Oracle

Turn from: http://lzkyo.iteye.com/blog/692680 indexes and corresponding tables should be located in different tablespaces (primary key (ID) using index tablespace mytable_index), and Oracle can read data on different hard disks in parallel to avoid

sql> clear screen;#创建库表Sql> START E:\SQL. SQL;18;Table has been created.Sql> select Table_name,tablespace_name from User_tables;TABLE_NAME Tablespace_name------------------------------ ------------------------------Tb_mtbasicinfo

Nls_lang format: Nls_lang=language_territory. Client CHARACTERSET 1, Nls_lang parameter composition The Nls_lang parameter consists of the following sections: Nls_lang=_. The meaning of each part of the Nls_lang is as follows:

Oracle system backup and recovery scenarioI. Overview 1.1 Concept of backup Backup is the process of copying a database to a dump device. Where a dump device refers to a tape or disk that is used to place a copy of a database. What kind of

Employees table: Department Table: Select E.last_name,e.department_id,d.department_name From Employees E LEFT OUTER JOIN Departments D On (e.department_id = d.department_id); Select E.last_name, D.department_name From Employees e,

Oracle Incomplete recovery means that the recovered data is lost and some data cannot be recovered. Environment: Os:rhel 6.0 Db:oracle 10.2.0.1.0 1, first there is a backup of the database here is the full preparation of Rman[Oracle@rhel ~]$ Rman

The comment on command in Oracle is used to describe the table or field, and the syntax is as follows: COMMENT on {TABLE [schema.] {table | view} | COLUMN [schema.] {table. | view. | materialized_view.} Column | OPERATOR [schema.] OPERATOR |

Oracle Cluster (RAC) startup and shutdown The following points need to be noted when Oracle RAC starts and shuts down: First, check the shared device Second, automatically start RAC and check related processes Third, manually start RAC In the

The Al32utf8 character set is not a (display/input) language character set, is a character set for storage and supports the world's leading language encoding. Al32utf8 is a superset of ZHS16GBK. The Nls_lang should be set to the language

several ways to start \ Close Oracle Database There are a number of ways to start and close Oracle. Here are only 3 ways to do this: L Sql*plus L OEM Console L Windows Console 1. Take Sql*plus as an example: A. Preparation First, we use Sql*plus to

Oracle Parallel queries parallel query Bayi 53,5297 p_base_day_i_newtareduser 2009-06-25 17:28:56 2009-06-25 18:24:21 Insert Success Base53,5300 p_base_day_i_newtareduser_test 2009-06-25 17:29:31 2009-06-25 17:54:21 Insert Success BASE This is

Oracle Parallel parallel execution Operations 2009-08-22 17:16:08| Category: System Management Technology | reporting | font size subscription Introduction: The Oracle Parallel feature has not been a concern for the past. A few days ago a brother

Guide: 　　 First, the introduction: A rollback segment is a part of a database that records information about changes to the database. Use this information to implement the read consistency of the database and its recovery. If the rollback segment

1 Check Database connection information 2 Check the query's table name 3 View the permissions of the table and whether the currently logged on user has query permissions for the table. 4 ORACLE queries automatically convert uppercase so the

When you install Oracle, if you do not reset the password for the following users, the default password is as follows: User name/Password login Identity descriptionSys/change_on_install SYSDBA or Sysoper cannot be logged in as NORMAL as the default

What is the relationship between the Last_date and next_date in the job, and the interval, last_date the start of the job, or the end of the execution time. Next_date is the job start time or end time plus interval.If a job has a long execution time

Several ways to migrate Oracle databases We often need to migrate data, migrate to more performance-configurable host OS, migrate to remote rooms, migrate to different platforms, the following describes several Oracle database migration scenarios:

Oracle Data Pump detailed The Oracle database 10g uses data pump technology that enables DBAs or developers to quickly move database metadata (object definitions) and data to another Oracle databases.the role of data Pump export import (EXPDP and

In Oracle, start With...connect by prior clause usageConnect by is used in structured queries, and its basic syntax is:Select ... from tablename start with condition 1Connect by Condition 2Where Condition 3; Cases: SELECT * FROM tableStart with

Turn from: http://database.51cto.com/art/201010/231126.htm The Oracle Wm_concat (column) function is what we often use, and here's how you can use the Oraclewm_concat (column) function to implement a field merge if you are wm_concat for Oracle