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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
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RAC special problems and combat experience (V) Overview: write down the original intent and motivation of this document, derived from the Oracle Basic operating Manual of the previous article. The Oracle Basic Operations Manual is a summary of the author's vacation on Oracle's foundational knowledge learning. Then form a summary of the system, a review review, the other is easy to use. This documen
$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
------------------------------------------------------------------------------------------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
How RAC Works and related components (iii) Overview: write down the original intent and motivation of this document, derived from the Oracle Basic operating Manual of the previous article. The Oracle Basic Operations Manual is a summary of the author's vacation on Oracle's foundational knowledge learning. Then form a summary of the system, a review review, the other is easy to use. This document is
Tags: color extend directory issues Oracle Database Insert Tutorial OCA official websiteArticle turned from: http://www.shsnc.cn/show-109-970-1.html For further details, refer to: http://xlsxwriter.readthedocs.io/tutorial01.html 1.Why do you want to generate graphs For Oracle database operations, sometimes it takes a week to see how the database is running, and
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
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
Oracle Database Programming, oracle Database tutorial 1. How to learn about Oracle 1. Database Administrator Manage Oracle (Start and Stop, database fault recovery)Improves Oracle performance
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.
The ORACLE tutorial is: Oracle SQL Performance Optimization Series 1. 1. select an appropriate ORACLE optimizer There are three optimizer types in ORACLE: A. RULE (RULE-based) B. COST (COST-based) c. CHOOSE (selectivity) Set the d
documents Oracle's three highly available cluster scenarios Introduction to cluster Concept: The Oracle Advanced Course--theoretical textbook Oracle one-off RAC Survival Guide Oracle 11gR2 RAC Management and performance optimization Article Navigation Introduction to cl
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
-typically for OLTP.(v) To save hardware costs, you can use a number of inexpensive PC servers instead of minicomputer mainframe, saving the corresponding maintenance costs.(vi) Scalability is good, you can easily add delete nodes, expand Hardware resources.RAC disadvantage(i) more complex management and higher requirements(ii) Poor system planning design performance may be less than a single node(iii) Software costs may be increased (per CPU charge)"
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