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First day of Oracle Database learning, first day of oracle Database Crud addition, deletion, modification, and query create read update delete1 -- oracle Database InstallationBy default, the system creates two user-defined sys and system password.Super administrator: sysAdministrator: systemPassword 56152 -- start the Database ServiceServiceListener 3 -- access t

Flashback in oracle and oracleOverview: Flash back is part of Oracle's powerful Database Backup recovery mechanism. When a logical error occurs in the database, flash back technology provides fast and minimal recovery (most flash back functions can be completed online in the database ). It should be noted that the flash back technology is designed to quickly restore logical errors. For errors caused by physical damage or loss of media, flash back tech

Briefly describe the query and Solution to deadlocks in Oracle databases, and briefly describe oracle Deadlock PrincipleIf you update or delete a column in a table in the database, this statement is not mentioned after the execution.The statement that updates this column of data is in the waiting state during execution,In this case, this statement has been executed, but it has not been successfully executed

Oracle-07445 [kgghash]: Oracle BUG causes the process to be killed when updating the LOB FieldSymptom:The user reports that a DB connection is accidentally killed. The following information is found in the alert Log during troubleshooting:Mon Apr 22 14:49:58 2013Exception [type: SIGSEGV, Address not mapped to object] [ADDR: 0x2B1733615000] [PC: 0x777EE03, kgghash () + 367]Errors in file/

This document describes how to install and create an Oracle database in silent mode. The User Creation, user group, and environment settings are the same as those for graphical installation. For specific settings, see the blog :. Silent Installation involves three steps: Silent Installation of oracle software, silent upgrade of oracle software, and silent creatio

Oracle foreign key cascade deletion and cascade update, oracle key level update Cascading Deletion Oracle has three behaviors: no action (similar to RESTRICT), CASCADE, and set null. The following uses the student-class as an example to describe how to delete Foreign keys in different situations. A student belongs to a class and the primary key of the class is t

Oracle session and connection optimization, oracle session 1. Modify the Oracle session and maximum number of connections 1. view the maximum number of connections SQL> show parameter processes; NAME TYPE VALUE-----------------------------------------------------------------------------Aq_tm_processes integer 0Db_writer_processes integer 3Gcs_server_processes int

Oracle control file multiplexing and oracle control multiplexing 1. Control File multiplexing 1. show parameter control-- View Control File InformationShow parameter spfile-- Check whether spfile exists.Create pfile from spfile;-- Generate pfileShutdown immediate-- Close the database2. Modify the pfile and add multiple paths.Vi $ ORACLE_HOME/dbs/initORCL. oraCopy the original controlfile to the newly added

Oracle _ view, oracle View Oracle _ view ① View1. A view is a virtual table.A view is built on an existing table. The tables created by the view are called base tables.The statement that provides data to the view is a SELECT statement, which can be understood as a stored SELECT statement.View provides users with another form of representation of base table data 2

Since Oracle9i, Oracle's external Table technology (Oracle External tables) has been greatly enhanced, with external tables accessing external data enhances the ability of Oracle databases and external data sources to interact with data, for data warehousing and ETL, These enhancements are greatly facilitated by data access. One of the most common examples for DBAs is the use of external tables to access w

The Oracle InStr function appeared in the recent project, so I looked up information about it on the Internet.Usage of InStr and SUBSTR in OracleUsage of instr in Oracle:The format of the InStr method isINSTR (source string, the string to find, starting with the first few characters, to find the ordinal number of the first match)Returns the location found and returns 0 if it is not found.For example: INSTR (' CORPORATE floor ', ' or ', 3, 2), the sour

Label:The recent need to maintain an ASP. NET program that was developed almost more than 10 years ago, encountered a variety of bizarre problems, the more difficult to identify the problem is recorded as follows: Question one: The same SQL query results in different queries on different servers. In the QA environment, the results are completely normal, while local, partial field values are DBNull. This is a very strange problem, the only rule that was discovered is that the field that appears

prevents inconsistent state of data due to the cross-execution of their operations commands when the concurrent execution of a transaction occurs. Persistence (Durability): When a transaction ends, its impact on the database is permanent, and the data is not lost even if the system encounters a failure. For a set of SQL statement operations to become transactions, the database management system must guarantee the atomicity (atomicity), consistency (consistency), isolation (isolation),

1, first you have to install the Oracle database server and client software, in the installation process to be aware of, select the Oracle installation directory, remember not to use the Chinese directory or a directory with spaces.：Http://hi.baidu.com/dashuaiwang/blog/item/42f8e7fab96978d6b58f314b.html/cmtid/d5bba9190dd0904a42a9ad772, after the installation, you will be prompted to remember something. That

RedHat EL5 Installing the Oracle 10g RAC--oracle Software InstallationSystem environment:Operating system: RedHat EL5Cluster:oracle CRS 10.2.0.1.0Oracle:oracle 10.2.0.1.0: RAC System Architecture650) this.width=650; "src=" Http://s3.51cto.com/wyfs02/M00/26/28/wKioL1Np_tziLDXcAAGvUOVml00321.jpg "title=" Rac.png "alt=" Wkiol1np_tzildxcaagvuovml00321.jpg "/>Third, install orancle softwareOnce the CRS is built

Label:64-bit operating system how to use Plsql to connect remote or local Oracle data in the case of locally installed Oracle databasesCurrently Plsql only supports 32-bit Oracle clients, how can I use Plsql to connect data with a 64-bit Oracle database installed locally?1) first page to install the 32-bit

Label: Oracle 's system is too large, for beginners, it is inevitable that there is a feeling. After a semester of learning to have some in-depth understanding of Oracle learning, because previously learned Some basic knowledge of Oracle, so learn to get started faster. This Oracle Project has allowed me to re -use

Abstract: This article describes how to install the oracle9.2.0 database in the RedHat Linux9 environment. Keyword: oracle9i RedHat Linux9 Kernel Parameter environment variable Oracle817 is always used in the RedHat linux7.1 environment. Sort out the system a few days ago and upgrade it as a whole. Install Oracle9i in the RedHat Linux9 environment. It took several days to find a lot of materials and posts on the internet, sort them out, and finally install oracle9.2.0 (Oracle9i Enterprise Editio

Manually uninstall Oracle in Windows and oracle in windows There is a problem with uninstalling the Oracle Al Installer that comes with Oracle: it is not clean, not complete, and there are some residual registries, which will affect subsequent installation. Therefore, we recommend that you manually uninstall

Oracle Study-aix6.1 Building Oracle 10GR2 RAC (5)First, install Oracle softwareInstall as Oracle:650) this.width=650; "Src=" http://img.blog.csdn.net/20160401111416770?watermark/2/text/ Ahr0cdovl2jsb2cuy3nkbi5uzxqv/font/5a6l5l2t/fontsize/400/fill/i0jbqkfcma==/dissolve/70/gravity/center "Style=" Border:none; "/>650) thi