Oracle

Oracle USER-related data dictionary: USER, ALL, and DBA. USER _ *: information about the object owned by the USER, that is, information about the object created by the USER www.2cto.com ALL _ *: information about the object that the USER can access,

Application scenarios of oracle set operations and exists and in 1 set operation definitions: displays the result sets of Multiple SQL statements in a logical integrated operation. By default, set operations are sorted in ascending order of the

Oracle adds fields and then updates the statement in batches. This business requirement is: a new field is added to t_bnet_customer in an old table. This field is included in t_customer_extend in another table, the original statement: www.2cto.com

The I/O utilization rate is 100% at a time, and a large number of full table scans in the database are described. 1. It is unclear what services are affected. However, from the system test, host IO resources are relatively tight (HPUX 11.31 + oracle

In oracle, the single quotes in oralce are escaped. strings are referenced by single quotes, and the escape is also completed by single quotes. This is a headache for many beginners, especially those who are learning dynamic SQL. In simple single

Oracle 10g RAC add log groups and members and delete log members SQL> alter database add logfile thread 1 group5 ('+ data/myrac/onlinelog/myrac1_redolog_group5_01') size 100 m; SQL> alter database add logfile member '+ data/myrac/onlinelog/myrackets

Oracle's rownum principle and usage in Oracle, You need to query the first N records according to specific conditions, with a rownum. Select * from emp where rownum " for rownum, which means, if you want to use select * from emp where rownum> 5, it

Oracle role management overview roles are a classification management method for users, similar to the "create post authorization" that is often mentioned in business systems, users with different permissions can be divided into different roles. For

Differences between stored procedures and functions in Oracle stored procedures and functions: www.2cto.com example: [SQL] // create or replace procedure add_emailinfo (namee email_info.fullname % type, address email_info.email_address % type) is

Description of Oracle AutoTrace optimization output content SQLPLUS AutoTrace is a simple and convenient tool for analyzing SQL Execution plans and execution efficiency. It is also a useful tool in most cases. The SQL Execution Plan and execution

The not in problem in oracle has been busy recently. It's not a day or a night. I haven't had time to write a blog for a long time. Today, it's a very strange problem. It's been a long time since I had to write a blog. Www.2cto.com [SQL] select *

In Oracle, the SQL statement is used to display the calendar month 01 select max (decode (dow, 1, d, null) Sun, 02 max (decode (dow, 2, d, null )) mon, 03 max (decode (dow, 3, d, null) Tue, 04 max (decode (dow, 4, d, null) Wed, 05 max (decode (dow, 5

Oracle Aggregate functions --- percent_rank () and cume_dist () Specify the relative position of the grouping sequence PERCENT_RANK (expr [, expr]...) within group (order by expr [DESC | ASC] [NULLS {FIRST | LAST}] [, expr [DESC | ASC] [NULLS {FIRST

Create, assign, and traverse arrays in Oracle 1. Create www.2cto.com 1. Syntax: Create Or Replace Type "TypeName" Is Varry (int) Of varryType (int); TypeName: array name Int: Maximum length of the array varryType (int): TYPE and length of the array.

Oracle Database permission transfer 1. system permission transfer super administrator grants lisi the administrative permission to modify any table: SQL> grant alter any table to lisi with admin option; authorization successful. View system

Oracle Database full backup recovery and partial Backup recovery today encountered Oracle Database sequence problems, simply a full database backup and recovery. The following imp/exp table mode backup: ­ oracle @ sencloudServer: exp

Create a table space test_data logging datafile 'e: /oracle/product/10.2.0/oradata/testserver/test_data01.dbf 'size 32 m autoextend on next 32 m maxsize 2048 m extent management local; www.2cto.com 2. // create a user and specify the tablespace

ORACLE system tables and views (check in time) 1. system tables the system parameters of the ORACLE database are stored in the database. You can use SQLPLUS to query the system parameters in SYSYTEM. Several important tables or views are as follows:

Oracle's problem about WKT construction of SDO_GEOMETRY is that the system uses the OpenLayers framework at the front end, and the background database uses oracle spatial. We all know that the SDO_GEOMETRY of Oracle spatial is very complicated. If

When oracle executes the update statement, the problem is solved. During project development today, in order to test the SQL Execution effect in the project, PLSQL Developer executes the statement. Without commit, the code will continue to be typed,