Oracle

Term-Readline-GNU:Http://search.cpan.org/dist/Term-ReadLine-Gnu/ Io-TTY:Http://search.cpan.org/dist/IO-Tty/ Uniread:Http://sourceforge.net/projects/uniread/ Run tar-xzvf... with the root account to decompress the files, enter the corresponding

Recently, the process was quite busy, day and night, and I had no time to write a blog. Today, a very strange problem, especially a tough problem, has struggled for a long time and I have to write a blog. Select * From wlbtest3where (sname, SAGE)

Oracle automatic backup method:   @ Echo offSetlocalSet SID =? // Modify the SID value based on the actual situationSet username =? // Assign values based on actual conditionsSet Password =? // Assign values based on actual conditionsSet bakdir =?

1. A large number of redo records are generated for the insert operation of the Permanent Table, but almost no redo is generated for the temporary table. This makes sense. insert on a temporary table will only generate a small amount of Undo data,

Before Oracle 10 Gb, we ignored the order by clause by using the implicit sorting required in some special SQL statements, so we should be careful in 10 Gb. For example, in earlier versions, when distinct, union, and group by were used, Oracle had

The database often processes records of parent-child relationships. In Oracle, you can use a query statement to retrieve all the sub-records at a time. For example:T1T11T111T1111T12T121T1211 The DB data fields are as follows:Task_id task_name T.

Select * fromWhere ID in (select ID from B) The preceding query uses the in statement. In () is executed only once. It finds all Id fields in Table B and caches them. then, check whether the IDs of Table A are equal to those of Table B. If they are

Start the Oracle listener. Command: LSNRCTL start Start an instance: First, go to the sqlplus environment and run the following command: sqlplus/nolog. Log on as an administrator. Command: connect/As sysdba Start the instance with the command:

Oracle Delete serialization: Drop sequence seq_itv_collection; Create serialization in Oracle: Create sequence seq_itv_collectionIncrement by 1 --Add a fewStart with 1399 -- count from 1Nomaxvalue -- do not set the maximum valueNocycle --Always

1,StartDatabase: Oracle @ Suse92: ~> Sqlplus/nolog SQL * Plus: Release 9.2.0.4.0-production on Fri Jan 20 02:29:37 2006 copyright (c) 1982,200 2, Oracle Corporation. All Rights Reserved. SQL> connect/As sysdbaconnected to an idle instance. SQL>

8. Use the decode function to reduce processing timeYou can use the decode function to avoid repeated scan of the same record or join the same table.For example:Select count (*), sum (SAL) from EMP where dept_no = 0020 and ename like 'Smith %

To install Oracle 11g in Ubuntu 10.04, follow these steps:1. Install JDK. For the installation method, see setting up a Sun Java Development Environment under Ubuntu 10.04.To solve Chinese garbled characters, create the "fallback" directory in the

After I upgrade a 9206 to 1020, I cannot connect to the client using the OEM, but sqlplus can be used to connect. Why? The error message is: You must have select any dictionary permission to run this application. Ask the DBA to grant this permission

Blocking often occurs in Oracle. In this case, we need to quickly find out the cause of blocking and eliminate it as soon as possible so that the system can run normally again. The following uses a deadlock as an example to find out how to locate

Today I went to the Development Forum and turned around. I saw a post where everyone was discussing multiplication enthusiastically. Remember that when I learned C ++, the most basic question was to output a penalty phrase on the screen. It was

Today, I saw low hwm in my learning process. I was impressed by what I saw before, but I couldn't remember it. I went to Baidu for half a day and didn't find the relevant information. In desperation, I google it and found a post on asktom. Here is

SQL> conn system/OracleConnected.SQL> Create Table Scott. T1 (ID number primary key, name varchar2 (10); -- create a test table Table created. SQL> select constraint_name, table_name, constraint_type, -- view the status of the corresponding

Rollup is an extension of the Group by clause. It can return subtotal records for each group and total records for all groups. Cube is an extension of the Group by clause. It returns the subtotal record of each column combination and adds a total

If you cannot use a function in DBA, you can use sys. Public Virtual User: Permission 1 and permission 2 are available to the public in the test environment, but copying the entire environment to the real environment means that the program cannot

When analyzing application performance problems, we need to pay more attention to the execution of SQL statements, because the performance bottleneck of applications is usually on the database side, therefore, Database SQL statements are the focus