Oracle

When the M role is input on the page, because the value "m role" Oracle will understand that there is a format in the content, that is, Oracle's responsibility can only store the content, the format is not the responsibility of the database,

The show_space version has many versions on the network. A general version is compiled today and will be used later.   Create or replace procedure show_space (v_segment_name in varchar2, Region in varchar2 Default User, v_segment_type in varchar2

In Oracle/PLSQL, The instr function returns the position of the string to be truncated in the source string. Syntax: instr (string1, string2 [, start_position [, nth_appearance]) String1 source string to be searched in this string. String2:

ODBC   New Version Driver = {Microsoft ODBC for Oracle}; server = myserveraddress; uid = myusername; Pwd = mypassword;     Old Version

1. Remove the double quotation marks in the SQL statement generated by Oracle.When you use powerdesigner to export a table creation SQL statement for the Orale database, double quotation marks are added to the table name and field name by default,

One of the show_space versions written by Tom is commonly used for Bucket analysis.   create or replace procedure show_space(p_segname in varchar2, p_owner in varchar2 default user,

  1 Definition Audit_sys_operations audits sysdba activities. The default value is false. The related audit information is not recorded in AUD $, because it is possible that the database has not been started yet and can only be recorded in files at

1 move Experiment SQL> Create Table my_objects_move tablespace assm as select * From all_objects where rownum Table created SQL> Create index I _my_objects_move on my_objects_move (object_id ); Index created   SQL> Delete from my_objects_move where

This article mainly describes the data of the number type and how to store it in the database. Composition of the 1 Number Type The number type of Oracle consists of up to three parts, which are "highest bit", "Data Part", and "symbol bit ". The

Try to change the access path As mentioned above, if an SQL statement is used to trigger sorting, it usually performs a full range scan. The following SQL statement:Select * from product where item_cd like 'AB %' and category like 'C %'Order by item_

It is found that only the index can be used to obtain the opportunity to query data. If you can effectively obtain data through indexes, it will undoubtedly provide a great help for query performance. However, if the index selection is poor or the

Join usageJoin)T1 {[inner] | {left | right | full} [outer]} join T2 on boolean_expressionT1 {[inner] | {left | right | full} [outer]} join T2 using (join column list)T1 natural {[inner] | {left | right | full} [outer]} join T2Inner and Outer are

This article describes the concepts and operations of Partitioned Tables from the following aspects: 1. Concepts of tablespaces and Partitioned Tables2. Specific functions of table partitions3. Advantages and Disadvantages of table partitions4.

Some colleagues often ask questions about character sets in Oracle databases, such as data migration in different databases and data exchange with other systems, migration failure or garbled data in the database is often caused by different

Background: Myeclipse character encoding GBK Oracle Database character encoding GBK The character encoding UTF-8 that inserts content from a third party using the WebService Interface   Problem description: Pre-compiled by Java

Author: skateTime: 2010/10/19 Insert Optimization To increase the insert speed, you must first know what affects the slow insert and generate redo and undo during insert execution. To increase the insert speed, when fully utilizing system resources,

The bulk collect usage of the Oracle database-related knowledge of batch addition, deletion, modification, is the content we will mainly introduce in this article, a key improvement of the forall statement, which can greatly simplify the code, and

We should not only write SQL statements, but also write SQL statements with excellent performance. The following sections will help the author learn, extract, and summarize some materials to share with you!(1) select the most efficient table name

PL/SQL developer   Remote connection to Oracle Database   I searched many methods online. This is feasible!   1. Configure the server tnsnames. ora file. If Oracle is not installed on the local machine, you can copy one (tnsnames. ora file) in the

The most common varcher2 type in Oracle can store a maximum of 4000 bytes of content. Generally, this type can meet your needs. However, in some special cases (for example, if the image or content to be stored exceeds 4000 bytes), varcher2 cannot