Oracle ten million data paging query optimization
1. Before unoptimized:
SELECT TMP.* FROM (SELECT ROWNUM AS "ROWNO",${tableId},
${columnName}
FROM ${tableName}) TMP
WHERE
TMP.ROWNO <= #{end}
AND TMP.ROWNO >= #{start}
2. After Optimization:
SELECT T1.${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
Reproduced in: https: //my.oschina.net/vright/blog/1543709