global temporary table oracle 11g performance

Affected Versions: Oracle MySQL 5.1.48-bzrracle MySQL 5.1.47Oracle MySQL 5.1.41Vulnerability description: Bugtraq id: 12798mysql is a widely used open-source relational database system with running versions on various platforms. If you use the create temporary table command to CREATE a temporary

How to export an empty table in Oracle 11g Because of the new features created by the delay segment of Oracle 11g, Oracle does not allocate data segments when there is no data insertion, leading to exp being unable to export the

Normally, Oracle automatically frees up temporary segment A when it completes a sort operation that uses the temp table space, such as a SELECT statement, create INDEX, and so on. But some of us will encounter the temporary segment has not been released, the temp table space

In Oracle, temporal tables are divided into session-level and transaction-level, and session-level temporal table data exists throughout the session until the end of the session, and the transaction-level temporary table data disappears after the transaction ends, that is, the Commit/rollback or end session clears the

Oracle 11G when exported with export, empty table can not guide 11G R2 has a new feature, when the table has no data, do not allocate segment to save space Workaround: Insert a row, and then rollback will produce segment. The method is to insert data in an empty

position, D.dname department name, Dtemp.Countnumber of departments, S.grade wage level fromEMP e,emp m,dept D, (SELECTDeptno DNO,COUNT(empno)Count fromEMPGROUP bydeptno) Dtemp,salgrade sWHEREE.sal>(SELECT AVG(SAL) fromEMP) andE.mgr=M.empno (+) andE.deptno=D.deptno andDtemp.dno (+)=D.deptno andE.salbetweenS.losal andS.hisal--61m-----Number of people using this wage levelSELECTS1.grade SG,COUNT(E1.empno)Count fromEMP e1,salgrade S1WHEREE1.salbetweenS1.losal andS1.hisalGROUP byS1.grade--Seventh

Oracle 11g realbench 2 (11.2.0.1) reports an error when exporting an empty table. After checking the cause, it turns out that an optimization was made in this version. During table creation, no storage space is allocated. The storage space is allocated only when data is inserted for the first time. This saves a lot of

First, the cause of the problem:A new feature in 11G that does not allocate segment when the table has no data to save space1, insert a row, and then rollback will produce segment. The method is to insert data into the empty table and then delete it, resulting in segment. When exporting, you can export empty tables.2. Set Deferred_segment_creation parametersSql>

and datafiles;Modify table space Size (Note: Modify = can be increased and can be reduced.) ）alter?database?datafile '/u01/app/oracle/oradata/orcl/ittbank.dbf ' resize 200m;Increase table space Size (Note: increase = can only increase, cannot be reduced.) ）alter tablespace ittbank add datafile '/u01/app/oracle/oradata

IamlaosongThe Oracle Temp table space is used primarily for querying and storing some buffer data. The primary reason for the temporary tablespace consumption is the need to sort the intermediate results of the query. The primary role of temporal tablespace:index Create or rebuildOrder by or GROUP byDistinct operationUnion or intersect or minusSort-merge joinsAn

Oracle 11g online reconstruction table Before Oracle9i appeared, you can only re-define the table by moving or exporting and importing the table. Therefore, the table redefinition process may be quite long or offline, during this

The redo generation of a temporary table is much less than that of a normal table, but undo is produced no less than a normal table. A simple example illustrates: Sql> Create global temporary

This article describes an example of using a temporary table to resolve table conflicts in Oracle, with an example of creating a temporary table Platform: Windows SP3 server Database: Oracle