mlm database

Oracle442 application scenarios ---------- database instances and access Database Application Instances The Application Scenario 1-7 is the installation process of Oracle. Here, I will explain a lot about it. There are a lot of materials on the Internet and it may be added later. Application Scenario 8View the location of all data files:Select name from v $ DATAFILE;List command:LISTSAVE command:Save d: \ O

Label:First, the database nameWhat is a database name?The database name is the identity of a database, just like a person's ID number. He used parameters Db_name says that if a machine is loaded with multiple databases, every database has a

When restoring a database, you encounter the following error solution: System.Data.SqlClient.SqlError: Cannot obtain exclusive access to a database because the database is in use. (MICROSOFT.SQLSERVER.SMO) 1. A more direct restart of the SQL Server service, this scenario is suitable for the general personal computer, or computer only this important

Tags: 38714 38760 38706Learning Oracle last night with HR users: CREATE TABLE reg_copy as select * from regions; There is no response to a blank, do not want to forcibly quit, and then use the Oracle user to terminate the session of the way to deal with, successively used three ways:The first type: Select sid,serial# from v$session where username= ' HR ';Then use:ALTER SYSTEM KILL SESSION ' sid,serial# ' IMMEDIATE.Second type:ALTER SYSTEM DISCONNECT SESSION ' sid,serial# ' IMMEDIATEThird: Use th

[Test] database system principle (II)-detailed explanation (database design and ER Model), database system principle er Everything has a lifecycle. Of course, the database system is no exception! The database design and ER model chapter mainly explains the design stages base

Database restoration error: "unable to obtain exclusive access to the database because the database is in use" SOLUTION When you restore a database, you may be prompted that you cannot obtain the exclusive access to the database because the

One database every Day ----- day 2 create and manage database tables, ----- Day Database One database every Day ----- Day 2 create and manage database tables ---- Reprinted with the source: coder-pig This section introduces: This section describes how to create and manage t

[Oracle] Data Guard series (4)-creating a physical standby database without stopping the master database needs to create a physical standby database of DG for a 24x7 production database, the master database must not be shut down. At first, it was impossible. Later, I checked

PHP inserts a random code into the database based on the ID, and then judges that if the random code already exists in the database, it is randomly inserted into the database. PHP inserts a random code into the database based on the ID, and then judges that if the random code already exists in the

Implementation principle of DB database horizontal segmentation-Database Sharding, table sharding, master/slave, cluster, and server load balancer bitsCN.com Chapter 2 Introduction With the popularization of Internet applications, the storage and access of massive data has become the bottleneck of system design. For a large Internet application, billions of PVS per day will undoubtedly cause a considerable

Label:Understanding database backups and transaction log backups Database backup and log backup are the daily tasks of database maintenance, and the purpose of backup is to restore the loss to the lowest point based on the backup database and transaction log files when the database