Database Administrator

Primary Key of the InnoDB Storage engine table In the InnoDB Storage engine, tables are organized and stored in the order of primary keys. In an InnoDB Storage engine table, each table has a primary key. If the primary key is not explicitly defined

Notes about MySQL Indexes Index In fact, the data in the database is stored by page.In fact, indexes are stored by page.Therefore, in essence, indexes also occupy hard disk space (in exchange for the greatest benefit with the minimum

MySQL 8.0.4 RC: Be careful when using auth_socket! The news from the latest MySQL 8.0.4 RC (Candidate edition) is indeed exciting. Unfortunately, for auth_socket plug-in users, the danger is waiting! As early as November 2015, it was reported that

Use phpmyadmin to set mysql permissions. Step 1: log on to the root user. Step 2: Create a new data table and select a sorting rule. Here we use testtable. Step 3: Create a new user and enter the relevant account name and password. Step 4:

Redis Data Structure Type introduction, redis Data Structure Type----------------------------------------- Redis Data Structure Type -------------------------------------------------------------------I. string type1. Set the valueSet key value (if

Flask and MySQL configuration operations, flaskmysql Configuration Running environment:Centos6.7; python 2.7.11; Fix the bug by writing it above:SQLALCHEMY_DATABASE_URI is written as SQLALCHEMY_DATABASE_URL, which is extremely concealed;Write

Table created. ID NAME---------------1 abc2 bc3 c SQL> select id, name from rev where name like '% bc ';ID NAME---------------1 abc2 bcExecution Plan----------------------------------------------------------Plan hash value: 3205185662 | Id |

I. Principles of MySQL master-slave Replication 1. mysql replication process: each time a write operation is executed, it will save a copy to its own database. At the same time, this write operation will also be stored in a binary log file, and save

Ibm ids-Informix Dynamic Server is a key-type general-purpose OLTP database for enterprises and working groups. Large and small enterprises that need transaction databases are now deploying IDS to solve real-world business problems.* Enterprise

1: Brief Introduction MongoDB is a distributed document database that supports a master-slave structure similar to a relational database. It stores documents in binary Json format, without locks, transactions, and indexes. 2: Installation

This function will be deleted in the next version of Microsoft SQL Server. Do not use this function in new development work, and modify the application that is currently using this function as soon as possible. Address Window Extensions (AWE) Allow 3

Where 1 = 1 & where 0 = 1 is often seen in SQL statements. After seeing it, I don't know what it means. I don't know the role of this statement, here I will give you one by one ...... Where 1 = 1; this condition is always True. In the case of an

Hardware The root of aiming speed To increase the speed of your database program, you will naturally think of the basic parts that affect the speed. We will start from processing these parts. When you try to improve the performance of your database

Before Oracle9i Database, if the default tablespace is not specified during user creation, it will be the SYSTEM tablespace by default. If you do not explicitly specify a tablespace when creating a segment, this segment will be created in

Users can pay attention to several common Oracle backup problems. First, backing up an Oracle database includes not only physical data backup (copies of database files ), it also includes Logical Data Backup-data export using SQL commands and

ORA-12545 Errors often occur when a remote client connects to the RAC database over a uniform service name. SQL> CONN NDMAIN @ nuagerac enter the password ***** connected.SQL> CONN NDMAIN @ nuagerac :******ERROR: ORA-12545: connection

SQLServer2005 and later versions provide a database image monitor, but the method for enabling it is quite special. With the graphic interface, the maintenance difficulty and cost of the SQLServer database image are greatly reduced. 1. First, open

Monitor database performance SET TIMED_STATISTICS = TRUE in the init. ora parameter file and alter session set statistics = TRUE in your SESSION layer. Run svrmgrl and register it with connect internal. During the normal activity of your

Starting from version 8.2, DB2 users can specify a locking policy for each DB2 session. In previous versions, you can only configure an application by configuring the Database Configuration Parameter LOCKTIMEOUT. If you cannot obtain the lock, how

To configure transparent gateway for Sybase 1. Install Sybase client on the server where Oracle is located (or install Oracle and Sybase servers on the same server) to ensure that the Sybase database can be accessed; 2. Install the transparent