Oracle

Oracle universal installer, Oracle Database, Enterprise Edition. Oracle Database Configuration assistant to create database. Oracle Net configuration assistant to connect the certain (remote/local) database. Oracle Enterprise Manager adds the

Recently encountered a strange Oracle problem:There is a table in the Oracle database. When querying the column of the varchar2 type in the table, normal results are always not found. If you query other types of columns, normal results can be

Key factors affecting Oracle Efficiency Original http://hi.baidu.com/odbcconnection/item/f4a56cbf1c8bea422bebe32f 1: select the most efficient table name sequence (only valid in the rule-based Optimizer) OracleThe parser processes the

Table C Procedure Create Or Replace Procedure P_test_loop_cur (in_test In Varchar2 ) Is /* **************************************** * *********************** Name: [name] * purpose: -- update the data in Table C to

Field name Hr_employee.activity Original Field Type Number (1) New Field Type Varchar2 (10) Modify Scheme /* modify the original field name */ alter table hr_employee rename column activity to activity_temp; /* Add a field with

Oracle considers null to be the largest. Sort in ascending order,By default, the null value is placed behind it. Sort in descending order,By default, the null value is first. There are several ways to change this situation: (1) Use the nvl

Oracle paging query statements can be applied in the format given in this article. Paging statement:Select * from(Select a. *, rownum RnFrom (select * From table_name)Where rownum )Where rn> = 21 [/color] Where the innermost query select * From

/*Stored ProcedureParameter type:In indicates the input parameterOut indicates the output parameter.In out indicates both input and output parameters.The input parameter is used by default.Note: The parameter data type of the stored procedure does

In Oracle, table space is the basic method for data management. All user objects must be stored in the table space, that is, the user has the right to use the space to create user objects. otherwise, you do not need to create objects because you

Oracle 10g server and client installedProgramAnd create a database instance orcl.     Installation: 1. Install ArcSDE 9.2 for Oracle 10g by default. 2. perform post installation. Step 1 select complete for installation. In the dialog box that

The following are some considerations for converting MySQL to Oracle. 1. Automatically increasing data type ProcessingMySQL has a data type that increases automatically. When you insert a record, you do not need to operate on this field. The

In ms SQL Server, I am used to writing SQL statements. I suddenly need to write SQL statements in Oracle. To tell the truth, there is no big difference in principle. However, some functions in Oracle are not used unless I understand them, sometimes

1. Method 1: simple variables; Select ename,(Case deptnoWhen 10 then 'accounting'When 20 then 'Research'When 30 then 'sales'When 40 then 'operation'Else 'unassigned'End) as departmentFrom EMP;Ename Department--------------------Smith ResearchAllen

In Oracle, you can create scheduled tasks like SQL Server. Next I will use oracle SQL to create a scheduled task. 1. Create a simple table. Create Table testdate ( Name varchar2 (20 ), Createdate date ) 2. Create a stored procedure.

  Modify the port 8080 of Oracle Use sys to log on to Oracle and use dbms_xdb to modify port settingsSQL> call dbms_xdb.cfg_update (updatexml (2 dbms_xdb.mongo_get ()3, '/xdbconfig/sysconfig/protocolconfig/httpconfig/HTTP-Port/text ()'(4

A long time ago, when I was still in a state-owned enterprise, I was asked by the leaders to optimize an SQL statement. At that time, I did not know what SQL optimization was at all. However, after Baidu and Google found that all the materials had

Installing oracle in Linux is an annoying thing. It is not as simple as in windows, but windows is really not in the server field. A good DBA is also a Linux master. Today I am tossing Oracle, And I will record the installation process for my

Several files and parameters that need to be modified during Oracle installation: /Etc/security/limits. conf Nproc: Number of processes that can be enabled Nofile: number of files that can be enabled /Etc/PAM. d/login: # Add for install

1. When multiple tables are combined, an error "Character Set mismatch" is returned when the nvarchar2 type is encountered" A: Add to_char (variable or field of nvarchar) to the place where nvarchar is used) 2. When multiple tables are union, the

1. Check the locked table. Select lpad ('', decode (L. xidusn, 0, 3, 0) | L. oracle_username user_name, O. owner, O. object_name, O. object_type, S. sid, S. serial # from V $ locked_object L, dba_objects o, V $ session s where L. object_id = O.