Database Administrator

MySQL performance tuning primer script is a simple and easy-to-use mysql optimization tool. In fact, it is a shell script. Download: $ Wget http://www.day32.com/MySQL/tuning-primer.sh Run $ Sh tuning-primer.sh all After running the command, you

DB2 database commands 1. Start the database Db2start 2. Stop the database Db2stop 3. Connect to the database Db2 connect to o_yd user db2 using pwd 4. Read Database Management Program Configuration Db2 get dbm cfg 5. Write Database Management

The following error is reported in the Oracle warning log: ReferenceORA-00600: internal error code, arguments: [ttcgcshnd-1], [0], [], [], [], [], [], [], []Current SQL statement for this session:Select value from NLS_INSTANCE_PARAMETERS where

Mysqldumpslow:Died at/usr/local/mysql/bin/mysqldumpslow line 161, <> chunk 236. Conclusion: The number of top jobs is too large, and mysqldumpslow cannot be traversed. /Usr/local/mysql/bin/mysqldumpslow-s-t 15/root/db01-102-slow.log 1. Try removing

In the first two articles, we described the backup and recovery solutions for Small and Medium databases using RMAN catalog, all related scripts are provided to simulate Oracle Data Guard to a certain extent in a car to reduce database losses on the

Today I read a book about nodejs, which contains the knowledge required to use the mongoDB database. Before learning about this knowledge, install mongoDB first. The following are the installation steps, hoping to help you install mongoDB. 1.

Chapter 1 Meet HadoopData is large, the transfer speed is not improved much. it's a long time to read all data from one single disk-writing is even more slow. the obvious way to reduce the time is read from multiple disk once.The first problem to

Recently, the company has changed the computer, and the 10 Gb memory is still quite powerful. First, the Oralce runtime environment is installed on the local machine. I thought it would be very smooth, but there were still some minor problems,

Transaction Concept A transaction is an atomic SQL query statement and can be considered as a unit of work. If the database engine can successfully apply all query statements to the database, it will execute all queries. If any query statement

1. Database Security 1, ms SQL Server database security Sa-level users are not allowed to connect to the database on the Web. Solution: Delete the sa user and create a new user with the sa permission. the user name and password are as complex as

Editor's note: Is DataReader or DataSet used? First, you need to know the similarities and differences between them and the applicable working environment. After learning about this information, you can easily solve the problem when to use it. The

Introduction: In Step-by-Step design of your database 3, we discuss the components and semantics of the basic object link model. These concepts are very important and are the basis of today's lecture. Before starting this article, we suggest you

The nature of Indexes MySQL officially defines indexes as: indexes are the data structures that help MySQL efficiently obtain data. Extract the sentence trunk to get the essence of the index: Index is the data structure. We know that database query

The Informix Dynamic Server provides two levels of access privileges to ensure database security. Database privileges control the access to the database and the right to create tables and indexes on the database. TABLE privileges specify the actions

In a large database, performance has become one of the focuses of attention. How to Make the efficient and effective operation of the database become an issue that must be considered by database administrators and developers. Performance is the

1. Introduction There are two difficulties in realizing the function of tape backup data: first, ms SQL Server (SQL) the overall backup and recovery functions of the provided database cannot directly meet the requirements of the system for data

Security Vulnerabilities Databases distributed throughout the company collect and store a variety of key personal privacy data, such as social insurance numbers, credit card numbers, birthdays, and bank account information, at the same time, the

There are many reasons for slow query speed in SQL Server databases. The following are common causes: 1. No index or no index is used (this is the most common problem of slow query and is a defect in programming) 2. Low I/O throughput, resulting in

I. Control File multiplexing features The principle of multiplexing is actually very simple, that is, the control file is stored in multiple disk partitions or multiple hard disks on the database server. When the database system needs to update the

Oracle elastic uard is a database-level HA solution. Its primary functions include redundancy, data protection, and fault recovery. When the "transaction consistency" of the production database is used, the physical full backup (or physical COPY) of