Oracle

Common levels of RAID are 0, 1, 3, and 5. The combination is usually 0 + + 0. Their respective features are described as follows:Raid0: Multiple physical disks are made up of a large Logical Disk with the total capacity of each disk. RW has the best

1. in versions earlier than 11g, Oracle's RMAN is not closely integrated with other log application systems. Therefore, when RMAN deletes archived logs, it does not determine whether the log is still useful to other systems.When RMAN deletes the log,

Oracle rownum Analysis For the rownum problem in Oracle, many documents do not support>, >=, =, between... and. The preceding symbols can only be used (,> =, =, .. and will prompt SQL syntax errors, but often cannot find a record, and it seems to

Oracle nested representation example ---- Nested table: defines a field in a table as a table. The data in this field table is stored in an external table, For example, the data in the next nested table is stored in the required_tab table. ----

Select distinct (nls_charset_name (charsetid) characterset,Decode (type #,1,Decode (charsetform,1,'Varchar2 ',2,'Varchar2 ','Unkown '),9,Decode (charsetform,1,'Varchar ',2,'Nchar vary ','Unkown '),96,Decode (charsetform, 1, 'Char ', 2, 'nchar',

A varchar, nvarchar, The four types belong to the variable-length character type. The difference between varchar and varchar2 is that the latter occupies two bytes of all characters, and the former only occupies two bytes of Chinese characters and

Step 1: Create a new test table as follows: Create Table king(ID number (10 ),Name nvarchar2 (2000)) Step 2: Create a sequenceCreate sequence king_tb_seqMinvalue 1Max value 9999999999Start with 21Increment by 1Cache 20; Step 3: Create a trigger

Importing and exporting Oracle Data imp/exp is equivalent to restoring and backing up ORACLE data. The exp command can export data from the remote database server to the local DMP file, and the IMP command can import the DMP file from the local to

The kernel. shmmni parameter controls the total number of shared memory segments.The kernel. Shmall parameter controls the number of pages in the shared memory and is the total amount of shared memory that can be used by all users.Shmall =

Author: eygle | English version [indicate the source and author information and this statement in hyperlink form during reprinting] Link: http://www.eygle.com/archives/2011/12/oracle_linux_rm_rf.html A mistaken deletion case mentioned a few days ago:

A project just a while ago is to port the database of SQL Server to Oracle. The requirement is to modify the original code so that the application can run on two different databases at the same time. This is my first attempt to operate Oracle using

Recently, the ETL project involved data import from the SQL Server database to the Oracle database. Many articles on the Internet use ORACLE transparent gateways, but since it is not free, I decided to use generic connectivity first. Most of the

D: \ oracle \ ora92 \ bin> sqlplus/nolog SQL * Plus: Release 9.2.0.1.0-production on Thursday August 16 11:32:22 2007 Copyright (c) 1982,200 2, Oracle Corporation. All rights reserved. SQL> Conn/As sysdbaConnected.SQL> alter user system identified

1. Add site count:Add to globalv. asax. CSProtected void application_start (Object sender, eventargs E){Application ["globalcounter"] = 0;} Protected void application_beginrequest (Object sender, eventargs E){Application. Lock ();Application

Oracle Text Search: (you must first create a context or ctxcat index, and then use the following) (you can add, score (10) before "from" to observe the score of the retrieved item) 1. Exact match and search of wordsSelect CBID, title (column name)

I. OracleAspect 1. Create an oracle Stored Procedure 1) create a table create table users(usesNo number,userName varchar(50)); 2) create a package Create or replace package multirefcursors Type test_cursor is ref cursor; Procedure getrecord

Oracle nested representation example (from: http://www.cnblogs.com/starzhao/archive/2010/05/19/1739234.html) ---- nested table: is to define the field in a table as a table, the data of this field table is stored in an external table, For example,

PL/SQL remote connection to Oracle Server appears ora-12541 TNS: no listening When error 12541 (no listening program) occurs, modify the app \ User \ product \ 11.1.0 \ db_1 \ Network \ admin \ listener. ora file. Listener =(Description_list

I have installed Oracle10g on the server many times and thought it was absolutely easy. But who knows that an error occurred while creating a database: "due to the following error, enterprise Manager Configuration failed-An error occurred while

Start ISQLPLUS**************************************** ******** [Oracle @ lacl-001 ~] $ Isqlplusctl ISQL * Plus 10.1.0.2.0Copyright (c) 2004 oracle. All rights reserved.Invalid arguments Unknown Command OptionUsage ::Isqlplusctl START | stop [Oracle