Oracle

Oracle Study--aix 6.1 installation of Oracle 11gR2System environment: aix6100-09 (Patch: SP3)Oracle:oracle 11gR21. View System Hardware Information$ prtconf |moreSystem model:ibm,7028-6c4machine Serial number:1096b0dprocessor

What is Dbms_job?Dbms_job is one of the expert packages provided by the Oracle database.mainly used in the background to run the program, is an excellent tool in the database. Can be used to automatically adjust schedule routine tasks, such as

ImportJava.sql.*;Importjava.util.ArrayList;Importjava.util.List;//using the JDBC connection Public classTestora { Public Static voidMain (string[] args) {//TODO auto-generated Method StubBasedao Basedao=NewBasedao (); Connection

GrammarDelete from AATRUNCATE TABLE AAdifference1.delete from the back can write the condition, truncate not.2.delete from records are deleted, each row of records will go into the log, and truncate delete the entire page at once, so the day to the

First fromHttp://www.oracle.com/technetwork/database/features/instant-client/index-097480.htmlDownload version of Oracle Instant clientUnzip to the installation path you want mine is: D:\Program files\instantclient_12_1Copy your configured

1. Disable Oracle ServicesGo to Computer Management or Task Manager, in the service, find all the services at the beginning of Oracle, right click to select Stop2. in the Start menu, locate Universal Installer, run Oracle Universal Installer, click

In recent projects, the results of the completion of Hadoop operations (which exist on HDFs) need to be imported into Oracle, but when you import the Date field ' 2016-03-01 ' in HDFs with Sqoop, the Sqoop error says that the date type must be '

Referenced from: https://hacpai.com/article/1405392025960MySQL, SQL Server and other databases themselves with the primary key self-growth like auto_increment function can be used directlyUsegeneratedkeys= "true" to implement, such as the following

1, determine the database global variable name and instance nameDb_name = ORCLSID = ORCL2, Determine the database administrator authentication method;The administrator's authentication method includes the operating system authentication and the

The execution plan of SQL actually represents the specific execution steps of the target SQL within the Oracle database, and as a tuning, only know if the execution plan chosen by the optimizer is the best execution plan in the current situation,

Stored procedures for sending messagesCreate or replace procedure up_send_mail (SUBJECTINVARCHAR2), mail_content  in varchar2 (a), Re_out out number (2)) as/********************************* Write: Dead leaf effect: Send message Date: 2013-03-13

Oracle's paging query Oracle's paging query statements can be applied in a format that is given in this article. Paged Query format: SELECT* FROM (SELECT a.*, ROWNUM RN from (SELECT* FROM table_name) A where ROWNUM = 21one of the most inner queries

How to combine SQL scripts and PL/Developer tools to create a tablespace, create a database, back up a database, restore a database, and so on, and then implement operations such as Oracle object creation, import data, and so on, so we can quickly

Recording Head (record header) format:typedefstructrh0 {uint32_t recordlen; uint8_t VLD; //directly determines the entire record head sizeuint8_t Unknown0; uint16_t Rhscnwrapper; uint32_t rhscnbase; uint16_t SUBSCN;}

Example 1: Set up a trigger, when the Staff table EMP table is deleted a record, the deleted records are written to the Staff table delete log table. CREATE TABLEEmp_his as SELECT * fromEmpWHERE 1=2; CREATE OR REPLACE TRIGGERTr_del_emp beforeDELETE

Insert into Pntmall_point_detail (pntmall_pnt_id, ...). Hpt_left_point,hpt_fullredempt_status) SELECT pntmall_pnt_id,......., pntmall_num,0 from Pntmall_point_detail_tmp a W Here isn't EXISTS (SELECT b.pntmall_pnt_id from pntmall_point_detail b

Subquery: Contains another query inside a query.Normal subquery--Query for information about all employees that are higher than the 7654 wage select * from emp e where e.sal > (select Sal from emp where empno = 7654);--query out wages higher than 765

Write a batch processing script in Windows to start and reset the Oracle database. Cmd start Oracle DatabaseCreate a bat file, copy the content, and double-click it to start. @echo off net start OracleXETNSListener 2>nul net start OracleServiceXE

Oracle SQL statement optimization, oraclesql (1) select the most efficient table name sequence (only valid in the rule-based Optimizer ):The Oracle parser processes the table names in the FROM clause in the order FROM right to left. The table

When Does Oracle need Commit or OracleCommit? After writing the DML Statement (update, insert, delete), you need to manually COMMIT. If there is no COMMIT, the updated content will be saved to the memory instead of submitted to the database, will