今天开发问我一个问题,PL/SQL很快出结果了,为什么应用还是很慢
create index F_AGT_SAVB_ACCTINFO_H_idx4 on F_AGT_SAVB_ACCTINFO_H
(agmt_id,last_trans_date,acct_bal,start_dt,end_dt,acct_status);
SQL> select agmt_id, max(last_trans_date) last_trans_date, sum(acct_bal) acct_bal
from dwf.F_AGT_SAVB_ACCTINFO_H
where start_dt <= to_date('2014-03-31', 'YYYY-MM-DD')
and end_dt > to_date('2014-03-31', 'YYYY-MM-DD')
and acct_status <> '1'
group by agmt_id; 2 3 4 5 6
596497 rows selected.
Execution Plan
----------------------------------------------------------
Plan hash value: 1288393334
------------------------------------------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes |TempSpc| Cost (%CPU)| Time |
------------------------------------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 698K| 34M| | 44078 (1)| 00:08:49 |
| 1 | HASH GROUP BY | | 698K| 34M| 65M| 44078 (1)| 00:08:49 |
|* 2 | INDEX FAST FULL SCAN| F_AGT_SAVB_ACCTINFO_H_IDX4 | 1010K| 50M| | 33677 (1)| 00:06:45 |
------------------------------------------------------------------------------------------------------------
Predicate Information (identified by operation id):
---------------------------------------------------
2 - filter("END_DT">TO_DATE(' 2014-03-31 00:00:00', 'syyyy-mm-dd hh24:mi:ss') AND
"ACCT_STATUS"<>'1' AND "START_DT"<=TO_DATE(' 2014-03-31 00:00:00', 'syyyy-mm-dd hh24:mi:ss'))
Statistics
----------------------------------------------------------
0 recursive calls
0 db block gets
124565 consistent gets
0 physical reads
0 redo size
27208221 bytes sent via SQL*Net to client
437946 bytes received via SQL*Net from client
39768 SQL*Net roundtrips to/from client
0 sorts (memory)
0 sorts (disk)
596497 rows processed
走INDEX FAST FULL SCAN 需要3S出结果
走INDEX FULL SCAN :
create index F_AGT_SAVB_ACCTINFO_H_idx4 on F_AGT_SAVB_ACCTINFO_H(agmt_id,last_trans_date,acct_bal);
Execution Plan
----------------------------------------------------------
Plan hash value: 2644626439
-----------------------------------------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
-----------------------------------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 698K| 34M| 14M (1)| 47:22:11 |
| 1 | SORT GROUP BY NOSORT | | 698K| 34M| 14M (1)| 47:22:11 |
|* 2 | TABLE ACCESS BY INDEX ROWID| F_AGT_SAVB_ACCTINFO_H | 1010K| 50M| 14M (1)| 47:22:11 |
| 3 | INDEX FULL SCAN | F_AGT_SAVB_ACCTINFO_H_IDX4 | 14M| | 88373 (1)| 00:17:41 |
-----------------------------------------------------------------------------------------------------------
Predicate Information (identified by operation id):
---------------------------------------------------
2 - filter("END_DT">TO_DATE(' 2014-03-31 00:00:00', 'syyyy-mm-dd hh24:mi:ss') AND
"ACCT_STATUS"<>'1' AND "START_DT"<=TO_DATE(' 2014-03-31 00:00:00', 'syyyy-mm-dd hh24:mi:ss'))
Statistics
----------------------------------------------------------
1 recursive calls
0 db block gets
14247288 consistent gets
1189251 physical reads
0 redo size
28157922 bytes sent via SQL*Net to client
437946 bytes received via SQL*Net from client
39768 SQL*Net roundtrips to/from client
0 sorts (memory)
0 sorts (disk)
596497 rows processed
select /*+ index(F_AGT_SAVB_ACCTINFO_H F_AGT_SAVB_ACCTINFO_H_idx4)*/ agmt_id, max(last_trans_date) last_trans_date,
sum(acct_bal) acct_bal
from dwf.F_AGT_SAVB_ACCTINFO_H
where start_dt <= to_date('2014-03-31', 'YYYY-MM-DD')
and end_dt > to_date('2014-03-31', 'YYYY-MM-DD')
and acct_status <> '1'
group by agmt_id;
但是这个SQL 出结果确是0.几秒
总结:PL/SQL这个工具坑爹,出结果快慢和SQL块慢没必然联系
