Database Administrator

Redis + Keepalived memory database cluster configuration Redis is an open-source log-type and Key-Value database written in ansi c language that supports Network, memory persistence, and provides APIs in multiple languages. Redis is a key-value

[Translated from mos] visit the well-known Data Providers for. NET and mosproviders of Oracle Database Applicable: Oracle Data Provider for. NET-Version 9.2.0.8 and laterOracle Providers for ASP. NET-Version 11.1.0.6 and laterMicrosoft Windows

SQL retrieves fields from two tables to form table data and then inserts it into the function table. SQL Fields It is difficult to describe how to achieve this effect. Here, I will first show the implemented effect in the form of a diagram. This is

Where, having, group by, order by, havinggroup   1. order by is sorted by a field. desc indicates descending order, and esc indicates ascending order.   2. group by is grouped by a field.   3. "Where" is a constraint declaration. Where is used

Linux Command skills, linux commands[Oracle @ rh64 ~] $ Cat lgrw.txt cat: lgrw.txt: No such file or directory [oracle @ rh64 ~] $ ^ Rw ^ wrcat lgwr.txt 18:03:19. 703928 times ({tms_utime = 27, tms_stime = 18, tms_cutime = 0, tms_cstime = 0}) = 433678

Use operating system commands to trace and trace listeners Strace tnsping prod Strace tnsping prod 2> & 1 | less Strace-eopen tnsping prod 2> & 1 | grep '=-1' Strace tnsping prod 2> & 1>/dev/null | grep-E '^ stat | ^ open' Strace-e trace = access,

Summary of Oracle functions in the first week of work, oracle functions in the first week 1.Oracle row-to-column and column-to-row The most common principle of Row-to-column conversion is the use of decode functions, Aggregate functions (sum () Max (

How to uninstall oracle11g and oracle11g Oracle 11g R2 x64 Redhat5 (rhel x64) 1. Use SQL * PLUS to stop a database [oracle@OracleTest oracle]$ sqlplus logSQL> connect / as sysdbaSQL> shutdown [immediate]SQL> exit2. Stop

An error occurred while inserting the database emoticons. First you have to look at this blog http://blog.csdn.net/u011575570/article/details/47048101Then handle the insert emoticons in the database.The processing of emoticon is just now utf8,

Mybatis Association, mybatisassociation Type = "busines. administer. cp. model. CPBookCategory">Type = "java. util. HashMap">SELECT id, name, is_parent, pid FROM cp. tbl_cp_category where pid =#{ value };]>Explanation: 1) the busines. administer. cp.

Summary of data migration experience-heterogeneous data migration with hundreds of millions of tables Due to the system revision, we have been doing data migration in the last three months. Due to the special nature of our business, we basically

An SQL statement may be a time bomb or a SQL time bomb. A small SQL statement may be a perfect statement when the data volume is small. But with the increasing data volume, can you think of the catastrophic consequences? So what SQL statements are

Mogodb connection test: mogodb connection -$ In db.Student.find({"_id":{"$in":[1001,1002,1]}}) -$ Or db.Student.find({"$or":[{"_id":99},{"pageViews":2}]}) -And or db.Student.find({"pageViews":2,"$or":[{"_id":99}]}) Cursor control for(i=0;i -Paging

Mysql row-to-column conversion using case when, mysqlcase CREATE TABLEbill( idCHAR (36) not null, customerINT (255) null default null comment 'customer ', shopINT (255) null default null comment 'consumption shop ', moneyDECIMAL () null default

How can I quickly delete duplicate data in mysql? Removing duplicates in mysql is actually a very simple task. Let's look at the following example: Mysql> drop table test;Query OK, 0 rows affected (0.01 sec) Mysql> create table test ( Id INT, Name

View the public network, private ip address, and oraclerac of each oracle rac Node----- Cluster private network connection information:Select * from gv $ cluster_interconnects;INST_ID NAME IP_ADDRESS IS_PUBLIC SOURCE----------------------------------

Oracle (II) --> View Details (I am afraid I can't understand the multi-graph in high definition ?), Oracle multi-graph1. What is a view.1. A view is a virtual table;2. A view is built on an existing table. The tables created by a view are called

ORACLE syntax-package, procedure, cursor, and oraclecursorExample of Chen kichao: Packet Specification Create or replace package PACK_WMS_YX IS -- Author: CKZ -- Created: 9:52:29 -- Purpose: synchronize data -- Public type declarations, CURSOR

In linux, mongodb3.0.5 and linuxmongodb3.0.5 are automatically backed up. In the last two days, data in the mongodb database should be backed up regularly due to the company's business needs. After checking a lot of information, I found that mongodb

Simplified fixed sorting of SQL computing and simplified SQL sorting In database application development, we often have to deal with complicated SQL-based computing. Fixed sorting is one of them. Fixed sorting is not in ascending or descending order