標籤:When Oracle Database executes a SQL statement, it stores the result set and processing information in an unnamedprivate SQL area. A pointer to this unnamed area, called acursor, lets youretrieve the rows of the result set one at a time.Cursor
標籤:怎樣看懂Oracle的執行計畫一、什麼是執行計畫An explain plan is a representation of the access path that is taken when a query is executed within Oracle.二、如何訪問資料At the physical level Oracle reads blocks of data. The smallest amount ofdata read is a single Oracle
標籤:oracle 字元集 utf8 zhs16gbk linux 安裝完ORACLE後發現字元集設定錯誤,因此需要修改字元集,修改方法如下:系統內容:CentOS 6.5ORACLE版本:10.21、登入到系統,切換到oracle使用者權限# su - oracle2、接著輸入:$ sqlplus / as
標籤: 大過年的還要敲代碼,想想也是醉人。今天忙著趕畢設,在做功能測試的時候發現id的值一直為0,一看就知道id的值沒有自增,一直預設為0了。於是去百度了一番,默默調試,找到下面這段代碼: <selectKey keyProperty="id" resultType="int" order="BEFORE"> SELECT SEQ_RESULT_ID.nextval as id FROM
標籤:Incremental Backup: 2 個層級,level 0 和level 1, 0 級備份包含資料檔案中所有block,1 級備份改變的block,執行增量備份的時候,要先做0 級備份,作為增量備份的基礎.(1)An INCREMENTAL backup at level 0 backs up all data blocks in datafiles being backed up.(2)A level 1 backup copies only changed blocks. A