Oracle

The LAG () and lead () statistics functions are able to fetch the first n rows of the same field and the values of the last n rows in a single query . Such operations can be implemented using table joins to the same table, but using lags and leads

1.1.1. RMAN-08138Date: 2014-05-21 14:36Environment: Test environment"Scenario description"On the test machine, when you use Rman to delete archived log files, you are prompted to warning a warning and the archive log cannot be deleted."Error Message"

Oracle Delete duplicate rowsCategory: ORACLE2010-12-12 17:10423 people readComments (0)CollectionReportOracletabledeleteintegerinsert.netSQL statement for querying and deleting duplicate records1, look for redundant records in the table, duplicate

Oracle Rights ManagementFirst, the Classification of rights:System permissions: The system specifies the user's permission to use the database. (System permissions are for users).Entity permissions: A permission user's access to other users ' tables

Oracle kills Deadlock ProcessFirst look at which tables are locked:Select B.owner,b.object_name,a.session_id,a.locked_modefrom v$locked_object a,dba_objects bwhere b.object_id = a.object_id;owner        object_name         session_id locked_mode-----

Ash and awr relationships Ash is based on v$session, sampling once per second, recording events waiting for an active session. Inactive sessions are not sampled, and sampling work is done by the newly introduced background process MMNL.Ash memory

Identify certification, determine; Identity identity, individuality;Local connection sqlplus scott/[email protected]: 1521/orcl This sentence equals Sqlplus Scott/tigerRemote connection (Oracle on virtual machine) sqlplus scott/[email protected]: 152

CREATE OR REPLACE PROCEDURE prc_wap_activeusers (RETCODE out VARCHAR2) /*********************************************************** * Function: WAP indicator--Active user Statistics (batch submission) * Parameters: RETCODE (return code: 0000

1. Creating table complete syntax create TABLE [schema.] Table (column datatype [, column datatype] ...) [Tablespace tablespace] [PCTFREE integer] [Pctused integer] [Initrans integer] [Maxtrans integer] [STORAGE Storage-clause] [LOGGING | Nologging][

When you create a table, you must specify the data type for each column of the table. If the actual data does not match the data type of the column, the database rejects the save. Specify the date of birth for the student as "1980-13-31".In Oracle,

AIX 5.3 Installation Oracle 10g error Case--runinstallerSystem environment:Operating system: aix5300-08Oracle Software: Oracle 10g (64-bit)Error phenomena:Client an AIX host, previously installed Oracle, uninstalled Oracle software, and changed the

ObjectiveEnvironment Description: In this experiment, the main implementation of the Rhel-based 6.5 64bit system successfully installed Oracle 11g R2 64bit, the experimental platform based on VMware VSphere. Media Download: VMware ESXi 5.5.0 (1331820

Win7 the ultimate version of the installation oracle11g, the database can be used normally, restart the system, connect to the database again, prompt:Ora-12514:tns: Listener currently does not recognize the requested service in the connection

Server-side:Listener LsnrctlStart monitoring lsnrctl start [LISTENER]View monitor lsnrctl status or LSNRCTL serviceC:\Documents andSettings\Administrator>Lsnrctl Servicelsnrctl for +-bitWindows:version10.2.0.1.0 -Production on +-Copyright May (c)19

Copy the Ojdbc6.jar Tomcat-jdbc-7.0.37.jar to the web-inf\lib below the project. First, add the information in the Tomcat configuration file Tomcat7.0\conf\context.xml:? 1 2 3 4 5 6 7 8 9 10 11 xml version=‘1.0‘

An issue with the left JOIN association that Oracle uses when using case in query results cannot be judgedQuery method One:1 SELECT 2 Case when(SELECT CAST(SUM( Case3 when(Allocable_prime_currency_value is NULL andState_ind= 1) Then4NVL

Symptoms: 1. TCP/IP connections are on-pass. You can test with the ping command.2. The Oracle listener on the server has been started. Lsnrctl Status View listener status Lsnrctl start to start Oracle Listener3. The error message that the client

When CentOS6.2 64-bit Oracle11g is installed, check package cannot pass. In fact, this problem occurs in 11g. It is estimated that this problem will occur in earlier versions of oracle, the 64-bit and 32-bit packages of the corresponding package

Oracle Process Structure A process is created dynamically and disappears after the task is completed. A program is a static entity and can be copied and edited. The process emphasizes the execution process, while the program is only an ordered set

Concept description ORACLE databases are divided into national character set and database character set. Both of them must be set during database creation. The National Character Set is mainly used for field data of the NCHAR, NVARCHAR, and NCLOB