what is oracle exadata

I started this question because a friend on MSN asked me today,What is DSI?.This is the first question. DSI isData Server InternalsIt is an internal teaching material used by Oracle to train Oracle aftersales engineers.Such docum

[Translated from mos] What is the difference between basic table compression and advanced compression in oracle databases?Differences between basic table compression and advanced compression,Extracted from the mos Article Difference Between Basic Table Compression And Advanced Compression (Doc ID 1548187.1)Applicable:Oracle Database-Enterprise Edition-Version 10.

Now explain what "high water level" is: Logical storage structure of Oracle: Tablespace--> segment--> Area--> block Block: is the smallest storage unit, now the standard block size is 8k,oracle every I/O operation

Sqlserver does not support set difference and intersection operations. I recently developed a database based on sqlserver2000.Program. There is a part of the computation that requires a large number of aggregate queries. I found a query operation statement through the data. Except The syntax structure is: (Sql1)Except(Sql2) However, no matter how I execute it, an error occurs: There

The Sql*plus user name in Oracle is the system user, and the password is the password you set.If the password is forgotten, it can be reset by the following method.1, Win key +r key, enter cmd, open command prompt.2. Input Sqlplus/nolog3. Continue entering Conn/as SYSDBA4. Enter the ALTER user name identified by passwo

--The query field in what tableSelect * from where t.column_name='ABC';--Query What table the field is in and determine if it is a primary keySelect * fromAll_tab_cols T Left Join ( SelectA.table_name, A.constraint_name, A.column_name, B.constraint_type--field Constraint type (P: primary key)

---------------------------------------------------------------------------------------- + |Id|Operation|Name|Rows|Bytes|Cost (%CPU)|Time| A ---------------------------------------------------------------------------------------- the | 0 | SELECTSTATEMENT| | 1 | 207 | 2(0)| xx:xx: on | + | 1 | TABLEACCESS by INDEXROWID|ECHO| 1 | 207 | 2(0)| xx:xx: on | - |* 2 | INDEXRANGE SCAN|Echo_ind| 1 | | 1(0)| xx:xx: on | $ -------------------------

What is the difference between Oracle functions and stored procedures1. The difference between the return value, the function has 1 return values, and the stored procedure is returned by the parameter, can have more or No 2. The difference between the calls, the function can be called directly in the query statement, T

RAM2), when RAM is 2-16GB, swap size is recommended equal to RAM size3), Ram greater than 16GB, swap size recommended 16GB4, large memory environment swap size configuration recommendationsDue to the rapid decline in memory prices, the current production system server memory 256GB, 512GB is no surprise, the author recommends 16-64gb physical memory, swap and phy

Tags: select process another business PST TPS definition VPS RelatedA trigger (trigger) is a special stored procedure whose execution is not invoked by the program or manually, but is triggered by an event, such as when an operation on a table (Insert,delete, update) activates it for execution. Triggers are often used to enforce data integrity constraints, busine

In oracle, what happens when a value in date time format is inserted into a field in varchar2 format ?, Oraclevarchar2 -- Create Table test1 Create table TEST1(ID VARCHAR2 (40) default sys_guid (),TDATE VARCHAR2 (200))Tablespace APP_TX_DATAPctfree 10Pctused 40Initrans 1Maxtrans 255Storage(Initial 64 KMinextents 1Maxextents unlimited); -- Insert date time format

been performed. 6, Master table reorganization. 7, materialized view registration failed at the master site. 8. Incorrect conversion of a materialized view log from ROWID to primary key. 9. Manual deletion of sys.slog$ entry for the materialized view. Third, the solution 1. Full volume refresh materialized view exec Dbms_mview.refresh (' SCOTT. User_table ', ' C '); exec Dbms_mview.refresh (' SCOTT. User_table '); 2. Adjust the content of fast and comfortable log SELECT * FROM sys.slog$SELECT

If you want to give you a minute to become the president of Oracle, you don't need to wear Larry Ellison's expensive suit on his yacht, but let you decide the fate of MySQL, what do you do? I just spent 7.4 billion yuan to acquire Sun Microsystems, and the European Commission for anti-monopoly investigations suddenly moved out of this everyone's favorite open-source database to find you. How do you choose?

Label:What is the acronym for Oracle's TNS?Transparent Network substrate (transparent net bottom, that is, regardless of the underlying network layer with what protocol for the upper layer of application is transparent, that is,The application layer on the upper level does n

As an Oracle DBA, you must know what Metalink is.Metalink is the official technical support site for Oracle, its url: http://metalink.oracle.com. Oracle uses this website to support customers around the world. According to statistics from

Turn: What is the difference between MySQL and Oracle? 1. Oracle is a large database, while Mysql is a small and medium-sized database. The market share of Oracle

What is the silence killer of Oracle server virtualization VMware? -- Linux Enterprise Application-Linux server application information. For details, refer to the following section. Although Wall Street and the IT industry are still pushing for VMware, the company has apparently encountered serious challenges. According to the ESG research firm, large enterprises

the data, such a huge table, so that the logical backup of data, query, and even based on log table fallback has produced a huge efficiency problem. How can I quickly and efficiently delete log information from three months ago, how can I quickly retrieve information about the current month, how to make full use of the physical environment of multiple disk space (bare devices), and increase the degree of parallelism balance I/O to improve the usability of the performance-enhancing database? T

[Translated from mos] What is split-brain in Oracle Clusterware and RAC? mosclusterware What is split-brain in Oracle Clusterware and RAC? Source:What is Split Brain in

:10.2.0.5, 11.1.0.7.3, 11.1.0 .7 Patch for Windows and 11.2.0.1 4. Bug 7587008-hung RAC instance not evicted from cluster Document 7587008.8 Fixed in:10.2.0.4.4, 10.2.0.5 and 11.2.0 .1, one-off patch available for various 11.1.0.7 release 5. Bug 11890804-LMHB crashes instance with ORA-29770 after long "control file sequential read" Waits Document 11890804.8 Fixed in 11.2.0.2.5, 11.2.0.3 and 11.2.0.2 patches on Windows 6. Bug:13732226-node GETS Evicted with REASON CODE 0X2 Bug:13399435-kjfcdr