Oracle

Learn from:http://blog.csdn.net/condywl/article/details/571296961. Modify the configuration file under root user/etc/oratabvim/etc/oratab Content: # This file isUsed by ORACLE utilities. It iscreated by root.sh# and updated by either Database

Reprinted from: http://blog.csdn.net/leshami/article/details/5611738First, the conceptTablespace: is a logical collection of one or more data files table space logical storage objects: Permanent segments--such as table and index

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An Oracle database server includes:1. A physical database that stores Oracle data, which is a series of physical files that hold Oracle database data, including control files, data files, log files, and other files.2. Oracle instance: This is a

(1) Oracle Extract () function introduced from Oracle 9i to intercept a specific part from a date or interval type, syntax: Extract ({year | month | day | hour | minute | seco nd} | {timezone_hour | timezone_minute} | {timezone_region |

If at this point after the click of the setup has been a long time or not pop-up in the content, then you need to delete the database of the entire file, and then re-unzipNeed to be aware of legal risks1.DBMS Excel software similar to office, which

For exampleThere is such a table xatxday_flight (Flight schedule),There is such a field std_local (departure time),Requirements: Count every 10 minutes within 24 hours of the day, and several planes take off within 10 minutes.For example:

Yesterday in the QQ group to discuss a SQL optimization problem, the statement roughly as follows:Select A,min (B) from table group by A;--a,b does not have a NOT NULL constraint, column A has no null value, and column B has a null value.-There is a

The ultimate goal of SQL optimization in Oracle database is to shorten the execution time of the target SQL statement. To achieve this, we usually have the following three ways to choose:1, reduce the resource consumption of the target SQL statement.

Today after modifying the database parameters, shut down the database and CRS, and then restart the server, after the server started, the discovery database can not start, the process is as follows:Step1: Restarting the database Su--su-/grid/11.2.

1. See if the listener is startedOpen cmd window, cmd run with administrator, otherwise cannot execute start and stop listening commandLsnrctl Status View run statusLsnrctl Stop to stop monitoringLsnrctl Start MonitoringExecute Stop listening

Reference Blog: http://blog.itpub.net/26015009/viewspace-717505/Here's one way to do this: Use the ORAPWD.EXE tool to change the password.Open a Command Prompt window and enter the following command:Orapwd

Quick statement sharing for joint modification of multiple tables in oracle, oracle statement Merge into user_member_info USING (select min (UP. created) as cre, min (up. shop_no) as shop_no, up. memberid as memberid From user_platform_relation

Cascaded Redo Transport Destinations: An Example of cascade Redo transfer, cascadedredo The following describes some other restrictions in earlier versions based on oracle 11.2.0.2. Cascaded redo transport transfers redo data only from other

ORACLE locks (oraclelockmode) instance details, ORACLE locks have the following modes: 0: none 1: null 2: Row-S Row sharing (RS): Shared table lock, sub share 3: Row-X exclusive (RX): used for Row modification, sub exclusive 4: Share share lock (S):

Oracle11g dos login tutorial, oracle11gdos Login 1. After oracle is installed, oracle services will be available on the computer. Right-click my computer and double-click the service item in the lower-left corner of the window. An oracle service

Several usage methods of oracle decode function, oracledecode Decode usage 1: Use decode to determine whether the string is the same DECODE (value, if1, then1, if2, then2, if3, then3,..., else) Meaning: IF condition = value 1 THEN RETURN (value

Solution for oracle redo log file hard disk failure, oracle Log File Solution to oracle redo log file hard disk failure Rman target/list backup; list backup summary; delete logs in the database data folder, for example, sqlplus/as sysdbaalter

Oracle Study Notes-NVL () function usage skills, learning notes-nvl 1. Rules for alias columns: special characters (except # $), numbers, and spaces must be added with double quotation marks; Chinese characters can be added with double quotation

Detailed description of oracle user creation and permission settings, and detailed description of oracle Permission: Create session Create table Unlimited tablespace Connect Resource Dba Example: # Sqlplus/nolog SQL> conn/as sysdba; SQL> create