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Welcome to the Oracle community forum and interact with 2 million technical staff to enter the core IT business module. The importance of the database is uncertain. After the management database is deployed in the early stage of the system, during the continuous operation of the system, you must always pay attention to the potential impact and possible risks of t
-end enterprise database software. Oracle Database Engineer is one of the most urgently needed technical personnel in the enterprise, Oracle database Engineer is a high-paying career, the primary DBA has a salary of about 10W, and the intermediate DBA has a minimum annual sa
This chapter describes two main components of the Oracle 9i Network-the installation and configuration process of the database server and the management client. The purpose of this chapter is to help readers understand how to install Oracle 9i and how to configure Oracle 9i network environments. This book uses Windows
oracle| Process | data | database Oracle 9i Database Migration process Author: unknown Database movement, often occurs during the implementation of a project, and for experienced DBAs, database movement is very easy. But for so
The greatest difference between an SQL Server database and an Oracle database is the tablespace design. Oracle Database pioneered the design concept of tablespace, which makes an indelible contribution to the high performance of Oracle
In Oracle, fields of the LOB (LargeObject) type are more and more used. This type of field has a large capacity (up to 4 GB of data), and a table can have multiple fields of this type, which is flexible, applicable to business areas with a large data volume (e.g., archives, etc ). LONG, LONGRAW, AND OTHER TYPES In Oracle, fields of the LOB (Large Object, Large Ob
. This batch processing program can run in idle time to avoid conflicts between the program and other applications. If you can stick to the index planning, you can recycle unused space in time to improve the space utilization. Iii. Fragment of Oracle database performance segments When a database object is generated, a
technology that allows you to freely scale your server capacity to meet the flexibility of your enterprise architecture. In addition, RAC provides powerful reliability, recovery, error detection, and continuous operation support. • GoldenGate-Database Synchronization expert The GoldenGate option helps enterprise databases cope with heterogeneous complexity and heterogeneous challenges, and helps enterprise
index planning, you can recycle unused space in time to improve the space utilization. Iii. segment fragmentation When an Oracle database object is generated, a table or an index is used. The tablespace is specified by the user's default value or specified value. A segment generated in a tablespace is used to store object-related data. Before a segment is closed
Tags: defaults network desktop Oracle Linux1. Install Redhat operating system (version custom)(1) Installation table interview:Yum groupinstall "X window System"-yYum Groupinstall desktop-y2. Planning for storageOracle RDBMS installed locally (/oracle directory)Oracle datafile stored on storage (/oradata)3. Configure t
' configuration by default and connects to the sqlite3 database. development: adapter:sqlite3 database:db/development.sqlite3 pool:5 timeout:5000 iisp: adapter:oracle encoding:utf8 database:192.168.68.22/iisp.xjgz username:iisp916 password:iisp916 In iisp/database, the IP address is followed by the
flashback_on --------- ----------- ------------------ DBA 0 YES (4) Set initialization parameters: Db_flashback_retention_target: Sql>alter system set db_flashback_retention_target=1440 Scope=both; This parameter is used to control the time that the Flashback log data is retained, or the earliest point in time that you want the flashback database to recover. The default value is 1440, the unit is minute, that is, 24 hours, it should be noted tha
give a supplementary explanation. Even if, in reality, we use tools to modify SQL, such as the SQL statement after SQL EXPERT is modified, these are not only SQL statements with HINTS added, but also those with modified texts. They can also store OUTLINES and be exploited. However, this is not a definite effect. Let's test whether it works. However, even with OUTLINES, when the database is doing its best, the dat
from scratch when recovery fails.We know that the data file is the disk space reserved by oracle to the OS. If we applied for 50 GB when planning the databaseIt may only use 100 M, and we need less valid data for cold backup, maybe only 5 M, but we still have to back up 50 GB of data.This is the disadvantage of cold backup.During Cold backup, backup may be incomplete or junk data is backed up. Therefore, w
needed to build Web applications. Sample Application When users use your applications, collecting information about user operations becomes a popular mechanism to receive user feedback. In general, compared to any survey that allows users to clearly express their preferences, click tracking tools incorporated into online applications can provide you with a large amount of information about user preferences. Let's take a simple example. Suppose you want to select the title of three latest
because the data dictionary cache fails. MODIFICATIONS: displays the number of times data is updated in the data dictionary cache.3.3 adjust the size of the Shared Pool In general, the library cache hit rate should be higher than 99%, and the data dictionary cache hit rate should be higher than 90%. Otherwise, the size of the shared pool needs to be adjusted. Because the size of the database cache and the size of the data dictionary cache are not set
Oracledatabase, aka Oraclerdbms, or Oracle. is a relational database management system of Oracle Corporation. It is a leading product in the field of database. It can be said that Oracle database system is currently the world's po
Tags: asynchronous continuous article fail control file configuration snapshot breOriginal: http://www.talkwithtrend.com/Article/178339In the process of database construction, high availability is one of the most important concerns in the construction of data Center database in every enterprise, which is directly related to business continuity and stability. To do this job well, we must learn from its under
read-onlyAlter tablespace wdscrord_sep_2003 read only;5.Export metadata. Note that the constraint is not specified and the primary key must be rebuilt in the new database table.Exp file =/u01/product/Oracle/oradata/orcl/ws_sep_dat.dmpTransport_tablespace = y constraints = n tablespaces = wdscrord_sep_20036.Use RMAN to convert the data file to the little endian required for Linux transplantation.Convert tab
for that user. This is the reason why we see schema names as database user names under the Enterprise Manager scheme. A schema cannot be created in an Oracle database, and to create a schema can only be resolved by creating a single user (although there is a CREATE SCHEMA statement in Oracle, it is not used for creati
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