Oracle

Reference:http://blog.itpub.net/26524307/viewspace-1063925/View version:[Email protected] yum.repos.d]# lsb_release-aLSB Version:: base-4.0-amd64:base-4.0-noarch:core-4.0-amd64:core-4.0-noarch:graphics-4.0-amd64: Graphics-4.0-noarch:printing-4.0-amd6

There are 4 types of Oracle integrity constraints: disable novalidateenable novalidatedisable VALIDATEenable VALIDATE Disable novalidate does not validate both the original and the new data. For read-only tables for improved performance. This state

This stage, has been learning Oracle, feel a lot of harvest. I worked in the company, at that time to do client development, every day in the PL/SQL statement, modify SQL statements, do statistics to do query, at that time used very skilled, check

Oracle local services by default, the use of computer resources, affect the boot speed, each turn off more cumbersome, the following with bat one key implementation, right click, Run as Administrator@echo off for/f "skip=3 tokens=4"%%i in (' sc

First, the preparatory workTo create a table space:Create temporary tablespace yangwen_tempTempfile ' D:\oracle\oradata\orcl\yangwen_temp.dbf 'Size 50mAutoextend onNext 50m maxsize 20480mExtent management Local;Create Tablespace

OverviewIn daily life, our use of the for update is still relatively common, especially in the manual modification of data in the case of PL/SQL developer.It is only convenient at this point, and the true meaning of the for update lacks

Field CommentSELECT * from User_col_comments;Table notesSELECT * from User_tab_comments;Query field typeSelect Column_name,data_type,data_length from User_tab_columns where table_name= ' TableName ' and column_name in (' age_id ', ' month_id

Demand:There is a table in the project that probably has 7000多万条 data, causing the tablespace to be full and some data to be cleaned up to 30 million.2 B Procedure:Delete from table_name where ID > ' 40000000 ';Note: SELECT COUNT (1) from table_name

1, check the user's proifle is which, is generally default:SQL>SELECT from Dba_users;2. View the password expiration settings for the specified profile (such as default):SQL>SELECT*fromWHERE s.profile='DEFAULT ' and

1, version-based redefinition function (only R2 version)2. Force option for CREATE TYPE (only R2 version)3. Function Result Cache4. Continue statement: Exit the current iteration and continue looping the next iteration5. A sequence in a PL/SQL

Oracle General pagination is written asSelect A.id,a.title,rownum as Rn,a.create_time from (select A.* to temp a order by create_time Desc) A Where rownumNote: I'm using create_time to sort the create_time with equalIn order to vary the score page

(1) The concept of table space and partitioned tableTable Space:is a collection of one or more data files, all of which are stored in the specified table space, but are primarily tables, so called table spaces.Partition table:When the amount of data

Oracle's processing of compressed data is based on database blocks, essentially by eliminating duplicate data in the database to achieve space savings.Specific practices:Compares all the fields or records contained in a block, where repeated data is

First, install the ODAC and configure the environment variablesAdd Reference "Oracle.dataaccess" to your projectCodeUsing Oracle.DataAccess.Client;public void Execute (){OracleConnection conn = new OracleConnection (connstring);Try{Conn. Open

[Oracle] database table structure command When writing project documents, you may need to write the database table structure. It is very inefficient to right-click the editor to view the table structure and copy rows in one row. You can view the

Oracle inspection script #!/bin/sh# Get HostnameHOSTNAME=`hostname`logfile=xunjian_`date +%y%m%d`.loghostinfodir=/home/oracle/xunjianif [[ ! -d $hostinfodir ]]thenmkdir -p $hostinfodirfidate >> $hostinfodir/$logfileecho " hostname " >> $hostinfodir/$

Linux Oracle service startup & stop script and Automatic startup After installing Oracle 10g R2 in CentOS 6.3 and restarting it, you will find that Oracle is not started on your own. This is normal because Oracle Installation in Linux does not start

Oracle Database creation process Since there is already a database instance in the current environment, this does not affect the creation of a new instance sun Current System instance [oracle@DBA2 dbs]$ env |grep ORACLEORACLE_SID=orcl1ORACLE_BASE=/u/

Oracle number type Scale is 0, oraclescale Today I encountered a very interesting problem caused by NUMBER Scale. I will use a simple test case to demonstrate this case. Suppose there is a TEST table with a field type of NUMBER, And I insert the

Oracle converts score rows into columns 1. The table contains the following data: Name Subject January February March Zhang San Chinese 30 40 50 Zhang San Mathematics 56 65 78