Oracle中忘記System和Sys密碼後的處理方法 本文介紹了有關Oracle中忘記System和Sys密碼後的處理方法,一種是OS驗證,另一種密碼檔案驗證方式。 Oracle提供兩種驗證方式,一種是OS驗證,另一種密碼檔案驗證方式 如果是第一種方式用以下方法修改密碼: sqlplus /nolog; connect / as sysdba alter user sys identified by ;
ORACLE 執行計畫分析一、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 of data read is a single Oracle block,
1) To install the basic JServer in the Oracle database.. i.e. CompleteJava Runtime, you must run $ORACLE_HOME/javavm/install/initjvm.sql asSYS. This will give you base JServer which is required to install anyadditional Java related add-ons. After
oracle 觸發器可分為DML觸發器,instead of 觸發器,系統觸發器三種。 其中只有DML的update 才支援列層級的觸發器。、格式如下:create or replace trigger T_namebefore update of column1,colum2 on tablefor each rowbegin end T_name; instead of 觸發器都是行層級的觸發器 許可權的也可以控制到列層級update(表的列)grant update(列1,列2)