Database Administrator

Maybe the first time I came into contact with select... into... from... and insert... select... many people may misunderstand that, on the surface, it is not that simple to query relevant information and add it to a table. Next, pig will introduce

Today is. Starting from today, I plan to learn a wait event every day before the Spring Festival. Today I will record the wait event note read by other session. What is read by other session? This wait event occurs when we are trying to access a

When installing Oracle RAC in Linux, It is very troublesome to get asm. To run with the kernel, Oracle Linux is better. It is available on the CD. Unlike other tasks that need to go to the Oracle official website to download asmlib. In addition,

    SQL GROUP BY instance We have the following "Orders" table: O_Id OrderDate OrderPrice Customer 1 2008/12/29 1000 Bush 2 2008/11/23 1600 Carter 3 2008/10/05 700

1. Add FieldsAlter table student add age number (5 );2. Modify FieldsAlter table student modify age number (10 );Alter table table2 rename column result to result2;3. delete a fieldAlter table student drop column age;4. Clear table dataTruncate

I. Terms Data: Data DataBase: DataBase, DB DataBase Management System: DataBase Management System, DBMS Ii. Data Model 1. Data Model Classification The E-R Diagram for an instance is as follows: Suppliers, projects, and parts are in

FROM publishWHERE (id NOT IN(Select top n-1 idFROM publish ))Keywords with id publish tableWhen I saw this article at the time, I was truly inspired by the spirit and thought that the idea was very good. Later, I was working on an office automation

Ms SQL database log Compression MethodMs SQL performance is very good, but the database has been used for a period of time, the database has become very large, the actual amount of data is not large. It is generally caused by database logs! The

For example, you can useUse mydatabaseSelect * from table1 where username like '% c %"The following is another way to complete the above functions:Use mydatabaseSelect * from table1 where charindex ('C', username)> 0In theory, this method has one

Introduction to the extended stored procedure for sending, receiving, and automatically processing emails using SQL Mail SQL SERVER provides an extended storage process for sending and receiving emails through EXCHANGE or OUTLOOK. The following

1. Use the MSSQL Enterprise Manager to open the table structure (design table). locally, use phpmyadmin to create one table based on the structure, optimize the table data fields, and create the table.2. Use the Enterprise Manager to export a single

But what does "last trick" mean? What will happen when you use this command? Which command should you use to replace it? Finally, if this command is so problematic, why does Sybase provide it?Sybase Technical Support recommends that you regularly

Database deletion statements:Delete: Used to Delete rows in a table (Note: You can Delete a row or Delete all rows without deleting the table (that is, the table's structure, attributes, and indexes are complete)Syntax: Delete a row: Delete From

For example, I have some news information, including these fields: News ID, news Name, news ShortIntro, news Detail, news PublishTime. Now I want to store it in the database, and then retrieve it from the database and put it in the GridView for

The reason for putting constraints and indexes together is mainly because of primary key constraints and unique key constraints. They will automatically create a corresponding index. Let's look at the constraints in the database. 1 Constraint In

Speaking of Java operations on databases, we will naturally think of Sun's well-known brand JDBC. For NoSQL databases such as MongoDB, there are currently no standards such as JDBC. This article analyzes the current situation and looks forward to

Follow these steps:1. Check the user's proifle, which is generally default:SQL> SELECT username, PROFILE FROM dba_users;2. view the password validity period settings of the specified profile, such as default:SQL> SELECT * FROM dba_profiles s WHERE s.

1. tar + openssl file encryption: There is a folder named test in the current directory: 1. Use tar to encrypt the file: # Tar-zcvf-pma | openssl des3-Salt-K password | dd of = test. des3 After the installation is complete, a package file named

I. Installation conditions 1. Prerequisites: 1). the source and target Oracle Database listening starts.2). gg installation directory:/u01/app/ogg3) The copied table must have a primary key.4) check whether the extraction log directory configured by

4 SOTA operation 4.1 SOTA character Interface SotaCC is a character interface to manage sota system programs.   Start sotaCC in the/.../sota/bin/directory. Enter the command "./sotaCC" in the directory of the terminal to start the character