执行下面的delete语句非常慢，要一个小时，有没有什么解决办法？DELETE FROM SOCIALINSURANCE@TZ_DBLINK T
WHERE EXISTS (SELECT 1
FROM CHECKBASE CB, CHECKRECORDS CR, CHECKGINSENG CG
WHERE CB.AAA004 = CR.AAA011
AND CB.AAA004 = CG.AAA011
AND CB.AAC003 = T.AAC003
AND CB.AAC002 = T.AAC002)复制代码同样的条件，做select语句大概20秒，为什么delete那么慢？
SELECT t.* FROM SOCIALINSURANCE@TZ_DBLINK T
WHERE EXISTS (SELECT 1
FROM CHECKBASE CB, CHECKRECORDS CR, CHECKGINSENG CG
WHERE CB.AAA004 = CR.AAA011
AND CB.AAA004 = CG.AAA011
AND CB.AAC003 = T.AAC003
AND CB.AAC002 = T.AAC002)复制代码
