Oracle

1. It is best to use analysis functions. Row_number () over (partition by col1 order by col2) For example, if you want to retrieve-records, sort them by tname. Select tname, tabtype from (Select tname, tabtype, row_number () over (order by

Software provisioning Mgr, a powerful tool launched by SAP recently, can be used to directly use Oracle 11g in ecc6 sr3 installation.   However, there will be a NW 7.2 kernel you want to choose during the installation process. This is

Queue An enqueue is a shared memory structure that is always related to transactions and sessions. It is used to access database resources serially.   Queue type There are many types of queues in Oracle. The following are common types:

Recently, SAP archiving and Database Reorganization have just been completed. After the database reorganization, the temporary tablespace is reduced to make reasonable use of resources. The steps are as follows: 1. Create a new temporary tablespace

Restore accidentally deleted data information: 1. Execute alter table table_name enable row movement; 2. Execute flashback table table_name to timestamp to_timestamp ('2017-05-24 14:59:36 ', 'yyyy-mm-dd hh24: MI: ss '); Query historical

create table lck (a number, b number);insert into lck values (1,2);insert into lck values (2,4);insert into lck values (3,6);insert into lck values (4,8);insert into lck values (5,3);insert into lck values (6,5);insert into lck values

For a DBA, starting and disabling Oracle databases is a common and basic operation. Sometimes Linux administrators or programmers also need to perform some basic DBA operations in the development database, therefore, it is important for non-DBA

1. Introduction to spfile Spfile is a parameter file when an oracle instance is started. The default location of this file is $ ORACLE_HOME/dbs. The default file name is spfile $ oracle_sid.ora. Compared with the old init. ora parameter file, spfile

Submitted by Irfan Haq on Mon RDBMS Server Sometimes it is a rouge query, sometimes a simple data clean up effort by the users, whatever may the cause be, inadvertent data-loss is a very common phenomenon. backup and recovery capabilities are

What is join?---------------------• In a straightforward a join is a query that combines rows from two or more tables, views, or materialized views. • Oracle Database performs a join whenever multiple tables appear in the from clause of the query. •

For DBAs, starting and disabling Oracle listeners is a basic task, but Linux system administrators or Programmers sometimes need to perform some basic DBA operations in the development database, therefore, it is important for them to understand some

Control Structure Control code lines of PL/SQL program flows. PL/SQL supports Conditional Control and cyclic control structure. Syntax and purpose if .. then Syntax: If condition then statements 1; Statements 2 ;.... the end if statement determines

Table of Contents 1 is an ORACLE trigger used in a scenario. It is a series of DB operations that are passively triggered when the conditions are consistent. A trigger is a passive action triggered by the Oracle database. Unlike a stored procedure,

After installation, you can find a text file: oracle \ product \ 10.2.0 \ db_1 \ Network \ admin \ listener. ora also has a tnsnames in the same path. ora file. The information in these two texts must be the same. For example: listener. ora #

Implementation Method 1:Create a sequence with a minimum value of 1 and a serial number with a maximum value of nomaxvalue that automatically Loops Create sequence nameIncrement by 1Start with 1NomaxvalueNocycle; When inserting data into a table,

The paging program used to query Oracle databases in ASP does not use stored procedures, and the efficiency is acceptable. The Code is as follows: '''' The snow paging tool of Sebei (Oracle) does not need stored procedures ------------------------- '

1. To optimize the query, try to avoid full table scanning. First, consider creating an index on the columns involved in where and order.2. Try to avoid null value determination on the field in the WHERE clause. Otherwise, the engine will discard

Author: skate Time: 2011-02-14   Analysis of Oracle number   Understanding number from the following aspects 1. Value Range2. Occupied storage space3. Number Performance   We usually define that numbers are used to store columns. However, Oracle is

When starting oracle on the local machine today, an error is prompted: "The oracleorahome92tnslistener service cannot be started on the local computer. Error 3: The specified path cannot be found" Start the command in cmd:   C:/Documents and

I. No create session privilege1: create user beyondsanli identified by beyondsanli;Use beyondsanli normal to log on at this time and report no create sessionIn this case, you must use the System user to specify the session permission.2: grant create