CSDN裡的一個朋友問到了這個索引覆蓋的概念。 這個概念很小的知識點,在我的論壇裡有解釋“”,不過作為Oracle版主,不能在回帖裡加上網外的地址連結,所以這裡在CSDN裡帖上一份 比如有複合索引為3個欄位:f1 + f2 + f3,請問: 1: select f1, f2, f3, f4 from table where f1 = 'XX' and f2 = 'XX'. 2: select f1, f2, f3 from table where f1 = 'XX' and f2 = 'XX'
Similar to Oracle database, DB2 also has the conception of table space. A table space is the storage structure containing tables, indexes, larger objects/long data such as LOB Object, therefore the table space orginze these datas in database to
Oracle MYSQL DB2 sql分頁Oracle, MYSQL, DB2, sql, paginationOracleselect * from (select rownum,name from user_tables where rownum <= endIndex)where rownum > startIndex如果加了order就更麻煩了select * from (select rownum,name from user_tables order by
1.GSD global services daemon oracle官方文檔的描述 The Global Services Daemon (GSD) runs on each node with one GSD process per node. The GSD coordinates with the cluster manager to receive requests from clients such as the DBCA, EM, and the SRVCTL utility
Oracle的視圖不支援參數這裡有一個另類的方法,不是很好,但是還是一種解決方案通過package實現create or replace package pkg_pv is procedure set_pv(pv varchar2); function get_pv return varchar2; end; create or replace package body pkg_pv is v varchar2(20); procedure set_pv(pv varchar2)