Discover oracle performance tuning pdf, include the articles, news, trends, analysis and practical advice about oracle performance tuning pdf on alibabacloud.com
The Oracle tutorial being looked at is: Oracle SQL Performance Tuning series learning one. 1. Choose the appropriate Oracle OptimizerThere are 3 Oracle optimizer types:A. Rule (rule-based) b. Cost (based on costs) c. CHOOSE (optio
------------------------------------------------------------------------------------------Idx_ historyalarm$02historyalarm20140731unusableidx_historyalarm$02historyalarm20140801usableidx_historyalarm$ 02historyalarm20140802usableidx_historyalarm$02historyalarm20140803usableidx_historyalarm$ 02historyalarm20140804usableidx_historyalarm$02historyalarm20140805usable ...You can see that the index of the partition HISTORYALARM20140731 is already labeled unusable.When indexes are marked as unavailable
Tags: style blog http color using OS IO strongOne, automatic workload library (Automatic Workload Repository,awr)The Automated Workload library (Automatic Workload repository,awr) is a tool provided by Oracle Corporation. AWR can automatically collect, process, and save performance statistics, which are stored in memory and then saved in a database that can be displayed in a report or queried through a view
For some current releases, three dynamic performance views are available for DBAs (Database Administrator, Database Administrator) and developers, namely V $ SQL, V $ SQLAREA, and V $ SQLTEXT.These views can be used to collect statistics about SQL command execution. In Oracle 10g and Release 2, the fourth dynamic performance view, V $ SQLSTATS, is added to facili
information on the use and performance of the main hardware components of the system, as well as the performance of the operating system itself. This information is critical for detecting potential resource consumption, such as CPU cycles and physical memory, as well as detecting poor performance of peripherals such as disk drives. Operating system statistics ar
details of the table, according to the name of the detail table can generally understand its content, and feel that there is no need to thoroughly understand the details of the structure of the table. and different versions of Oracle have a corresponding change to the structure of these tables. All, here the structure of the table and the corresponding contents are omitted ... For example: You see Stats$sql_summary, you can certainly think of a SQ
of total CPU time. Us:user time Sy:system time Id:idle time NOTES Vmstat does not require special permissions. These reports are intended to help identify system bottlenecks. Linux Vmstat does not count itself as a run- Ning process. All Linux blocks are currently 1k, except for CD-ROM blocks which are 2k. FILES /proc/meminfo /proc/stat /proc/*/stat ALSO PS (1), Top (1), free (1) BUGS Does not tabulate the "block IO" Per Device or count the number of system calls.
Tags: list img Direct processing manager requires POS manual sed Take the training of Oracle recently, and make a study summary here. 1, Oracle Database tuning can not only expect to modify a few database parameters to have a clear effect, the problem is more in the application, educating developers to correctly use the database is a heavy task. 2,
. 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
absrtact: by discussing and studying the characteristics and principles of Oracle Server and Client/server, this paper expounds some principles and methods of improving and adjusting the performance of Oracle Application system. Key Words: Oracle; client/server; system whole zone; network I/O; rollback segment.
local data, but only for those data that is not changed. Snapshots can also be used to dynamically replicate data between distributed databases, to define automatic refresh times for snapshots, or to manually refresh them to ensure referential referential integrity of the data. Invoking a remote procedure can also significantly reduce network congestion caused by frequent SQL statement calls. In summary, there is no single solution for all performance
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
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
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
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
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
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
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
Start building with 50+ products and up to 12 months usage for Elastic Compute Service
1 on 1 presale consultation
24/7 Technical Support 6 Free Tickets per Quarter Faster Response
Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.
A comprehensive suite of global cloud computing services to power your business
Payment Methods We Support
