oracle performance tuning basics

Tags: Oracle performance optimization Oracle Optimization training Oracle Database Optimization Oracle Database Performance Tuning Oracle

The ORACLE tutorial is the basics of Oracle PL/SQL language. PL/SQL is an extension of ORACLE's standard database language. ORACLE has integrated PL/SQL into ORACLE servers and other tools, in recent years, more developers and DBAs have started to use PL/SQL. This article de

that can be recovered. If you do not have a COMMIT transaction, Oracle restores the data to the state it was before it was deleted (exactly before the delete command was executed) and when the truncate is applied, the rollback segment no longer holds any recoverable information. When the command runs, The data cannot be restored. So very few resources are invoked and execution times are short. (Translator Press: truncate only in Delete full table app

$02HISTORYALARM20140801USABLEIDX_HISTORYALARM$02HISTORYALARM20140802USABLEIDX_HISTORYALARM$02HISTORYALARM20140803USABLEIDX_HISTORYALARM$02HISTORYALARM20140804USABLEIDX_HISTORYALARM$02HISTORYALARM20140805USABLE...... You can see that the index of the partition HISTORYALARM20140731 has been marked as UNUSABLE.When an index is marked as unavailable, the optimizer ignores these indexes, and Oracle does not maintain these indexes when changing the table in

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

Oracle|sql Language Oracle Pl/sql Language Foundation 2002-8-23 Oracle Pl/sql Language Basics Pl/sql is Oracle's extension of the standard database language, Oracle has integrated PL/SQL into Oracle servers and other tools, and

The Oracle tutorial you are looking at is: Oracle SQL Performance Tuning Series Learning Ii. 4. Select the most efficient table name order (valid only in the Rule-based optimizer) The Oracle parser processes the table names in the FROM clause in Right-to-left order, so the

------------------------------------------------------------------------------------------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

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

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

Tags: database security Network technology database software computer data securityWith the popularization of computers and the development of the network, the database is no longer just the topic of the programmer. Oracle database is based on its excellent performance, easy to operate and flexible features, in the database market has occupied a place. But also with the continuous improvement of network tec

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

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,

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.