Oracle

Oracle uses the Start with... Connect By clause to recursively query ORACLE. It provides an interesting function to connect by clause, which can sort the branches with a family tree structure. It applies to the structure of organizations or

 WINDWOS platform: Go to the installation directory cd % ORACLE_Home %/network/admin of oracle and find a sqlnet. ora file (if not, you can manually create it) to edit the following content: # This file is actually generated by netca. but if MERs

Tips on Oracle optimization: Methods for Improving ORACLE performance (indexing SQL statements as much as possible) SQLOracle script I. question raised at the early stage of application system development, due to the small amount of data in the

Database use: Oracle ORA-01110 error SolutionOn the database server, create a user test and run the drop user test cascade command to delete the user, the user's data file/opt/oracle/oradata/test/testdata is also deleted. dbf. When you log on to the

Oracle exp and imp commands are usually used to import and export ORACLE data. Before expdb and impdb (before 10 Gb), we use exp to export data, imp command. Open the CMD window and implement IMP. EXP is mainly completed by calling IMP. EXE and EXP.

Oracle-Example of modifying the field type: l_amount_temp is a temporary field, and L_AMOUNT is a field to be modified. SQL code alter table alter add l_amount_temp int; www.2cto.com alter table modify L_AMOUNT NULL; update into set l_amount_temp =

Solution for accidental deletion of oracle log files: oracle log files are deleted (mainly for those software such as 360 security guard, QQ computer manager, and Kingsoft guard that use logs as garbage, when using them, be careful, or remove the

1. group function usage rules: Group functions in mysql can be used at will in select statements. However, if a group function exists in the query statement in oracle, other column names must have been processed by group functions, or the column in

Resolving oracle 11g reporting ORA-01034 and ORA-27101 errors the database version I locally installed is ORACLE 11G R2, when connecting with plsql, the following ora-12514 error is reported:However, when using sqlplus in cmd to connect a user

Analysis of PL/SQL stored procedures -- create or replace creation or replacement. If it exists, replace it. If it does not exist, create or replace procedure pis cursor c is select * from dept2 for update; begin for row_record in c loop if

Analysis of oracle tree SQL query: select typecode, lpad ('', 4 * level-1) | typename from ajtype start with p_code is null connect by prior typecode = p_code; Result: 1 + city appearance and sanitation 15 + lighting management 151 + refusal to

RANGE partitions of Oracle table partitions use the range partition syntax for values of one or more columns in the table: [SQL] PARTITION BY RANGE (column_name) (www.2cto.com PARTITION part1 value less than (range1), PARTITION part2 value less than

Oracle LISTENER does not listen to the oracle instance. Solution: LISTENER = (DESCRIPTION_LIST = (DESCRIPTION = (ADDRESS = (PROTOCOL = IPC) (KEY = EXTPROC1521 ))) www.2cto.com (DESCRIPTION = (ADDRESS = (PROTOCOL = TCP) (HOST =

During the past two weeks, I have been busy with the migration of databases. When I did not do it, I felt it was very easy, but I was dumpfounded when I did it. In this tangle, let's talk about the problem:1. Database Table Structure Problem:

Open the oracle installation directory and find the tnsnames file. ora file, usually in the path D: \ oracle \ product \ 10.2.0 \ db_1 \ network \ admin (oracle 10g) oracle11g also creates the following configuration in a directory similar to

ORACLE incomplete backup series uses rman-based Incomplete recovery SQL> select * from test; a ----- 123456sql> hostramn target/rman> run {allocate channel c1 type disk; bakup full tag 'dbful' format 'd: \ backup \ full _ % u _ % s _ % P'

Restore the database environment by using the resetlog recovery control file: rhel 5.5, oracle10.2.0.1xmanager4.0 after backing up the control file, perform a series of operations on the database to close the database; restore the control file,

How to view the permissions of oracle users the types of ORACLE Data Dictionary views are: USER, ALL, and DBA.USER _ *: Information about objects owned by users, that is, information about objects created by users ALL _ *: Information about objects

 Oracle plsql connection options File Name: tnsname. ora # Tnsnames. ora Network Configuration File: E: \ oracle \ product \ 10.1.0 \ Db_1 \ network \ admin \ tnsnames. ora# Generated by Oracle configuration tools.Www.2cto.comDEV =(DESCRIPTION

How to uninstall oracle: 1. Choose "start"> "Settings"> "Control Panel"> "Administrative Tools"> "services" to stop all Oracle services; 2. Start-> Program-> Oracle-OraDb10g_home1> Oracle Installation Products-> Universal Installer uninstalls all