As Database Administrators are required to scale their databases to handle the challenges of Web-basedaccess, B2B and E-commerce, faster hardware and more resources may only be a part of the solution.Poor locking strategies can cripple even the most
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
Oracle Security Tips by Burleson ConsultingThis is an excerpt from the bestselling book "Oracle Privacy Security Auditing", a complete Oracle security reference with working Oracle security scripts. Useful Scripts for AuditingTo see what statement
通過使用OleDb操作Oracle資料庫,成功實現圖片上傳到Blob類型的欄位,但有時會發生ORA-01036錯誤的問題,經查詢是錯誤提示為illegal variable name/number,不知道有誰能詳細解釋illegal variable name/number的意思Oracle Data Provider for .NETHiI am using ODP.NET (Oracle Data Provider for .NET) in my asp.net application.I
1.對查詢進行最佳化,應盡量避免全表掃描,首先應考慮在 where 及 order by 涉及的列上建立索引。2.應盡量避免在 where 子句中對欄位進行 null 值判斷,否則將導致引擎放棄使用索引而進行全表掃描,如:select id from t where num is null可以在num上設定預設值0,確保表中num列沒有null值,然後這樣查詢:select id from t where num=03.應盡量避免在 where
author:skatetime:2010/09/07oracle的resetlogs機制淺析 alter database open resetlogs 這個命令我想大家都很熟悉了,那有沒有想過這個resetlogs選項為什麼要用?什麼時候用?它的原理機制是什嗎?他都起哪些作用? 我們都知道資料在啟動時候是要做一致性檢查的,oracle在open階段要做兩次檢查1. 檢查資料檔案頭的檢查點計數(checkpoint cnt)是否和控制檔案的檢查點計數(checkpoint