Oracle

Pen QuestionsWith the relationship emp (ENO,ENAME,SALARY,DNO) The meanings of each of these attributes are employee number, name, salary, department number, and Relationship dept (Dno,dname,manager) which are in order department number, department

basic syntax for Oracle stored proceduresCreate or Replace procedureProc1 (P_para1varchar2, P_para2 outvarchar2, P_para3inchOutvarchar2 ) asV_namevarchar2( -); beginV_name:= 'Zhang Sanfeng'; P_PARA3:=V_name; Dbms_output.put_line

If you mistakenly delete the data file test.dbf of test in a tablespace, and then the next time you restart the database, the database cannot be opened (open) .always error: sql> ALTER DATABASE open;ALTER DATABASE open*ERROR at line

First, under the Windows system, please click "Start", then click "Run", enter cmd and click "OK" to open the Command line windowEnter the following command:Sqlplus/nologAfter the carriage return, a prompt sql> appearsThis inputConn/as

Package left file:is varchar2varchar2); End S02_zfrzpt_ys_mid; Package right File:CreateOrReplace package body S02_zfrzpt_ys_midIsProcedure Start_cal (strgranularityInchVarchar2,--1st, 2,3,4: month; 5: quarter; 6: Half year; 7: Year

Oracle uses redo log files to record operations on the database, but redo log filegroups are recycled, when all log files are filled, the system automatically switches to the first set of log files, and of course the database administratorYou can

2, the database connectionUsing Sqlpluse to connect to the database, the tnsping Test command detects whether the database test can be connected2.1, the database in the local1 sqlplus userName/password@orcl--ORCL for Oracle database SID2 Sqlplus

Oracle Data monitoring hangs The restart method:--Monitoringlsnrctl Start-- A slight delay after startup to take effectLsnrctl statusLsnrctl stop--strong kill MonitorPs-ef|grep LsnrctlPs-ef|grep tnslsnr|grep-v "grep"kill-9 the number in frontOracle

Lab Environment: Linux6.4 + Oracle 11gFor readers: Oracle Development and maintenance personnelThis article presents a demo from a Scott user with Oracle:First logical backup exports Scott's object data $ exp Scott/tiger file= '/u01/app/backup/

1. Download Rlwrapwget http://utopia.knoware.nl/~hlub/uck/rlwrap/rlwrap-0.42.tar.gz2. UnzipTar-xvzf rlwrap-0.42.Tar. GZ3. Check the configuration CD/opt/rlwrap-0.42[email protected] rlwrap-0.42]# ./configureconfigure:checking forPty

Oracle Delete log filesThe syntax for deleting a log file is as follows:ALTER DATABASE drop logfile member logfile_name;There are several points to note when deleting log files:1. The log file group where the log file resides cannot be in the

2000 byte in Oracle, not 2000 characters, 1 characters in Oracle may be 1 byte to 4 byte, depending on the setting of the database character set.For the GBK character set, 128 characters in the ASCII code are stored using 1 bytes, the other

In Oracle's package, there is a package named Dbms_job, which functions to arrange and manage the job queue. The job queue allows the Oracle database to perform specific tasks on a regular basis. When using Dbms_job to manage jobs, you must make

In a Linux system, after the Oracle database service is installed, the Oracle service will start automatically at any time by default, as is the case with Windows systems. Linux system, it is necessary for users to manually set up, in order to

ORA-01733: virtualcolumnnotallowedhere.Base table: hr. tt scott. ttView 1: Based on hr. tt union all scott. tt --- scott. tttView 2: Create system. tt Based on View 1-scott. tttProblem reproduction: SQL> create table hr.tt (a number);Table

Add notnull constraints to oracleWhen creating a table, add the not null constraint to the column in the following format:Column_name data_type[Constraint constraint_name] not nullConstraint constraint_name indicates the name specified for the

Oracle uses time (minute) computing to calculate the number of days, hours, and minutes, and oracle hours. The example in this article describes how Oracle uses time (minute) computing to calculate the number of days, hours, and minutes. Share it

Create a log file in oracle The syntax for creating a log file is as follows: Alter database database_name add logfile [group group_number](File_name [, file_name [,...]) [SIZE number] [reuse]; The syntax is described as follows; Group group_number

[Dan JIU Jian] Oracle knowledge point sorting (6) Procedure, function, Sequence, and oracleprocedure of common database objectsLink navigation for this series: [Lone sword] Oracle knowledge point sorting (1) Table space and users [Gu JIU Jian]

Solution to EnvironmentvariableORACLE_UNQNAMEnotdefined error reported by CentOSOracle After installing Oracle on CentOS today, the "Environment variable ORACLE_UNQNAME not defined" error is reported when the "emctl start dbconsole" command is run