Oracle

a large number of insert data below is inserted in the table tables 300,000 of data, if the first time to build the index is 57s, not indexed time is 58s, so and indexing and inserting data is not related. Insert into table Select 1, ' TMP ' | |

Introduction: This article provides a comprehensive overview of the relevant concepts of the Oracle execution plan, accessing data access methods, linking between tables, and more. and a summary and overview, easy to understand and memory! +++

Brief introduction: This article introduces comprehensively in detail OracleImplement the relevant concepts of the plan, access methods of accessing data, connections between tables, and so on. and a summary and overview, easy to understand and

Introduction to Oracle Databases First, introduce Oracle database systems are a set of software offerings at the core of distributed databases delivered by Oracle (Oracle), the most popular client/server (CLIENT/SERVER,C/S) or browser/server

Oracle asmlib Installation completed Unable to update configuration linkage The installation is installed, but still the error, not much Linux, step-by-step to find: Considering the impact of subsequent program use, the decision to reload First

The connection application of the database is an important knowledge point of each programming language, this article records how to connect the database under Python. The local environment is as follows: System: Windows7 64 bits Python version:

There are Node1 and node2 two Oracle RAC Machines, performed in Node1 Su-oracle Pwd mkdir ~/.ssh CD. SSH SSH-KEYGEN-T RSA Generate RSA keys and public passwords all the way to the carriage First to resolve the local password-free login CP Id_

The RAC nature is also a database, using a distributed lock manager. The DLM role is to coordinate competitive access to resources between instances, while competition within instances is the same as for single instances. In a RAC database, a node

According to business requirements, all objects under the test user on the database are replicated to a new user TEST2, but no table data is required. The idea is to first use the EXPDP content=metadata_only parameters to export metadata, and then

How to use the MyBatis pass list type parameter to the database stored procedure to implement the bulk insert data. MyBatis What to do when the parameter is a list type. As you all know, it's hard to get a lot of data out of MyBatis batch

Oracle | Pl/sql Unique index (unique Constraint) usage 1 target Demonstrates how to create, delete, disable, and use a uniqueness constraint with an example. 2 What is a uniqueness constraint. A uniqueness constraint refers to a constraint in a

Before creating a user name, you need to log on to the database as a user Administrator 1, to create a table space before creating a user: The format is: Format: Create tablespace table name datafile ' data file name ' size table space; For example:

October 14 to the electronic deployment system, with EXP, IMP Guide Library command successfully implemented the Oracle database export, import, in this case, also published a special article Oracle Database Export Import, explain the export, import

In the process of development and project deployment, we often encounter the need to import other people's DMP database to our own computer, then how this should be imported. Here are some simple steps: Enter the letter first, for example, if your

Ext: http://www.cnblogs.com/hustsay23/archive/2011/11/05/2237748.html The biggest difference between an Oracle database and SQL Server is that the latter is simple to accomplish. The graphical interface can be done step-by-step, and Oracle needs

Odac installation Method: Http://jingyan.baidu.com/article/e4511cf336ce872b845eafd4.html (1) to determine the installation directory: D:\Oracle11gR2Client;(2) Install ODAC package: only need to install ODP.NET4 component: Install.bat odp.net4

1. To optimize the query, you should try to avoid full table scan, first consider the where and the order by the columns involved in the establishment of the index. 2. The null value of the field in the WHERE clause should be avoided as far as

The method of judging the prime number, starting from 2, all except itself and 1, can not be divisible, is the prime number. Createor REPLACE FUNCTION IsPrime ( Num in number) Return BOOLEAN Is BEGIN IF (num return FALSE; End IF; For I in 2. (num-1)

CHAR, VARCHAR, VARCHAR2 difference:1. The length of the char is fixed, the length of the VARCHAR2 can vary, for example, the storage string "abc", for Char (20), which means that the characters you store will occupy 20 bytes (including 17 null

Uniqueness Constraint A uniqueness constraint refers to a constraint in a table in which a field or multiple fields combine to uniquely identify a record. Union field, you can include null values.Note: In Oracle, uniqueness constraints can have up