Oracle

1.1 Simplest query statementExample 1-1Sql> select * from EMP;Example 1-1 resultsThe * number here indicates the entire column. It is the same as listing all the column names after select. Query statement with a semicolon (;) End.An EMP (employee)

Precautions : Must be logged in as Administrator; Sequence_owner must be uppercase, regardless of whether your user name is uppercase or not. Only uppercase can be recognized. --查看当前用户的所有序列 select SEQUENCE_OWNER,SEQUENCE_NAME

1) V$lockGiven the lock information, such as the Type field, the user type locks has 3 kinds: tm,tx,ul,system Type locks There are many, common are: Mr,rt,xr,ts and so on. We only care about TM,TX locks.When TM locks, the Id1 field represents object_

1. In idea, the JSTL library is imported into web-inf/lib and can be directly on the JSP page via thetaglib uri= "http://java.sun.com/jsp/jstl/core" prefix= "c"% >taglib uri= "http://java.sun.com/jsp/jstl/sql" prefix= "sql"% >Import, you do not

1. Create a backup path under the root user:mkdir /opt/backupchown oralce:oinstall /opt/backup2. Oracle user creates backup script path:mkdir /opt/app/oracle/bincd /opt/app/oracle/bin3. Create a backup scriptvi backup.sh#!/bin/shexport

System version:Oracle Linux Server Release 5.7Database version:Oracle Database 11g Enterprise Edition Release 11.2.0.3.0-64bit ProductionPL/SQL Release 11.2.0.3.0-productionCORE 11.2.0.3.0 ProductionTNS for Linux:version 11.2.0.3.0-productionNlsrtl

I. Definition of stored proceduresStored Procedures (Stored Procedure) are in a large database system, a set of SQL statements to complete a specific function, stored in the database, after the first compilation after the call does not need to

1. Turn off the firewall and disable SELinuxVi/etc/selinux/config Modify selinux=disabled, and then reboot if you do not want to restart using command Setenforce 02. Installing dependent Packages# RPM-IVH libstdc++-devel-4.4.7-4.el6.x86_64.rpm#

1.1. Rman Connection DatabaseRman can connect to a target database through operating system authentication and password file two ways, users who use the Rman Backup Recovery tool need to have SYSDBA or sysbackup system permissions, if the user needs

Problem reason: No domain name server configuration, directly modify the hosts, resulting in the Oracle server host name can not be resolved, this is 11.2.0.1 small bugWorkaround: Copy the domain name mapping from the Oracle server hosts to the

Oracle RAC disk expansion Mining pit record:System environment: VMware ESXi Oracle RAC 11.2.0.4Yesterday, I expanded the ASM Disk group, the FRA disk group, and the data disk group, and I added a piece of hard disk 320g,200g to the data group, and 12

Oracle stored procedures, declaring variables, for loops1. Create a stored procedureCreate or Replace procedure test (var_name_1 in type,var_name_2 out type) as--Declaring variables (variable name variable type)Begin--The execution body of the

Use schedule to manage Scheduling in oracle scheduling, oracleschedule Before you begin, you should first say that dbms_job should be disabled for all applications as DBAs. Dbms_scheduler is very complex. oracle has spent many chapters in the two

How to restore the accidental deletion of tables in oracle (drop )?, Oracledrop View tables in the recycle bin Select object_name, original_name, partition_name, type, ts_name, createtime, droptime from recyclebin; Restore table SQL> flashback

Oracle saves and reads images, Oracle image storage and reading tutorials Package com. kevinb. image; import java. io. file; import java. io. fileInputStream; import java. io. fileNotFoundException; import java. io. fileOutputStream; import java.

How to read the clob field of dblink in oracle In oracle, database connections are used. large fields such as CLOB in the source table cannot be displayed in the select statement. For example, if there is a source table tsource with a large field

SQL statement | description of connector usage, SQL statementI. | role | Indicates splicing, such as 'A' | 'B' is equivalent to 'AB'Ii. | example: Generate select statements in batches Select 'select * from' | tname | ';' from tab t where t.

How to change the oracle xe character set to ZHS16GBK, xezhs16gbk After Oracle XE runs the installation program, the simple default value is SIMPLIFIED CHINESE_CHINA.AL32UTF8. You can change it to ZHS16GBK using the following method. The character

Explain how to use oracle sequence instances and explain oracle sequence instancesOracle sequence creation Sequence Create sequence seq_test_1 // create sequence name minvalue 1 // minimum value maxvalue 100000 // maximum value start with 15 //

How can I solve oracle client garbled characters in the dos window ?, Window oracle The garbled characters in my dos window are as follows: Enter the sqlplus command to prompt that the user name and password are garbled, for example: Cause: