Oracle

1. First query free space select tablespace_name,file_id,block_id,bytes,blocks from dba_free_space;   2. Add Oracle tablespace First, query the data file name, size, and path information. The statement is as follows: select

-- Obtain the select TRUNC (SYSDATE) FROM dual; -- Obtain the 23: 59 minutes and 59 seconds of the current day (add one day and then minus one second based on the 00:00:00 of the current day) select trunc (SYSDATE) + 1-1/86400 FROM dual; -- the

  Alter any cluster: modify the permissions of any cluster   Alter any index   Alter any role Modify permissions of any role   Alter any sequence   Alter any snapshot   Alter any table   Alter any trigger   Alter cluster Modify permissions on

Keywords: Oracle Oracle with statement example WITH a AS (SELECT * FROM bd_member where rownum B AS (SELECT * FROM tp_trade_card)Select A. MEMBER_NAME,B. CARD_NOFrom,BWhere A. BD_MEMBER_ID = B. BD_MEMBER_ID   Google Search: Oracle + with view to get

  In normal project development, the paging stored procedure uses a large number of stored procedures. top is often used in the SQL Server paging stored procedure, and RowNum is often used in Oracle. Now, there is a UserInfo table, where one field

/* -- Function: Convert the string to the year, month, and day format, and delete the time, minute, and second. -- Source: http://jorkin.reallydo.com/article.asp? Id = 529 -- Parameter: Datechar varchar2 -- Oracle9i passed the test */ Create or

I. Improve database performance 1. Use explain plan to check SQL statement Performance Specific operations: Generate a plan_table table Run rdbms \ admin \ utlxplain. SQL Explain plan set statement_id = 'statement1 'into plan_table For select * from

Single-record functions in SQL1. ASCIIReturns the decimal number corresponding to the specified character;SQL> select ascii ('A') A, ascii ('A') A, ascii ('0') zero, ascii ('') space from dual; A ZERO SPACE------------------------------------65 97 48

Oracle table partition and index partition Summary To simplify the management of large tables in the database, for example, data warehouses are generally measured in terabytes. partition options are introduced after oracle8. partitions are separated

Oracle OS authentication and password files 1. OS AuthenticationAfter oracle is installed, OS authentication is enabled by default. The OS authentication mentioned here refers to the server-side OS authentication. OS authentication means that the

Reference 1. Explicit cursor Explicit is relative to implicit cursor, that is, there is a clear declared cursor. The declaration of an explicit cursor is similar to the following (for detailed syntax, refer to plsql ref doc ): Cursor cursor_name

1. Hardware requirements 1.1 memory at least 512 MB. Use the following command to check Grep MemTotal/proc/meminfo 1.2 swap partition at least 1 GB Grep SwapTotal/proc/meminfo 1.3/tmp directory idle zone at least 400 mb Df-k/tmp 400 M 1.4 Hard Drive

Materialized views are similar to indexes in many aspects: materialized views are used to improve query performance, while materialized views are transparent to applications, adding or deleting materialized views does not affect the correctness and

Part 3 backup and recovery[Q] How to enable/disable Archiving[A] If archiving is enabled, ensure log_archive_start = true to enable automatic archiving. Otherwise, only manual archiving is supported. If archiving is disabled, set this parameter to

(I found it online. I cannot remember the original address. I will record it here and read it later)   Oracle Database customization is very powerful. Oracle not only allows users to customize their own functions, but also can customize their own

From today on, I started to prepare a system to learn about Oracle. In addition to meeting the urgent needs of my work, I also hope to have a good understanding of the profound and profound knowledge of Oracle Database. Now, I used to write SQL

This document uses examples to teach you how to implement the select top n method in Oracle.1. implement select top n in Oracle:Since ORACLE does not support the select top statement, order by and ROWNUM are often used in ORACLE to query the select

System Environment:1. Operating System: Windows 2000 Pro2. Database: Oracle9I Release 9.2.0.3.03. installation path: D: \ ORACLE Steps for creating a database:1. manually create related directoriesD: \ Oracle \ admin \ ora92D: \ Oracle \ admin \ ora9

I. Glossary (1) SGA: System Global Area is a basic component of Oracle Instance, which is allocated when the Instance is started. The System fully-local SGA consists of three parts: the Shared Pool, data buffer, and log buffer.(2) Shared Pool:

By default, the database locks the user after 10 failed attempts; 1. view the FAILED_LOGIN_ATTEMPTS Value Select * from dba_profiles; 2. Change it to 30 alter profile default limit FAILED_LOGIN_ATTEMPTS 30; 3. Change it to an unlimited