuyingbo@126.com, please correct me. Reprint please indicate the source and the author Description: oracle8.1.6 began to introduce Statspack,statspack is a powerful tool for diagnosing