Database Administrator

XAMPP is green and will not be automatically started upon startup. Even in Linux, I still like green software. First install MySQL-Client in Ubuntu: Sudo apt-get install mysql-client Start mysql in XAMPP: Sudo/opt/lampp startmysql If you

I sorted out an SQL server exercise and learned how to familiarize myself with SQL SERVER. Problem description:Known link mode:S (sno, sname) Student Relationship. Sno is the student ID, Sname is name C (cno, cname, cteacher) Course

MySQL triggers are basically described in every Mysql tutorial, but I found that the tutorials are about how to process data from other tables. When writing a trigger in MySQL to operate the column data of this table, the writing method is different

Two common functions of MySQL, unix_timestamp () and from_unixtime PostgreSQL, are not provided, but they can be easily solved through the powerful scalability of PostgreSQL. The words are far away from the sky, and the documents are carefully read.

1. log on to the system as the root user first; 2. Shut down the MySQL service or process: service mysqld stop/killall mysqld; 3. privileged to start MySQL:/usr/local/mysql/bin/mysqld_safe -- skip-grant-tables & or mysqld_safe -- skip-grant-tables --

When PL/SQL is used for import, an error occurs: IMP-00032: the SQL statement exceeds the buffer length. IMP-00008: the exported file contains unrecognized statements. At first, I thought it was because the Large_Pool settings of the database

Although few users use the MySQL client in Linux to maintain data, there are now more MySQL client management software, and toad for mysql free is a well-known one. however, users who are familiar with using sqlplus to manage Oracle in UNIX still

After upgrading Ubuntu 9.10 and detecting MySQL startup failure, the following error message is written to the record file: Shell code Mysqld: error while loading shared libraries: libstdc ++. so.5: cannot open shared object file: No such file or

Welcome to phpMyAdmin 2.7.0-pl1 PhpMyAdmin tries to connect to the MySQL server, but the server rejects the connection. Check the host, user name, and password in config. inc. php and confirm that the information is consistent with the information

I. OverviewMongoDB is an open source database project based on distributed file storage. Written in C ++. It is designed to provide a high-performance data storage solution that can be expanded for WEB applications. MongoDB is a product between

How to evaluate a company's database O & M level? What is used for horizontal and vertical comparison? What is the goal of automated platform construction? The corresponding indicator system must be provided for guidance and must meet the following

Description of each process in Oracle Important processes: SMON, PMON, DBWn, LGWR, CKPT, and ARCn SMON: This process is used for data rediscovery. This process is mainly responsible for inspecting the system and cleaning the system,PMON: Used to

Table replication under the same Oracle user is also called table backup. Although it is called differently, it is essentially the same: Syntax: create table AB as select * from B This means that all copies of Table B are used to create table AB.

ErrorCaused by: org. hibernate. exception. ConstraintViolationException: cocould not execute JDBC batch updateORA-02291: violation of complete constraints (UNISPOWER. FK932556A9840256A3)-parent keyword not found Possible causesA field in Table A is

In some cases, for example, the listener. ora of the standby database needs to be configured for static registration when data guard is used. 1. listener. ora: [Oracle @ bys001 admin] $ cat listener. ora# Listener. ora Network Configuration File:/u01

After hive-0.11.0 came out, I learned that row_number was encapsulated. It is a great happiness for me who do not know java! Don't hesitate to discard 0.8.0! The specific upgrade steps are as follows: 1. Disable the processes currently being

This article introduces the RCFile Storage Structure in Facebook's data analysis system, which combines the advantages of Row Storage and column storage and plays an important role in large-scale data analysis in the MapReduce environment. Facebook

Configure the database environment, goldengate users, and install goldengate. For more information, see steps 1-4.Configuration required for Oracle-Oracle one-way replication using the Data Pump: -- Here I only configure to synchronize the test3

I. Shared pool function: cache the execution plan of SQL statements and SQL statementsSQL statement execution Step 3: parsing (parse) ------ execute (exec) ------ get data (fetch) Composition of the shared pool:Three regions: free, librarycache, and

Requirements: 1. A customer table named Pers, whose primary key is the customer ID persnbr; 2. The seven columns in the pers table have foreign key constraints; 2. In the pers table, 0.1 million pieces of data are generated in batches (persnbr> = 100