Oracle

Oracle SQL developerIs a Java-based tool that provides a graphical interface to a database.While it's main focus is Oracle (of course), it can be hooked up,JDBC, to export other databases, such as MySQL, PostgreSQL, and SQLServer. It's similar to

  First, check the name and file of the tablespace. Select tablespace_name, file_id, file_name,Round (Bytes/(1024*1024), 0) total_spaceFrom dba_data_filesOrder by tablespace_name; 1. Add data filesAlter tablespace ultimusdbAdd datafile

1:Dba_tables displays information about all tables in the database.All index information of the dba_indexs DatabaseDba_tab_columns displays the column information of the database table.Dba_ind_columns displays the index column informationDba_objects

I. View and set Oracle character sets1: view the current character set parameter settings of the Database ServerSelect * from V $ nls_parameters;Or select * From nls_database_parametersOr select userenv ('language') from dual;Query

If you encounter a requirement in the project, you need to merge multiple rows into one row. The table structure is as follows: Name null type -------------------------------------- N_sec_code not null char (6) C_researcher_code not null varchar2 (20

Exp local export and IMP local import Exp command:1 exp username/psw @ test file = D: test. dmp full = y2 exp username/psw @ test file = D: test. dmp owner = (ly)3 exp username/psw @ test file = D: test. dmp tables = (grid1, grid2)1. One of them is

Http://tech.ccidnet.com/art/294/20030526/47427_1.html Asynchronous calling of Oracle stored proceduresAuthor: Wang Hui published at: 2003.05.26 1. About the author Wang Hui has been a teacher, database administrator, primary programmer, and project

Tree Structure and Its dedicated function sys_connect_by_path are simple tree structures. Common applications of trees After learning this function, I used the orgindustries table for a test: Normal Tree Structure Select lpad ('', 6 * (level-1) |

In the past few days, if I access the sqlserver database and Oracle database through the desktop program and Asp.net on the Linux platform, I find that many articles written on the Internet are incomplete and many are useless redundant settings, I

ORACLE: SQL plus has the ability to automatically submit jobs without requiring you to explicitly tell it what to do. It can be achieved through set autocommit on. Off is the default value, which is recommended in almost all programs. Before

Today, we need to collect statistics on the updates of the three website columns. The three websites use different database management systems at the backend. The initial idea is to create a small Tomcat webapp to access the three backend databases

A dual table is an existing table in Oracle and can be read by any user. It is often used in select statements without a target table.   The dual table is created by Oracle along with the data dictionary. All users can access the table with the

Oracle defines PL/SQL Variables   Preface:You can use a variable to save the data to be processed by the computer. To allocate proper memory space to the variable, you also need to specify the data type. For some data types, you also need

  Oracle does not automatically add primary keys. This is different from SQL Server. in Oracle, sequence and trigger must be used to increase the primary keys. 1. Create a data table Create Table test_increase (userid number (10) primary key,/*

How to thoroughly uninstall oracle?   Post with: http://www.diybl.com/course/7_databases/database_other/20090207/154900.html   Common Oracle Database colleagues know that Oracle often encounters some inexplicable errors, resulting in the database

Common Oracle database field types are as follows: Field Type Description Restrictions Other Instructions Char Fixed-length string Maximum length: 2000 bytes Varchar2 Variable-length string Maximum

On: http://www.linuxwind.org/html/oracle-10g-em-startup-repair.html 1. Fixed the change of host name. Em cannot be started after IP Address Prerequisites: Oracle has been started and the listener is running. CD $ ORACLE_HOME/Network/admin/ Edit

Configuration when a listener error occurs: |-Error 1: Oracle Database listening services often encounter errors. The Registry is deleted when the optimization software is used. Registration items of the listener service: HKEY_LOCAL_MACHINE \ SYSTEM

Use Oracle External tables to query analysis warning logs Oracle The warning logs in are recorded in the chronological order. Oracle Internal errors in the database, so that you can use this warning log to remind you that you can query the warning

AnalysisOracle Data Scanning --Oracle SQL query optimization (1) Data Reading Method 1,Oracle Data Reading: 1.1 data read operation type: In any database, when we initiate an SQL statement to query data, the SQL Execution engine scans data to return