Oracle

The partition outer join implements the conversion of sparse data to dense data, for example:With T as (select Deptno, Job, sum (SAL) sum_sal from EMP Group by DEPTNO, job), TT as (select DISTINCT job from T) Select B. Deptno, A.job, sum_sal from

Oracle deadlock problem has been bothering us, here is to teach you an Oracle deadlock check method, if you have encountered the problem of Oracle deadlock, may wish to see ...Oracle deadlock problem has been bothering us, let's teach you an Oracle

Ideas: The database that creates a Utf-8 instance is used as the build environment for the database. Using the PL SQL tool, the creation statement of the database is exported, executed in the Utf-8 database, and the skeleton structure of

Oracle Create User:CREATE user username identified by password [account lock| UNLOCK]"Note" lock| Unlock is locked when the user is created, and is locked by default. A locked user cannot log on properly for database operation.For example, create a

Environment: Oracle 11gI. Transfer of AUTHORITY1. If you are passing object permissions, add the following with GRANT option;Eg:system the user has a table for temp, and only wants to usertest the user has permission to query, then:Grant Select on

Overview:The lock table is a very easy phenomenon, and it is easy to happen when more than one person is working on a table. Here are the steps to resolve the lock tableLock table Reason:Since the Oracle database maintains data consistency, when one

Using System;Using System.Collections.Generic;Using System.Data;Using System.Linq;Using System.Runtime.Serialization.Json;Using System.Text.RegularExpressions;Using System.Web;Using System.Web.UI;Using System.Web.UI.WebControls;Using Common;Using

The index is a powerful weapon to improve the query performance of the database.No index, like the same tag library no books, looking for books, they want to book than the sky is still difficult. , especially in the case of batch DML, the

-------self-tuning planBeginDbms_workload_repository.create_snapshot ();EndSelect/*+ Result_cache */COUNT (*) from (SELECT * from Hj.dbtan where object_type= ' TABLE ' ORDER by 1 desc, 2 ASC, 3 desc , 4

Http://www.cnblogs.com/chen1388/archive/2010/09/25/1834827.htmlThe connect by prior recursive algorithm in OracleThe basic syntax is:Select ... from tablename start with condition 1Connect by Condition 2Where Condition 3;Cases:SELECT * FROM

Test data: Sql> CREATE TABLE Test1 as SELECT * from Dba_objects; Table created. Sql> CREATE TABLE Test2 as SELECT * from User_objects; Table created. Sql> CREATE TABLE Test3 as SELECT * from Dba_objects; Table created.Collect

To_date () is one of the representative functions of Oracle database functions, and the following is a detailed description of several uses of the Oracle To_date () function, which can be referenced by a friend In Oracle database, the Oracle

The client cannot connect to the server-side database for reasons such as network, configuration, file access, whether the database service has been started, and so on, the following are the general troubleshooting steps:1. Check whether the

Distinguishing between databases and instances: an instance refers to a variety of memory structures and service processes, and the database is the storage disk space in the object.DB Instance Startup:startup [Nomount | mount | open | force]

In the http://lqding.blog.51cto.com/9123978/1695162 article we implemented the DML operation synchronization of the table.We do the following testsTruncate on the source side of the execution tablesql> truncate TABLE Tcustmer; Table truncated.On the

Change the third column value in/etc/oratab to Y, default to N, or to WThe format is as follows: orcl:/u01/oracle/product/11.2/db_1:Y Write startup services, create in/etc/init.d/Simple as follows:#!/bin/shOpt_=$1Case ' $OPT _ ' inStart/bin/echo "$

Sometimes, because of a sudden power outage or other reason, PL/SQL It cannot even display, sequence, and other elements in a database table. Use SQL Windows to run queries for general queries, logins, or the same phenomenon again.I am not able to

instr   (source string, target string, start position, match ordinal)    in Oracle/plsql, the INSTR function returns the position of the string to intercept in the source string. Retrieved only once, that is, the end of the character from the

V$sqltext: The stored full sql,sql is splitV$sqlarea: Stored SQL and some related information, such as the cumulative number of executions, logical reading, physical reading and other statistical information (statistics)V$sql: A SQL statement that

Solution for Oracle installation prerequisite Check Failure[Java] installation environment: Win7-64bit Pro, Memory 6G, hard disk space enough to install the version: Oracle Database 11g Release 2 (11.2.0.1.0) for Microsoft Windows (x64) installation