Oracle

First into this trip, the meeting is not difficult, difficult people will not, engaged for a long time to fix, summed up the installation sequence is best Oracle databse \orlacle Client (can be free) \ Plsql (can be installed)1, Oracle Database

Custom variablesvariable x varchar (20) Note: The variable x is preceded by a colon, which indicates that this is a variable.The x variable is set, and when the cmd window is closed, the variable is invalidated. [Glogin.sql]

[Email protected] init.d]# Vim Oracle#!/bin/sh# chkconfig:35 80 10# description:oracle Auto Start-stop script.## Set Ora_home to being equivalent to the $ORACLE _home# from which-Wish to execute Dbstart and Dbshut;## Set Ora_owner to the user ID of

Should be the DB computer is the DHCP dynamic IP changed the problem,1, modify the Listener. Ora is the current IP address or machine name2, modify the Tnsnames.ora under the current IP address or machine nameThe service failed to start, you can

often need to be in the database to generate documents, due to the way you prefer the script, so you need to use spool time to format, the following simple collation of the Oracle in the format of some of the things, a total of 18, in fact, the

Number data typeNumber (Precision,scale)A) precision represents a valid bit in the number, and if no precision is specified, Oracle uses 38 as the precision;b) If the scale is greater than 0, the number of digits to the right of the decimal point,

Related posts thinking and trackingThis article turns from RongerMaterialized views are a special physical table, and the materialized view is relative to the normal view. The normal view is a virtual table, the limitations of the application are

In the Plsql developer,Create user username identified by "password" after creating a good users, you need to assign permissions:Role permissions: DBA can grant defaultSystem permissions: Unlimited tablespace can be granted,Create tablespace, table

When you are working with multi-column grouping statistics, you can only generate statistical results based on all grouped columns if you specify grouping columns directly using the GROUP BY clause. If you use the ROLLUP statement or the CUBE

Database transactions are strictly defined and must meet 4 features:Atomicity (Atomic): Indicates that multiple database operations that comprise a single transaction are an indivisible atomic unit only if all the operations are successful, the

Summarize the Insert usage in Oracle1. Standard Insert-single row insertSyntax: INSERT into table [(Column1,column2,...)]   VALUE (value1,value2,...)    Example: INSERT into DEP (Dep_id,dep_name) VALUES (1, ' technical Department '); Note: Only one

Each block has a block header. There is a transaction table in the header of this block. Some entries are created in the transaction table to describe which transactions lock which rows/elements on the block. The initial size of this transaction

These two functions are offset functions that can be used to detect the next or previous value in the same field.The lead (Col_name,num,flag) col_name is the column name; num is the first value of the orientation; flag is a flag, that is, if the

Step 1: Use the following SQL to view the list of processes to determine which table is lockedSELECT DOB. object_name Table_name,lo. session_id| | ', ' | | Vss. serial# Delete number,Lo.locked_mode,lo. session_id, VSS. Serial#,vss.action

/*****************************************************************Reason: Because the original export database does not tidy up the table space which mainly includes two aspects,One is that the user generates too many deletes, causing the table's

Today, while maintaining the Oracle database, view the status of the listener and execute#lsnrctl statusError:-bash:lsnrctl:command not found. Not before, think carefully, the problem found, I was rooted telnet to the server, the maintenance of

There are two cursors in a stored procedure, and the second cursor uses the first value, so how is the stored procedure written? Here's an example:Create or replace procedure Dynamic_confirmAsCursor C1 is a select O.id,o.cno,o.icorpid,o.iroeid, O.LR

1. After installing the Oracle database: Execute Dbstart and Dbshut will prompt:[Email protected] ~]$ DbstartOracle_home_listner is isn't SET, unable to auto-start Oracle Net ListenerUsage:/u01/app/oracle/oracle/product/10.2.0/db_1/bin/dbstart

Oracle dual table and oracledual table A Dual table is generated by default when each database is created. The table has only one column and one row. 1) analyze the dual table as follows:   2) application: In the oracle database, the dual table

How to add foreign key constraints to Oracle databases The foreign key specifies that the values of one column (or a group of columns) must match the values of some rows in another table. We say this is to maintain the integrity of the associated