Database Administrator

RMAN uses backup to transmit tablespaces The method for creating a tablespace set in the Oracle Database Management Manual requires that the tablespace transmitted during the execution of tablespace transfer should be opened in read-only mode. In

Use of MongoDB stored procedures and performance tuning Solutions Although MongoDB provides us with a lot of drivers, it is not convenient to use the mongodb shell. For example, the recently needed DBRef nested data must be CRUD. If the mog driver

Oracle uses a cursor to create a primary key statement for all user tables Application Scenario: adding an auto-increment primary key to a data table can speed up data table access, and is the fastest in integer indexing. This program is suitable

MySQL date type DATETIME and TIMESTAMPThere are three types of dates in MySQL5: DATETIME, DATE, and TIMESTAMP, except that DATE is used to indicate a DATE without time and second, and the other two have time and second. TIMESTAMP can also be

Win7 64-bit system Matlab access Mysql database (Details !), Win7matlabAccess Mysql database using Win7 64-bit system Matlab PS: I have read a lot of technical posts on the Internet that use Matlab to connect to Mysql, but there are always problems

Mysql transaction processing and mysql transaction Transaction processing is widely used in various management systems. For example, in the personnel management system, many synchronous database operations require transaction processing. For example,

Similarities and differences between a set computing report and a rundry report when processing a dynamic report. The centralized report inherits the macro mechanism of the rundry report to process dynamic reports. It is very convenient to use the

Definition and Application of pl SQL with parameter cursor, pl cursorCURSOR cursor_name (parameter_name datatype) IS select_statement; -- only the type can be specified and the specific size cannot be specified.OPEN cursor_name (parameter value

It is prohibited to modify anything that involves oracle during the production period ., Time period oracle This article is the original article, reproduced please indicate the source: http://blog.csdn.net/msdnchina/article/details/44560623 Warning:

When mysql is installed in windows and linux, the following error occurs: mysql 1045. In the past, mysql was not installed in windows, but some problems occurred during installation in linux. The 1045 error also occurred during windows Installation

Four major features of transactions: atomicity, consistency, isolation and durability (ACID), four major acid 1. Transactions Definition: a transaction is a sequence of operations. These operations are either executed or not executed. It is an

Mongo db windows installation, mongodb1. Download the installation packageHttps://fastdl.mongodb.org/win32/mongodb-win32-x86_64-2008plus-ssl-3.0.0-signed.msi? _ Ga = 1.22066811.15995322.16.142368396After the download is complete, place the

How can we improve the query efficiency in a ten-million-level database query ?, Search Efficiency How to improve query efficiency in a ten-million database query? 1) Database Design:A. to optimize the query, try to avoid full table scanning. First,

Modify tablespaces (modify the automatic scalability of data files) and Data scalabilityModify tablespaces (modify the automatic scalability of data files)When creating a tablespace, you can set the automatic scalability of the data file. When a new

Install Goldengate On Oracle Rac 11.2.0.4, goldengate11.2.0.4 Installation environment: source:OS：redhat 6.3DB:11.2.0.4 racOGG:11.2.1.0.1target:OS:redhat 6.3DB:11.2.0.4OGG:11.2.1.0.1 A single data transfer configuration from rac to a single machine.

Xinxing analyzes Server Management in Redis and Xinxing redis Redis was defined as a service process that can run continuously for a long time at the beginning of the design. Therefore, most system configuration parameters can take effect

SQL Optimization-logical Optimization-database constraint rules and semantics optimization, SQL Semantics 1) database integrity ① Entity Integrity (Entity Integrity): yourself A) a link corresponds to an entity set in the real world. -- ER

Oracle user unlock, oracle unlock Connect first SQL * Plus: Release 12.1.0.2.0 Production on Thursday February 12 15:40:422015 Copyright (c) 1982,201 4, Oracle. All rights reserved. Enter the User name: system Enter the password: Last Successful

MySQL Distributed Database Service middleware-Cobar Research 2, mysql middleware-cobar In this article, we will learn how to use the Cobar configuration.Scenario: The database name provided by the system is UserCenter, and there is a table

The. frm. myd. myi file in mysql,. frm. myi When I saw a program in the library management system yesterday, I found that the database files are MYI, frm, and myi files, which are not commonly used. SQL files, which have never been used before,