Oracle

first, the basic concept1, transaction (Transaction): is the basic unit of concurrency control. The so-called transaction, which is a sequence of operations that are either executed or not executed, is an inseparable unit of work. For example, a

Http://www.cnblogs.com/Ronger/archive/2011/12/19/2293509.htmlThe problem is as follows:Sql> Conn Scott/[email Protected]_databaseConnected to Oracle Database 11g Enterprise Edition Release 11.1.0.6.0Connected as Scott。。。。。。sql> drop table

Oracle static monitoring and dynamic monitoring  A, what is registration? Registering is registering the database as a service to the listener. The client does not need to know the database name and the instance name, but only needs to know the

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Reference: http://blog.csdn.net/huzia/article/details/7616717Create environment variables, determine SID$ vim Rman. Env export Oracle_sid=rmanexport oracle_base=/opt/oracleexportoracle_home =/opt/oracle/11gLoad Environment variables$ source Rman.

　　Oracle is also one of the most commonly used databases, is it sometimes tricky to back up? Save the following information, I believe it will help you.I. Common BACKUP commands1.list backup; Lists all the back up information in the database.2.list

The 3 files of the Listener.ora, Tnsnames.ora, and Sqlnet.ora are the 3 main files that are related to the ORACLE network configuration and are placed in the $oracle_home\network\admin directory. Where Listener.ora is related to the database server

Transferred from: http://blog.sina.com.cn/s/blog_af26e333010194ht.htmlA recent modification of an Oracle trigger encountered two problems in the process:Select LastName from Hrmresource where ID in (waigaunyanshourens);This SQL as long as the

Oracle RAC is a clustered database that allows for seamless failover of load balancing and failures. How do you know that the RAC database has implemented these features, and then perform a functional test on this?One, load balancing testThe load

Delete Oracle Directory OCI.dll file cannot be deletedReady to unload 10g in the virtual machine today.Install 11g to study some new featuresUninstall the uninstall tool that is not available with your ownBefore watching warehouse's lecture

Transferred from: http://blog.csdn.net/laoshangxyc/article/details/8615187Continuous update ...Oracle AWR Report Detailed DB Name DB Id Instance Inst Num Startup Time Release RAC ORCL

In the process of data migration, we face two common hang-live scenarios:1. The table cannot modify the Add field and cannot increase the length.2. Stored procedures cannot be overwritten. Scenario 1: Adding a field to a table hang

The most important thing about Oracle tree queries is the Select...start with ... prior syntax. Depending on the syntax, we can list a table-shaped structure in the order of the tree. Below is a list of common query methods for tree queries in

Recovering an instance in a catastrophic environment of an Oracle database (1) The so-called catastrophic means that all database-related files are lost or damaged due to disk faults or other causes and cannot be repaired. Backup must be used for

Oracle uses comment statements to add Table CommentsThe oracle comment statement can be used to add remarks to tables, fields, views, and other objects.Syntax:Comment on TABLE table_name IS 'Remarks ';Permission requirements:By default, users can

SQL: Oracle simple table, oraclesimple -- Oracle 9i data script address: $ oracle_home/rdbms/admin/utlsampl. sqlCREATE table dept (deptno number (2) CONSTRAINT PK_DEPT primary key, DNAME VARCHAR2 (14), LOC VARCHAR2 (13); create table emp (empno

Temporary instance processing is disabled when 80 w data is removed at a time Recently, When I deduplicate a million data business table, the de-duplication operation was stuck. The following is a simple review. 1. query the data volume of the

ORACLE 11G trigger debug record Error: PLS-00201: identifier 'sys. DBMS_SYSTEM 'must be declared  1. The trigger content is as follows: CREATE OR REPLACE TRIGGER"LOGON_DENIED_TO_ALERT"AFTER servererror ON DATABASEDECLAREmessage VARCHAR2(168);ip

Oracle latest SQL adequacy drill 1 Drop table example; create table example (ID Number (4) not null, name varchar (25), constraint example_id primary key (id); drop SEQUENCE example_sequence; create sequence example_sequenceINCREMENT BY 1 -- add

Oracle basic query statements and Instances1. query all columnsSelect * from table name;2. query the table structureDesc table name;3. query specified ColumnsSelect ename, sal, job from table name;4. View All Tables and fields in oracleGet