Oracle

Log in to the database you need to back up using PL/SQL developer; Select Tools, export user objects; Select the object in the object list that needs to be backed up, then select an output file of SQL type, click "Export", this is just the

2016-08-11 Chen Long-mo College Explore Oracle High water level impact on database performance1Hello everyone! I am a chen long from the cloud and Emme, and I am currently primarily responsible for Oracle technical support work. When I began to

Oracle Full Uninstall under Windows:You can unload a database using Oui, but there will still be some residue in the registry and file system after uninstallation. These residues not only occupy disk space, but also affectoracle.   To uninstall

A function was created in Oracle that originally wanted to return an index table without success. Think of text can also transfer information, suddenly came to the inspiration, the return value to set the text format.Given that the amount of return

0. Resource Preparation1) Plsql Developer installation package (cannot be uploaded because the installation package is more than 10M, please download it yourself)2) Instantclient_11_2 installation package (cannot be uploaded due to installation

I doctor became too big to forget the Oracle SYS user and system user password, and after several attempts to log on to system, the system is locked.After some attempt, finally solved. The process is as follows:First, rebuild the sys password file.

Oracle Role Management　First, what is the roleRole: A role is a set of permissions that assigns a role to a user who has all the permissions in the role.Second, the system pre-defined role 　　Predefined roles are some of the most commonly used roles

ORACLE11G (My network disk): Https://yunpan.cn/QTW8LaB3IkTxD access Password a633Oracle 11g Installation1. Unzip the downloaded package, then enter the package and click setup.exe to start the installation. 2. Appear as follows: Generally, the small

Oracle Basic data types (also called built-in data types built-in datatypes) can be categorized by type: String type, Number type, date type, LOB type, LONG raw& RAW type, ROWID & urowid type.Before Apple told the string type, let's talk about

Oracle SQL Developer is a very powerful open source SQL development tool, but recently I began to study it, just installed Oracle SQL Developer is not supported to connect MySQL, need to download the JDBC driver formysql from the MySQL official

First, sqlplus query results, can be adjusted according to their own screen conditions, set the following:1. Set the number of rows to display on a pageShow pagesize; First look at the current pagesize, the default is 14Set pagesize 100; Set

Use the HAVING clause to select rowsThe HAVING clause sets conditions on the GROUP by clause in a manner similar to how the WHERE clause interacts with the SELECT statement. The WHERE clause search condition is applied before the grouping operation,

One, no return value of the stored procedureAncient cloud: Make haste, in order to let the big guy easier to accept the paging process to write, I still from simple to complex, gradually to everyone to explain. The first is to master the simplest

We often encounter situations that require table duplication, such as copying part of a table1 data into table2, or copying the entire table1 to table2, when we are going to use SELECT into and the INSERT into SELECT table copies the statement.

How do I delete a user in Oracle?Using drop user in Oracle to remove users, the user's objects are also deleted if you use the drop user cascade. To achieve the effect of deleting a user without affecting the use of objects under the user, you can

One, multi-table joint querySecond, sub-queryThree, dynamic condition queryLESSON 4 Displaying Data from multiple Tables--------------------------------------------------------Query the maximum number of wages in the S_emp table, and show the

Common analytic functions:1. First,last--Suppose A: = min (bonus) Keep (Dense_rank First Order by salary)--Assuming that the minimum wage is 1000,a for employees who are equal to 1000 of the wage, take the minimum bonus--Suppose B: = min (bonus)

The SGA contains components: Component Name Description Parameters Buffer cache Storing copies of data read from a data file that can be shared among all users Db_cache_sizedb_keep_cache_sizedb_recycle_

 Reproduced1. For ' 1 ', ' 2 ', ' 3 ', ' 4 ', ' 5 ' (comma outside the string) sql> SELECT column_value from TABLE (SYS.  Odcivarchar2list (' 1 ',' 2 ',' 3 ',' 4 ',' 5 ')); Column_value -----------------------------------------

Routine maintenance and troubleshooting of Oracle 11G R2 slave uard 1. for the Forced Logging mode, there are some DDL statements that can avoid writing redo logs by specifying the NOLOGGING clause (the purpose is to increase the speed, which is