Oracle

 View Tablespace usageSelect Upper (F.tablespace_name) "Table space name",D.TOT_GROOTTE_MB "Table space Size (m)",D.tot_grootte_mb-f.total_bytes "used Space (m)",To_char (Round (d.tot_grootte_mb-f.total_bytes)/d.tot_grootte_mb * 100,2),' 990.99 ')

Look at the SQL statement first: Merge into employee E using Emps em on (e.emp_id=em.emp_id)When matched then update set E.emp_name=em.emp_nameWhen isn't matched then insert values (em.emp_id,em.emp_name)1. Update the data in the Emps table to the

2016-02-16Relationship Division R÷sRelationship mode R (x, y) S (y,z)Meaning: Querying tuples in R that are related to all tuples in sFirst, create the base table R and SCREATE TABLER (XVARCHAR2(Ten), YVARCHAR2(Ten));CREATE TABLES (YVARCHAR2(Ten),

Original Url;http://www.oschina.net/question/30362_4057?fromerr=fiy27yllAuthor: CrazyinsomniaFirst, the concept of ROWIDStores the location of row in the data file: 64-bit encoded data, A-Z, A-Z, 0-9, +, and/,How row is stored in the data

Data is the core of the application, the program is broken the re-release of the machine can be, but once the loss of data, the loss will be irreversible, the program released to production, data backup is particularly important, because not all

After the Oracle database is installed, users such as Scott are locked by default and cannot log on to the database with Scott users.Log in with the user with ALTER USER database permission, and select Sysdba to execute the following command:Unlock

Oracle database table Space usage query:Select B.file_name Physical file name,B.tablespace_name table Space,b.bytes/1024/1024 size M,(B.bytes-sum (NVL (a.bytes,0)))/1024/1024 has used M,SUBSTR ((B.bytes-sum (NVL (a.bytes,0))/(b.bytes) *100,1,5)

Create or Replace procedureFind_info (PIDinch Number) as --Defining incoming VariablesV_namevarchar2(Ten);--Define name VariablesV_salary Number;--Define wage variablesSqlstrvarchar2( $);--defining encapsulated SQL statement

db:11.2.0.3.0View Oracle's redo log switching frequencyTwo SQL, the principle is the same, the second uses the statistical functionTime Unit: MinutesMethod One,SELECT * from V$log a WHERE a.thread# = 1; Set Line 200Select b.sequence#, B.first_time,a.

When we use the Oracle database, suddenly power outages, causing a lot of problems, resulting in the loss of old data, affecting the correctness of the data, destroying the database. At this point, users desperately need to recover data. This

1. Create a table in SYS mode that records the details of the client's login to the database serverCreate Tablelogon_logs (logon_time date,usernamevarchar2( -), machinevarchar2( -), Ipadrvarchar2( -), programvarchar2( -), modulevarchar2( -),

1. The Start command is[Email protected] ~]$ CD $ORACLE _home/bin[Email protected] ~]$/emctl start dbconsoleStop command Yes[Email protected] ~]$./emctl Stop DbconsoleView OEM Status[Email protected] ~]$/emctl status DbconsoleOracle's environment

Set Linesize 132Column name format A30Column value Format A25SelectX.KSPPINM name,Y.KSPPSTVL value,Y.KSPPSTDF IsDefault,Decode (Bitand (y.ksppstvf,7), 1, ' MODIFIED ', 4, ' system_mod ', ' FALSE ') Ismod,Decode (Bitand (y.ksppstvf,2), 2, ' TRUE ', '

[Email protected] ~]# more/etc/oracle-releaseOracle Linux Server Release 5.7Oracle Database 11g Enterprise Edition Release 11.2.0.3.0-64bit ProductionPL/SQL Release 11.2.0.3.0-productionCORE 11.2.0.3.0 ProductionTNS for Linux:version

1. Log in with an Oracle userIf you want to install again, it's best to do some backup work first.Includes the user's logon script, the database automatically starts the closed script, and the listener automatically starts the script.If possible,

Sql> create Pfile from SPFile;Modify the Pfile file, add the implied parameter *._enable_rename_user= ' TRUE ' to start the database in restrict mode1, [[email protected] ~]$ cd/u01/app/oracle/product/11.2.0/db1/dbs/2, [[email protected] dbs]$

[Translated from mos] "WARNING: Noclusterinterconnecthasbeenspecified" appears in the alert log of the database instance" "WARNING: No cluster interconnect has been specified" appears in the alert log of the database instance" Source:No Interconnect

Migrate the entire database and database1) migrate the entire database, and then upgrade the database. Step 1:Stop the database normally, and restart the database in read-only mode. Startup mountAlter database open read only;   Step 2:

Basic methods for creating indexes in Oracle databases, oracle Indexes How to create the best index? 1. Create an index explicitly create index index_name on table_name(field_name)tablespace tablespace_namepctfree 5initrans 2maxtrans

Dbca cannot identify an existing database When you delete an unnecessary test database at the customer's site and use dbca, the database cannot be found. It's strange that it's starting !! Later, I searched for oratab in the operating system and