Oracle

The syntax is the same as the other SQL database tutorials, as follows DELETE from Courses WHERE course_designater = ' Java110 ' A more complex method of operation by condition DELETE from Classconvenings WHERE CLASSES_NUM_FK > 4 and

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 empty table of the 1

Some of your own optimization summaries of Oracle SQL are also documented and want to help: One: use where less to use having; Second: Check more than two tables, the record less on the right; Third: Reduce the number of visits to the table;

SQL Server to take data to Oracle often need to use the transparent gateway provided by Oracle to achieve, before also successfully configured two times, today again when the configuration to forget how to configure before, toss a half-day a variety

An extended stored procedure calls another stored procedure, example:Called stored procedure: Finally, a cursor is returned, and the cursor returns a value. The stored procedure that calls this stored procedure also needs to get it.

Six of the Oracle Learning Primer seriesModeWe learned the database structure, memory structure and process in Oracle database. The length of the toad feels too much. This time to take a rest, each note should not be too much, or different from the

Two stored procedures and stored functions: procedure1.hello WorldCreate or Replace procedure is begin dbms_output.put_line ('helloworld'); End Hello_world;2. - Raise the salary for the specified employee and print the salary before the rise

In Oracle 11gR2, the features of the scan (single clientaccess Name) are introduced. Scan is a domain name, can resolve at least 1 IP, up to 3 scan IP, the client can access the database through this scan name, in addition the scan IP must be with

1. PagingOracle: SELECT * FROM (select A.*, ROWNUM RN from (select t.* to Sj_receiptinfo T WHERE t.taxno like CONCAT ('% ', CONCAT (?, '% ')) ORDER BY t.id Desc) A WHERE ROWNUM ) WHERE RN >?MySQL: SELECT * from TableName where conditions Limit(

Oracle RAC Cache Fusion is the most central working mechanism of RAC. He took all the instances of the SGA virtual into a large SGA area, each time the different instances request the same data block, the data block will need to be passed between

A new feature in 11G that does not allocate segment when the table has no data to save spaceWorkaround such as:Second, oracle10g later provided the EXPDP/IMPDP tool, also can solve this problem1. How to export the EXPDP tool using:First set up

Method One: First establish a computational function1 Create or Replace functionCount_rows (table_nameinch varchar2,2Ownerinch varchar2 default NULL)3 return Number4AuthidCurrent_User5 is6Num_rows Number;7stmtvarchar2( -);8 begin9 ifOwner is

Oracle Database 12CR2 (Project Combat II): Linux system Installation Oracle12.2First, the subject of the course: Wind Brother Oracle Database Tutorial 12CR2 (Project Combat II): Install Oracle12.2 on Linux operating system.Second,

Many people create a sequence, but do not know how to use it in the INSERT statement, here is a brief introduction.Oracle sequence has two parameters: Nextval and Currval, when used, you need to enter Sequence_name.nextval or

At present, a considerable part of the company will use Oracle, when doing performance testing, the database monitoring is very important, then here first describes how to generate Oracle's own AWR monitoring report, and the specific report content

Oracle.install.responsefileversion=/oracle/install/rspfmt_dbinstall_response_schema_v11_2_ 0oracle.install.option=install_db_swonlydecline_security_updates=trueunix_group_name=oinstallinventory_

1. Cause of productionThis wait event typically occurs when the database is read in chunks, indicating that there is a wait associated with a full table scan and a quick index scan . This usually means too many full-table scans, or insufficient I/O

1, ready to installView the current version of Oracle and make sure it is older 11.2.0.1[[Email protected]_test_121_90 ~]$ rlwrap sqlplus/as sysdba sql*plus:release 11.2.0.1.0 Production on Fri Mar 17 15:20: Copyright (c) 1982, Oracle. All rights

(i) the concept of synonyms Synonyms are aliases for tables, views, indexes, or other schema objects in a database, similar to views, where synonyms do not occupy the actual storage space, and only the definition of synonyms in the data dictionary.

Http://www.cnblogs.com/beanbee/archive/2012/09/22/2697689.htmlTo manually build a ORACLE11GR2 database using the command lineBuild a database through the command line can help to better understand the database building process, today try to build