Oracle

Transfer from http://www.cnblogs.com/advocate/archive/2010/08/20/1804066.htmlDeepen your understandingThe database is a photographic film.Example is photo paperA film can be used to punch multiple photographic papers, but a photo paper is a maximum

Oracle's Table connection supports standard notation, but there are also Oracle's special wording, which are different in some scenarios, and are recommended for standard notation, which is just an introduction to the standard syntax for table joins

The NVL function is a null-value conversion function that is primarily used in SQL queries to handle null values. You can use NVL () to remove null values from a calculation or operation in cases where null values are not supported or if NULL values

Get IP AddressIpconfigI. System ServicesStart service: net start ORACLESERVICEORCLMonitoring: Lsnrctl StartClose: Net stop>ORACLESERVICEORCL: Database service (DB instance, SID), which is the core service of Oracle, is the foundation of database

The recent project requires Python to call Oracle for read and write operations, stepping on a lot of pits, and finally realizing it through hard work. Performance how to say first, there are ways to tune the back. Now record the code and attention

This article mainly describes how to migrate data files in the file system form of an Oracle tablespace to an LV bare device. Pre-conditions1. Oracle is operating normally.2. The LV file has been programmed with the LVM command. such as/dev/vgoracle/

Here are some summary of Oracle's daily management operations at work, all of which are basic Oracle operations and SQL statement writing, which are combed into manuals, hoping to help beginners (if there is a sort of inaccuracy, wish to point

--Execution in---sqlplus (awr time period)@?/Rdbms/Admin/Awrrpt.sql-----Generate snapshots manuallyexecDbms_workload_repository.create_snapshot ();--statement Three executions, grouped into snapshots--Querying SnapshotsSelect *

Background_dump_dest displays and sets the location of the Oracle database-related logs and is no longer configurable after oracle11g, but its value can still display the location of the relevant logs, corresponding configuration parameters are

sequence : Is an object provided by Oracle that produces a unique numeric value, primarily for use with a single primary key of a table.To Create a sequence :Create sequence seq_name//namingStart with 1//initial valueIncrement by 1//increment

SELECTUser_tab_cols. table_name astable name, Utc.comments astable Chinese name, User_tab_cols. column_id ascolumn ordinal, User_tab_cols. column_name ascolumn name, User_tab_cols. Data_type asdata type, User_tab_cols. Data_length aslength, User_tab_

--The user of the operation needs to have the following permissionsGRANTCONNECT, RESOURCE toCMIGDW;GRANT EXECUTE onDbms_redefinition toCMIGDW;GRANT ALTER any TABLE toCMIGDW;GRANT DROP any TABLE toCMIGDW;GRANTLOCK any TABLE toCMIGDW;GRANT

1.pl/sql Basic StatementDECLAREBEGINEND;/Looping statementsDECLAREI Number (2): = 1;BEGINWhile iLOOPi:=i+1;END LOOP;END;/DECLAREI Number (2): = 1;BEGINLOOPEXIT when ii:=i+1;END LOOP;END;/Judgment statementDECLAREI Number (2): = 1;BEGINIF I>2 Then....

External Table OverviewExternal tables can only be used after Oracle 9i. Simply put, an external table refers to a table that does not exist in the database. By providing Oracle with metadata that describes the external table, we can treat an

--Create TableCreate TableDEPT2 (DEPTNO Number(2) not NULL, DnameVARCHAR2( -), LOCVARCHAR2( -));Alter TableDEPT2Add constraintDept_pkPrimary Key(DEPTNO); ------Demo.ctlLOADDatainfile*---* indicates that the data is in the control file into TABLEDEPT2

Oracle's Dataguard environment has two types of physical standby and logical standby.Physical standby is transmitted redo to the standby end, and then by the standby side of the MRP process to apply the redo to achieve the same time effect.LOGICAL

A simple way to confirm the state of physical standby:ODM TEST Case===================Name = Tc#1010_3####primary####Sql> Set Line 200Col name for A100sql>Sql> select Instance_name,status from V$instance;instance_name STATUS--------------------------

Meaning explanation:Decode (condition, value 1, return value 1, value 2, return value 2,... Value N, return value N, default value)The function has the following meanings:IF condition = value 1 ThenRETURN (translation value 1)elsif condition = value

1. IntroductionFn is a event-driven, open source, functions-as-a-service compute platform that can run anywhere. Some of it ' s key features: Write once Any language AWS LAMBDA Format supported Run Anywhere

[Oracle][onlineredo] The corresponding policy when the database fails to start: 1. Start with mount.   sql> conn/as sysdba   sql> startup Mount  2. Check the redo log in which v $ log failed.   sql> SELECT * from v $ log;    ===> If