Oracle

CASE statementInOracleRe-runningAssign a value to a specified fieldThe usage is what we will introduce in this article. First we need to create a database and add data. Then we will introduce this usage using two instances. Next we will introduce

Oracle 10gDatabaseUNDO_RETENTIONThe usage of parameters is the main content we will introduce in this article. Next we will start to introduce them. We know that each database requires a method for managing rollback or data revocation. After a DML

We have discussed the contention between char and varchar in MySQL databases before, knowing under what circumstances the Char character type data is used and under what circumstances the Varchar character type data is used. This time VarChar2 was

As shown in, Exalytics is an engineering system consisting of three parts: Memory analysis hardware, memory analysis software, and optimized Oracle Business Intelligence basic suite. Figure 1: Oracle Exalytics is an engineering system composed of

Here is the Oracle copy from a brother. Thank you!Java code1. query constraints in the data dictionary:SELECT constraint_name, constraint_type, search_conditionFROM user_constraints WHERE table_name = 'ployees ';// The table names here are all

1. db_name SQL> show parameter db_name NAME TYPE VALUE----------------------------------------------------------------------------Db_name string aaadb Indicates that the database name is aaadb. 2. instance_name SQL> show parameter instance_name NAME

Through the following Oracle performance tuning method, you should be able to avoid these problems. If you encounter these problems, repeat the Oracle Performance Tuning steps mentioned above, or read appropriate chapters to solve these

You can use exec or call to call a stored procedure.Use var when defining variables, for example, var username varchar2 (20 );When calling a variable, double quotation marks must be added before the variable name, for example, exec: username: =

First, you can use the following statement to view the existing database mode:Select name, log_mode from v $ database;You can also use the following statementArchive log list; (This method requires the as sysdba)SQL> archive log listDatabase log

1. External Connection· Ms SQL SERVER supports two forms of table connection① The form inherited from Sybase:Field 1 * = Field 2 (left join)Field 1 = * Field 2 (Right join)No full outer join syntax in this form② Standard outer join syntaxLeft [outer]

When installing oracle, the following error occurs: ORA-24324: uninitialized effect handleORA-24323: this value is not allowedORA-28547: Connector failure, maybe Oracle Net Control Error Both "Ignore" and "interrupt" will fail to be installed. The

  By default, integrity constraints are checked after the entire statement is processed. However, you can create a latency constraint to delay this constraint to COMMIT or another time before checking. Can be specified · Deferrable initially

Oracle Database CPU/IO Information Collection CPU time collection starts from 10 Gb, oracle introduces a time model, from the perspective of oracle, we can look at the CPU usage. oracle training first describes several concepts: db time: the time

Oracle tablespace (view path, modify, create) 1 view tablespace path select * from dba_data_files;  2. Modify the tablespace size. ALTER TABLESPACE MAXDATA ADD DATAFILE '/oradata/XX/MAXDATA02.DBF' SIZE 1000M;   [SQL] can be viewed through PL/SQL. 1.

Startup mount times ORA-12514 error solution oracle dmp File Import database is, the system reports archive log is full, so think of archive log disable; 1. shutdown immediate; success 2. startup mount; ORA-12514: TNS: The listener currently cannot

Migrate the ORACLE11G test data file to another disk group and log on to the oracle instance to migrate the data file in the users tablespace from the DATA1 disk group to the DATA2 disk group. [Oracle @ IDM ~] $ Sqlplus/as sysdbaSQL * Plus: Release 1

Oracle Q & A (2) Oracle Q & A (1) http://www.bkjia.com/database/201309/242497.html 11. What is the use of nvl functions? NVL (string1, replace_with) function: If string1 is NULL, The NVL function returns the value of replace_with; otherwise, the

Before using the number of bytes for Chinese characters in the ORACLE database, I thought that one Chinese Character occupies two bytes. This is true for MSSQL Server (at least within my understanding. If there is an error, please correct it ). But

In terms of databases, NFS can also be applied. Today we will focus on Oracle Direct NFS. In this article, we have explained in detail the test process and specific configuration methods, and hope to help you. Then, we tested the Oracle Direct NFS

How to resize a virtual machine hard disk (Oracle VM VirtualBox) VBoxManage modifyhd | [-- resize | -- resizebyte ] -- resize can be used to modify the size of an existing hard disk image file, it only affects the logical size of the virtual hard