Install MySQL Enterprise Monitor
MySQL Enterprise Monitor is an Enterprise-level monitoring designed specifically for MySQL databases. It can be well integrated with various MySQL features, including: mySQL's key performance indicators, hosts, disks,
MySQL transaction processing and lock mechanism
1. Transaction Processing and concurrency
1.1. Basic Knowledge and related concepts
1) All table types can use locks, but only InnoDB and BDB have built-in transaction functions.
2) use begin to start
In windows, the gpt format of the shared disk and disk in oracle rac is racgpt.
The current disk is not worth the money. Therefore, a LUN mapped from the storage to the host may be very large.
Recently I encountered a problem: Two windows hosts
Difference between DBMS_UTILITY.GET_TIME and DBMS_UTILITY.GET_CPU_TIME, dbmsutility
Comparison between DBMS_UTILITY.GET_TIME and DBMS_UTILITY.GET_CPU_TIME
Http://www.oracle-developer.net/display.php? Id = 307
Developers have been familiar with
MySQL 5.6.22 installation tutorial, mysql5.6.22
MySQL5.6.22: Click to download
1. Run the mysql-installer-community-5.6.22.0.msi installation package
2. Developer Default installation type
Server only acts as a Server
Client only serves as the
Trigger creation traps
The creation of Oracle triggers differs from the creation of stored procedures, functions, and packages.
Trap 1:
The current schema is inconsistent with the trigger owner.
For example:
The current login schema is R5_T150, and
Install MySQL-server-5.6.22 log in Linux, mysqlserver5.6.22
I recently learned how to install Mysql, read a lot of online materials, and said that many methods of First Login with root fail.
I checked the Installation Log carefully. In fact, people
Summary of oracle flashback database, oracleflashback
Flashback database is a very important feature of oracle databases. Compared with the function of retrieving historical versions of table data through undo and executing logical error recovery,
Single quotation marks are required in SQL statements.
There are two single quotes in the SQL statement conditions, but they are enclosed by single quotes,
For example, select * from control where column = ''if the condition in column is exec
MySQL "Bind on TCP/IP port: Address already in use", mysqlbindRecently, a MySQL instance has been added to the server where MySQL Enterprise Monitor has been deployed. As a result, the MySQL Enterprise Monitor Instance becomes abnormal and cannot be
Oracle reported error when importing imp data: ORA-12592: TNS: Package error, ora-12592tns
Original Works are from the blog of "Deep Blue blog". You are welcome to reprint them. Please note the following source when reprinting them. Otherwise, you
NoSQL data model (2) nosql document modelBackground "document" is the main concept in the document database. Such databases can store and obtain documents in the XML, JSON, and BSON formats. These documents have subattributes and a tree-like data
MongoDB shell obtains the maximum and minimum values. mongodbshell
MongoDB does not find a dedicated method to calculate the maximum value, but it can be replaced by sorting and getting the first one.
The following collection data is as follows:
{ "
Sqlserver change tracking case and sqlserver tracking case
Create database testgouse testgocreate table t1 (sid int identity (200) not null primary key, sno int not null, sname varchar () goinsert into t1 (sno, sname) values (101, 'wind ') goALTER
Install oracle10 in SUSE Linux and solve the problem. suseoracle10
I have summarized my experience in installing oracle10g on Redhat5.5 and SUSE10.1.
When SUSE10 is installed with OraRun, the oracle user, oinstall group, and dba group will be
Data Source (connection pool), data source connection
Data sources are generally implemented from javax. SQL. dataSource interface, Spring, Struts, Hibernate and other frameworks all have their own data sources. Tomcat also has built-in data
Plsql developer inserts Chinese garbled characters, plsqldeveloper
Address: http://yanwushu.sinaapp.com/plsql-developer-chinese-charactereset/
Solution 1
The oracle character set cannot store Chinese characters. The following statement queries
Database Operation Specifications and database specifications
This article is an original article. For more information, see the source:
Http://blog.csdn.net/msdnchina/article/details/42780787
1. When writing data to a database, use the nohup
Database index Principle
I. What is an index?
An index is a disk structure associated with a table or view, which can accelerate the speed of retrieving rows from a table or view. An index contains keys generated by one or more columns in a
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