Oracle千萬級資料分頁查詢優化

1. 未優化之前：

SELECT TMP.* FROM (SELECT ROWNUM AS "ROWNO",${tableId},${columnName}
            FROM ${tableName}) TMP
            WHERE
                TMP.ROWNO <= #{end}
                AND TMP.ROWNO >= #{start}

2.優化之後：

SELECT T1.${tableId},T1.${columnName}
FROM ${tableName} T1,(SELECT RID
                       FROM (SELECT
                               ROWNUM RN,T.RID
                             FROM (SELECT
                                     ROWID RID
                                   FROM ${tableName}
                                  ) T
                             WHERE ROWNUM <= #{END})
                       WHERE RN > #{START}) T2
WHERE T1.ROWID = T2.RID

 

轉載於:https://my.oschina.net/vright/blog/1543709