Oracle

Oracle merge into usage example   Purpose:Merge into solves the problem of using data from Table B and new table A. If table A does not exist, the data from Table B is inserted into Table; Syntax: Merge into [your table-name] [rename your table

next_day (date, char): returns the date of the first day of the week (specified by char) after the specified date (specified by date). Char can also be 1 ~ Replace 7. 1 indicates Sunday. Duzz $ Scott @ orcl> select sysdate, to_char (sysdate, 'day')

1. Create a New tablespace:Create tablespace newxxt Datafile '/Oradata/dduyoung/newxxt1.dbf' size 200 m autoextend on next 10 m maxsize unlimited, '/Oradata/dduyoung/newxxt2.dbf' size 200 m autoextend on next 10 m maxsize Unlimited Extent management

Instr usage is transferred from the http://www.cnblogs.com/Xrinehart/archive/2005/04/21/142791.html. Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/-->The format of the instr method is Instr (source

EBS R11 creates a view with client_info filter conditions to implement multi-ou shielding, R12 uses VDP (Virtual Private Database) for implementation. The associated package is mo_global and org_security.   Suppose we want employees to only view

The trunc () function is composed of two types: 1. trunc (for dates)The date value intercepted by the trunc function for the specified element.The syntax format is as follows:Trunc (date [, FMT])Where:Date: A date value.FMT date format, which is

Document directory Automatic database startup and shutdown on other operating systems SQL> select * from V $ version; banner production Oracle Database 11g Enterprise Edition Release 11.2.0.1.0-64bit production PL/SQL release

Four constraints: Disable novalidate neither restricts new data nor verifies existing data, which is equivalent to disable Enable novalidate constraint adds data but does not verify existing data Disable validate restricts the addition of new data

    For details about how to use the expdp/impdp command, refer: Oracle expdp/impdp example Http://blog.csdn.net/tianlesoftware/article/details/6260138   Comparison between exp/IMP and expdp/impdp and some optimization items in

    During Oracle 11g installation, the following two problems are frequently encountered:   Oracle 11gora-00845: memory_target not supported on this system description Http://blog.csdn.net/tianlesoftware/article/details/7256984   [Ins-35172] target

  From: http://levicorp.com/2009/05/22/how-to-kill-the-running-job/     1. Check the running job (from here you will get the SID thatrunning the job) SQL> SELECT * FROM DBA_JOBS_RUNNING; 2. Make job become broken/offline BEGIN

I plan to play RAC on the virtual machine, Google a pass, found that most of the information is based on this post (http://www.itpub.net/thread-1009235-1-1.html), using VMware Server to create bare device-based shared storage, oracle official

Bind peeking is a new feature introduced in Oracle 9i and continues until Oracle 10g R2. It is used to view the value of the current SQL predicate during hard Analysis of SQL statements. To generate the best execution plan. In versions earlier than

Having is mainly used to filter grouped data, Generally, we connect the aggregate function (sum, Count, etc.) after it ), In addition, we can use the fields following group by to form the having filter conditions.   SQL> select * from Dept; deptno

When we define a very complex cursor, this cursor takes a long time to execute. During the execution of this cursor, other users modify the data of the table referenced by this cursor, does cursor get the data before or after modification? the

Adaptive cursor sharing adaptive cursor sharing or extended cursor sharing (Extended cursor sharing) is one of the new features of Oracle 11g. It is mainly used to solve previous versions In this example, the SQL statement cannot obtain the best

You can view an all_parameters table in dbsnake's blog. You can use this table to view hidden parameters. But I confirmed later that this table is not available. Therefore, this is a view created by dbsnake.   How to view Oracle parameter categories

One mistake can lead to a lot of work. when you 've installed Oracle Database 11g, you can't change the Windows hostname without reinstalling Oracle Enterprise Manager. these are the steps: 1. change the % ORACLE_HOME % \ Network \ admin \

Test code: Connected to Oracle Database 11g Enterprise Edition Release 11.1.0.7.0 connected as xxpo SQL> Create or replace type color_tab_t as table of varchar2 (30 ); 2/ type created SQL> SQL> Create Table color_models ( 2 model_type

When declaring the varchar2 variable, we can specify its maximum length unit as char: V1 varchar2 (2 char); or byte: V2 varchar2 (2 byte );, Most of the default values are not specified: V3 varchar2 (2 );. So what are the differences between the