Oracle

Oracle Temporary tablespace group a Temporary tablespace group contains at least one Temporary tablespace. The temporary tablespace group cannot be created explicitly. It is automatically created when the first temporary tablespace is assigned to

To update data of two tables in oracle, you must update the corresponding data of only two tables. Note that table 1 and table 2 have the same structure as id and name. Problem: When the id of table1 is the same as the id of table2, the name of

Routine knowledge of Oracle Database Maintenance-1. check the idle tablespace of the database. The CHUNKS column indicates the number of available idle blocks in the tablespace (each idle block is composed of several consecutive Oracle data blocks).

Dark Horse programmer _ learn Oracle Summary input ed command to generate notepad, use the backslash (/) to execute the statement in the file to set the column width set lines 500; or set line 500; set the command line WINDOW> default value> layout

Oracle database tablespace capacity adjustment (tablespace contraction script) script -- 1. Obtain the tablespace information to be released (including the tablespace owned by oracle database) -- drop table system. tbs_detail; create table system.

When SQOOP interacts with ORACLE, the user name and table name must be of the same size. Otherwise, no results will be displayed. As follows: [hadoop @ htbbs bin] $. /sqoop list-tables -- connect "jdbc: oracle: thin: @ htbbs: 1521: htdb" -- username

When Oracle is connected to sqlplus again, it is easy to forget the solution time, or write it down. When SQLPLUS is connected to ORACLE, Chinese characters are displayed as question marks and character sets are reset. Because it is not a machine of

All about oracle smallfile and bigfile tablespace Oracle Tablespace tablespace is the highest level of the logical structure, and others correspond to segment object segment, partition extent, and block respectively. The Oracle database on the

Oracle Study Notes (5) Example: a complete database script-copy from here and save it as xxx. SQL -- first delete all constraints alter table xxx drop constraint .... -- delete sequence drop sequence xxx -- delete view drop view xxx drop view aaa ...

Basic knowledge of SQL in Oracle mode SQL code -- create table and data for testing create table t603 (code varchar2 (10), year varchar2 (10), month varchar2 (10 ), p_id varchar2 (7), v1 number (10), v2 number (10); comment on column t603.code is

In linux, the first step of orcale basic operation commands is to log on to the Data Server: enter the account ssh 192.168.111.111-l oracle enter the password ********** ----------------------------- Step 2 log on to the database account sqlplus

Oracle 10g backup and recovery Oracle 10g backup and recovery can be divided into three levels: database level (for the specified database), Mode Level (for the specified user) and the record table level (for a specified table ). 1. the command line

[Oracle] Data Guard-three Protection modes Data Guard provides the following three Data Protection modes: 1) Maximum Protection) the "maximum protection" here refers to protecting data from loss to the maximum extent, that is, at least one standby

Oracle helpless Char and Varchar Abstract: Orcale helpless Char and Varchar are working on a project recently. I don't know why it is necessary to align the data, at the beginning, all the characters in the database were defined as Char Types, which

Basic PL/SQL Syntax: raise the salary for persons of different identities/* raise the salary for employees: President 1000 manager 800 other 400 \ the SQL statement that may be used is update emp e. sal = e. sal ++ ??? Where e. empno = empno;

How to set The space warning threshold value of lmt the following example sets the free-space-remaining thresholds in The USERS tablespace to 10 MB (warning) and 2 MB (critical ), and disables the percent-full thresholds. set user tbs to-warning

Summary of Oracle Database optimization I personally understand that the most critical factor in database performance is I/O, because the operation memory is fast, but the read/write speed is slow, the most critical problem in database optimization

Solution to Oracle "record locked by another user" failure to update and delete: 1. view the database lock and the source and type of the diagnostic lock: select object_id, session_id, locked_mode from v $ locked_object; or run the following command:

Sqlplus displays SQL Execution plans and statistical information 31, 32, 33, 34 keywords: oracle storage structure the most detailed explanation: 1: doc 1 logical storage structure 2: doc 2 physical storage structure how to open oracle sqlplus trace:

When the GLOBAL_NAMES parameter is set to TRUE, the Database Link name must be consistent with the GLOBAL_NAME parameter of the connected DATABASE. In the test, the database link created is XJ (WINDOWS 2003 ORACLE 10g 10.2.0.1), and the connected