Multi-User concurrency and transaction processing in Oracle

Multi-User concurrency and transaction processing in Oracle Concurrent accesses to multiple Oracle usersTransaction: an inseparable operation acting on some data Lock: Write lock, mutex lock (can only be used by one process) read lock, shared lock

Use the dbms_flashback toolkit to implement the flashback query function

Use the dbms_flashback toolkit to implement the flashback query function Flashback Query is a convenient logical recovery function based on Oracle Undo expired data. With the support of Undo Tablespace, We can query the time version of a data table

Use the command line method to log on to SqlPlus. The password contains special characters and special characters of sqlplus.

Use the command line method to log on to SqlPlus. The password contains special characters and special characters of sqlplus. All hits!It's really hard to wait! Oracle 12c. If you want to log on to SQL plus, there is no graphical interface. a

HBase vs. MongoDB vs. MySQL vs. Oracle vs. Redis, the primary key of the three major open-source NoSQL databases, the two mainstream traditional SQL databases, nosqlredismongodb

HBase vs. MongoDB vs. MySQL vs. Oracle vs. Redis, the primary key of the three major open-source NoSQL databases, the two mainstream traditional SQL databases, nosqlredismongodb HBase vs. MongoDB vs. MySQL vs. Oracle vs. Redis, the primary key

Cross join usage in T-SQL (semi-translation), t-sqlcross

Cross join usage in T-SQL (semi-translation), t-sqlcross Suddenly I found a very hanging link. Let's take a look at what the database should do. be timid and cautious: DBA work content !!!! Today I will translate an article on T-SQL, this article

PL/SQL Developer configuration instructions, pldeveloper

PL/SQL Developer configuration instructions, pldeveloper PL/SQL Developer is an integrated development environment dedicated to the development of Oracle database storage program units. Nowadays, more and more business logic and application logic

Mysql13 Copy 2, mysql13 Copy 2

Mysql13 Copy 2, mysql13 Copy 2Replication management monitoring Show master logs;Check the second-level logs of the master database. The logname is the input parameter of other commands, and the file_size is the offset and the input

NoSql-MongoDB GridFS + ASP. net mvc implements upload and display,

NoSql-MongoDB GridFS + ASP. net mvc implements upload and display, The previous article introduced how to perform some simple operations on MongoDB in the dos window. However, no matter what you learn, you still need to apply it to your project,

Install adventure and northwind Sample Database, adventurenorthwind

Install adventure and northwind Sample Database, adventurenorthwind There are a lot of information on AdventureWorks database installation for help on the Internet. You can also find many answers to this question in baidu and google, but some of the

MySQL trigger, mysql trigger instance

MySQL trigger, mysql trigger instance Trigger: monitors a situation and triggers an operation. Four elements of trigger creation Syntax: 1. monitoring location (table) 2. monitoring event (insert/update/delete) 3. trigger time (after/before) 4.

NLS_LENGTH_SEMANTICS parameter extension problem, nlslengthsemantics

NLS_LENGTH_SEMANTICS parameter extension problem, nlslengthsemantics Due to the particularity of a project, there are two sets of development database environments, and both sides may make some modifications to the table structure. Therefore, a tool

Spread knowledge, share happiness-MySQL database development and optimization video, share happiness-mysql

Spread knowledge, share happiness-MySQL database development and optimization video, share happiness-mysql Today is July 22, September 11, a memorable day, praying for innocent lives that have passed away! This year's 500 anniversary since the

Mysql exports the query result to the csv method, mysqlcsv

Mysql exports the query result to the csv method, mysqlcsv To export the mysql query result as csv, you can connect to mysql using php to execute the query, and then use php to generate the csv format of the returned query result for export.

How to solve the error Repositories is not a valid short file name, visualsvnserver

How to solve the error Repositories is not a valid short file name, visualsvnserver An error is prompted during the installation of the latest version of visual SVN Server: "'Repositories 'is not a valid short file name ."Click OK to terminate the

Detailed description of distributed algorithms and NoSQL algorithms in nosql Databases

Detailed description of distributed algorithms and NoSQL algorithms in nosql Databases Today, we will study some distributed strategies, such as replication in fault detection. These strategies are marked in italics and divided into three parts:

[Translated from mos] mosrfs

[Translated from mos] mosrfs Trace the RFS process in physical dg Source:How To Trace The Remote File Server (RFS) Process In Physical Standby Database (Document ID 1481125.1) Applicable:Oracle Database-Enterprise Edition-Version 10.1.0.2 to 11.2.0.2

You cannot read the list of previously registered servers on this system. Please register your server again in the "registered servers" window, and then register again in the window

You cannot read the list of previously registered servers on this system. Please register your server again in the "registered servers" window, and then register again in the window Environment: Server System: Database Version: Microsoft SQL Server

Build a MYSQL master-slave replication structure and a mysql master-slave replication Structure

Build a MYSQL master-slave replication structure and a mysql master-slave replication Structure 1. Select two servers as the master and backup databases respectively. 2. log on to the server, Yum install mysql; Yum install mysql-server; 3. Start the

PLSQL automatically disconnects and loses connection.

PLSQL automatically disconnects and loses connection.Problem Background: This is the case. Many developers work 8 hours on plsql. Sometimes, after they go out to smoke or finish lunch, they will return an error and report no response when they come

How to convert Access to SQL database, and convert access to SQL database

How to convert Access to SQL database, and convert access to SQL database First of all, I am talking about the conversion between ACCESS2000 and SQL2000, and I have not tried any other products yet. I hope you can experiment more and there is

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