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甘肃PON数据库分区列范围查询优化

时间：2017-03-13 19:20:32      阅读：290      评论：0      收藏：0      [点我收藏+]

标签：loop   压力   gety   sid   nes   between   stat   做了   语句   

查询慢的SQL：
    1. with p as(
    2.      select np.nodecode , np.nodename, d.deviceid, d.devicename, d.loopaddress, p.respara, p.rxcrcerror, p.txcrcerror
    3.      from   perf_t_ponport p,device d, node c,node np
    4.      where  p.resid = d.deviceid
    5.      and    d.nodecode = c.nodecode 
    6.      and    c.citynodecode = np.nodecode
    7.      and    c.nodecode in (SELECT S.NODECODE FROM SINGLEUSERNODEAUTH S WHERE S.NETUSERID = ‘admin‘ AND S.AUTHTYPE = ‘VIEW‘)
    8.      and    d.changetype = 0
    9.      and    p.coltime between trunc(sysdate-1,‘dd‘) and   trunc(sysdate,‘dd‘)
    10.      and    p.rxcrcerror is not null
    11.      and    p.rxcrcerror >0 
    12.     order by   p.rxcrcerror desc
    13. )
    14. select *
    15. from   p
    16. where rownum <=10
这个SQL执行花费了1分钟24秒，需要优化。


查看执行计划：
    1. SQL> explain plan for with p as(
    2.   2       select np.nodecode , np.nodename, d.deviceid, d.devicename, d.loopaddress, p.respara, p.rx
    3. crcerror, p.txcrcerror
    4.   3       from   perf_t_ponport p,device d, node c,node np
    5.   4       where  p.resid = d.deviceid
    6.   5       and    d.nodecode = c.nodecode 
    7.   6       and    c.citynodecode = np.nodecode
    8.   7       and    c.nodecode in (SELECT S.NODECODE FROM SINGLEUSERNODEAUTH S WHERE S.NETUSERID = ‘adm
    9. in‘ AND S.AUTHTYPE = ‘VIEW‘)
    10.   8       and    d.changetype = 0
    11.   9       and    p.coltime between trunc(sysdate-1,‘dd‘) and   trunc(sysdate,‘dd‘)
    12.  10       and    p.rxcrcerror is not null
    13.  11       and    p.rxcrcerror >0 
    14.  12      order by   p.rxcrcerror desc
    15.  13  )
    16.  14  select *
    17.  15  from   p
    18.  16  where rownum <=10
    19.  17  ;
    21. 已解释。
    23. SQL> select * from table(dbms_xplan.display);
    25. PLAN_TABLE_OUTPUT
    26. ----------------------------------------------------------------------------------------------------
    27. Plan hash value: 733587010
    29. ----------------------------------------------------------------------------------------------------
    30. | Id  | Operation                           | Name           | Rows  | Bytes | Cost (%CPU)| Time     | Pstart| Pstop |
    31. ----------------------------------------------------------------------------------------------------
    32. |   0 | SELECT STATEMENT                    |                |    10 |  3430 |  1125K (19)| 03:45:09 |       |       |
    33. |*  1 |  COUNT STOPKEY                      |                |       |       |            |          |       |       |
    34. |   2 |   VIEW                              |                |   133 | 45619 |  1125K (19)| 03:45:09 |       |       |
    35. |*  3 |    SORT ORDER BY STOPKEY            |                |   133 | 22743 |  1125K (19)| 03:45:09 |       |       |
    36. |*  4 |     FILTER                          |                |       |       |            |          |       |       |
    37. |*  5 |      HASH JOIN                      |                |   133 | 22743 |  1125K (19)| 03:45:09 |       |       |
    38. |*  6 |       HASH JOIN SEMI                |                |   133 | 19950 |  1125K (19)| 03:45:08 |       |       |
    39. |*  7 |        HASH JOIN                    |                |   219 | 28251 |  1125K (19)| 03:45:08 |       |       |
    40. |   8 |         NESTED LOOPS                |                |   219 | 25185 |  1125K (19)| 03:45:08 |       |       |
    41. |   9 |          PARTITION RANGE ITERATOR   |                |   219 | 10074 |  1125K (19)| 03:45:03 |   KEY |   KEY |
    42. |* 10 |           TABLE ACCESS FULL         | PERF_T_PONPORT |   219 | 10074 |  1125K (19)| 03:45:03 |   KEY |   KE
    43. |  11 |          TABLE ACCESS BY INDEX ROWID| DEVICE         |     1 |    69 |     2   (0)| 00:00:01 |       |     
    44. |* 12 |           INDEX UNIQUE SCAN         | PK_DEVICE      |     1 |       |     1   (0)| 00:00:01 |       |      
    45. |  13 |         TABLE ACCESS FULL           | NODE           |  1214 | 16996 |     8   (0)| 00:00:01 |       |       |
    46. |* 14 |        INDEX RANGE SCAN             | SYS_C00543203  |  1167 | 24507 |    10   (0)| 00:00:01 |       |
    47. |  15 |       TABLE ACCESS FULL             | NODE           |  1214 | 25494 |     8   (0)| 00:00:01 |       |      
    48. ----------------------------------------------------------------------------------------------------
    50. Predicate Information (identified by operation id):
    51. ---------------------------------------------------
    53.    1 - filter(ROWNUM<=10)
    54.    3 - filter(ROWNUM<=10)
    55.    4 - filter(TRUNC(SYSDATE@!-1,‘fmdd‘)<=TRUNC(SYSDATE@!,‘fmdd‘))
    56.    5 - access("C"."CITYNODECODE"="NP"."NODECODE")
    57.    6 - access("C"."NODECODE"="S"."NODECODE")
    58.    7 - access("D"."NODECODE"="C"."NODECODE")
    59.   10 - filter("P"."RXCRCERROR" IS NOT NULL AND "P"."RXCRCERROR">0 AND
    60.               "P"."COLTIME">=TRUNC(SYSDATE@!-1,‘fmdd‘) AND "P"."COLTIME"<=TRUNC(SYSDATE@!,‘fmdd‘))
    61.   12 - access("P"."RESID"="D"."DEVICEID" AND "D"."CHANGETYPE"=0)
    62.   14 - access("S"."NETUSERID"=‘admin‘ AND "S"."AUTHTYPE"=‘VIEW‘)
    64. 已选择36行。
查看执行计划：id为4的filter过滤条件为filter(TRUNC(SYSDATE@!-1,‘fmdd‘)<=TRUNC(SYSDATE@!,‘fmdd‘))。 查看id为9的执行计划访问分区的方式为：PARTITION RANGE ITERATOR。 说明分区表PERF_T_PONPORT的分区列的条件导致了性能压力。
coltime的列都是yyyy/mm/dd的格式，因此可以将PERF_T_PONPORT的分区列的条件条件改写为：(p.coltime =trunc(sysdate-1,‘dd‘) or p.coltime =trunc(sysdate,‘dd‘) )。

改写后的语句：
    1. with p as(
    2.      select  np.nodecode , np.nodename, d.deviceid, d.devicename, d.loopaddress, p.respara, p.rxcrcerror, p.txcrcerror
    3.      from   perf_t_ponport p,device d, node c,node np
    4.      where  p.resid = d.deviceid
    5.      and    d.nodecode = c.nodecode 
    6.      and    c.citynodecode = np.nodecode
    7.      and    d.changetype = 0
    8.      and  c.nodecode in (SELECT S.NODECODE FROM SINGLEUSERNODEAUTH S WHERE S.NETUSERID = ‘admin‘ AND S.AUTHTYPE = ‘VIEW‘)
    9.      and    (p.coltime =trunc(sysdate-1,‘dd‘) or p.coltime =trunc(sysdate,‘dd‘) )
    10.      and    p.rxcrcerror is not null
    11.      and    p.rxcrcerror >0 
    12.     order by   p.rxcrcerror desc
    13. )
    14. select *
    15. from   p
    16. where rownum <=10;

改写后的执行计划：
    1. SQL> explain plan for with p as(
    2.   2       select  np.nodecode , np.nodename, d.deviceid, d.devicename, d.loopaddress, p.respara, p.r
    3. xcrcerror, p.txcrcerror
    4.   3       from   perf_t_ponport p,device d, node c,node np
    5.   4       where  p.resid = d.deviceid
    6.   5       and    d.nodecode = c.nodecode 
    7.   6       and    c.citynodecode = np.nodecode
    8.   7       and    d.changetype = 0
    9.   8       and  c.nodecode in (SELECT S.NODECODE FROM SINGLEUSERNODEAUTH S WHERE S.NETUSERID = ‘admin
    10. ‘ AND S.AUTHTYPE = ‘VIEW‘)
    11.   9       and    (p.coltime =trunc(sysdate-1,‘dd‘) or p.coltime =trunc(sysdate,‘dd‘) )
    12.  10       and    p.rxcrcerror is not null
    13.  11       and    p.rxcrcerror >0 
    14.  12      order by   p.rxcrcerror desc
    15.  13  )
    16.  14  select *
    17.  15  from   p
    18.  16  where rownum <=10;
    20. 已解释。
    22. SQL> 
    23. SQL> select * from table(dbms_xplan.display);
    25. PLAN_TABLE_OUTPUT
    26. ----------------------------------------------------------------------------------------------------
    27. Plan hash value: 2287749996
    29. ----------------------------------------------------------------------------------------------------
    30. | Id  | Operation                          | Name           | Rows  | Bytes | Cost (%CPU)| Time     | Pstart| Pstop |
    31. ----------------------------------------------------------------------------------------------------
    32. |   0 | SELECT STATEMENT                   |                |    10 |  3430 |   915   (2)| 00:00:11 |       |       |
    33. |*  1 |  COUNT STOPKEY                     |                |       |       |            |          |       |       |
    34. |   2 |   VIEW                             |                |   266 | 91238 |   915   (2)| 00:00:11 |       |       |
    35. |*  3 |    SORT ORDER BY STOPKEY           |                |   266 | 45486 |   915   (2)| 00:00:11 |       |       |
    36. |*  4 |     HASH JOIN                      |                |   266 | 45486 |   915   (2)| 00:00:11 |       |       |
    37. |   5 |      TABLE ACCESS FULL             | NODE           |  1214 | 25494 |     8   (0)| 00:00:01 |       |       |
    38. |*  6 |      HASH JOIN RIGHT SEMI          |                |   267 | 40050 |   905   (2)| 00:00:11 |       |       |
    39. |*  7 |       INDEX RANGE SCAN             | SYS_C00543203  |  1167 | 24507 |    10   (0)| 00:00:01 |       |     
    40. |*  8 |       HASH JOIN                    |                |   437 | 56373 |   895   (2)| 00:00:11 |       |       |
    41. |   9 |        TABLE ACCESS FULL           | NODE           |  1214 | 16996 |     8   (0)| 00:00:01 |       |       |
    42. |  10 |        NESTED LOOPS                |                |   437 | 50255 |   885   (2)| 00:00:11 |       |       |
    43. |  11 |         PARTITION RANGE INLIST     |                |   437 | 20102 |     2   (0)| 00:00:01 |KEY(I) |KEY(I) |
    44. |* 12 |          TABLE ACCESS FULL         | PERF_T_PONPORT |   437 | 20102 |     2   (0)| 00:00:01 |KEY(I) |KEY(I) 
    45. |  13 |         TABLE ACCESS BY INDEX ROWID| DEVICE         |     1 |    69 |     2   (0)| 00:00:01 |       |       |
    46. |* 14 |          INDEX UNIQUE SCAN         | PK_DEVICE      |     1 |       |     1   (0)| 00:00:01 |       |       |
    47. ----------------------------------------------------------------------------------------------------
    49. Predicate Information (identified by operation id):
    50. ---------------------------------------------------
    52.    1 - filter(ROWNUM<=10)
    53.    3 - filter(ROWNUM<=10)
    54.    4 - access("C"."CITYNODECODE"="NP"."NODECODE")
    55.    6 - access("C"."NODECODE"="S"."NODECODE")
    56.    7 - access("S"."NETUSERID"=‘admin‘ AND "S"."AUTHTYPE"=‘VIEW‘)
    57.    8 - access("D"."NODECODE"="C"."NODECODE")
    58.   12 - filter("P"."RXCRCERROR" IS NOT NULL AND "P"."RXCRCERROR">0 AND
    59.               ("P"."COLTIME"=TRUNC(SYSDATE@!-1,‘fmdd‘) OR "P"."COLTIME"=TRUNC(SYSDATE@!,‘fmdd‘)))
    60.   14 - access("P"."RESID"="D"."DEVICEID" AND "D"."CHANGETYPE"=0)
    62. 已选择34行。

改写后， SQL执行花了9秒钟， 性能提升了9倍。改写后的SQL消除了filter， 访问分区的方式为 PARTITION RANGE INLIST 。

关于几种分区访问的方式：
范围分区：
1、PARTITION RANGE ITERATOR
    1. SQL> explain plan for select * from  perf_t_ponport p where p.coltime <trunc(sysdate,‘dd‘);
    3. 已解释。
    5. SQL> select * from table(dbms_xplan.display);
    7. PLAN_TABLE_OUTPUT
    8. ----------------------------------------------------------------------------------------------------
    9. Plan hash value: 4015217925
    11. ----------------------------------------------------------------------------------------------------
    12. | Id  | Operation                | Name           | Rows  | Bytes | Cost (%CPU)| Time     | Pstart| Pstop |
    13. ----------------------------------------------------------------------------------------------------
    14. |   0 | SELECT STATEMENT         |                |   100 |  4600 |     2   (0)| 00:00:01 |       |       |
    15. |   1 |  PARTITION RANGE ITERATOR|                |   100 |  4600 |     2   (0)| 00:00:01 |     1 |   KEY |
    16. |*  2 |   TABLE ACCESS FULL      | PERF_T_PONPORT |   100 |  4600 |     2   (0)| 00:00:01 |     1 |   KEY |
    17. ----------------------------------------------------------------------------------------------------
    19. Predicate Information (identified by operation id):
    20. ---------------------------------------------------
    22.    2 - filter("P"."COLTIME"<TRUNC(SYSDATE@!,‘fmdd‘))
    24. 已选择14行。

    1. SQL> explain plan for select * from  perf_t_ponport p where p.coltime > trunc(sysdate-1,‘dd‘) and p.
    2. coltime <trunc(sysdate,‘dd‘);
    4. 已解释。
    6. SQL> select * from table(dbms_xplan.display);
    8. PLAN_TABLE_OUTPUT
    9. ----------------------------------------------------------------------------------------------------
    10. Plan hash value: 1162550374
    12. ----------------------------------------------------------------------------------------------------
    13. | Id  | Operation                 | Name           | Rows  | Bytes | Cost (%CPU)| Time     | Pstart| Pstop |
    14. ----------------------------------------------------------------------------------------------------
    15. |   0 | SELECT STATEMENT          |                |   100 |  4600 |  1637  (37)| 00:00:20 |       |       |
    16. |*  1 |  FILTER                   |                |       |       |            |          |       |       |
    17. |   2 |   PARTITION RANGE ITERATOR|                |   100 |  4600 |  1637  (37)| 00:00:20 |   KEY |   KEY |
    18. |*  3 |    TABLE ACCESS FULL      | PERF_T_PONPORT |   100 |  4600 |  1637  (37)| 00:00:20 |   KEY |   
    19. ----------------------------------------------------------------------------------------------------
    21. Predicate Information (identified by operation id):
    22. ---------------------------------------------------
    24.    1 - filter(TRUNC(SYSDATE@!-1,‘fmdd‘)<TRUNC(SYSDATE@!,‘fmdd‘))
    25.    3 - filter("P"."COLTIME">TRUNC(SYSDATE@!-1,‘fmdd‘) AND "P"."COLTIME"<TRUNC(SYSDATE@!,‘fmdd‘))
    27. 已选择16行。

PARTITION RANGE ITERATOR是通过连续的分区迭代来获取数据。


2、PARTITION RANGE SINGLE
    1. SQL> explain plan for select * from  perf_t_ponport partition(P_20170307) p;
    3. 已解释。
    5. SQL> select * from table(dbms_xplan.display);
    7. PLAN_TABLE_OUTPUT
    8. ----------------------------------------------------------------------------------------------------
    9. Plan hash value: 1021280532
    11. ----------------------------------------------------------------------------------------------------
    12. | Id  | Operation              | Name           | Rows  | Bytes | Cost (%CPU)| Time     | Pstart| Pstop |
    13. ----------------------------------------------------------------------------------------------------
    14. |   0 | SELECT STATEMENT       |                |   100 |  4600 |     2   (0)| 00:00:01 |       |       |
    15. |   1 |  PARTITION RANGE SINGLE|                |   100 |  4600 |     2   (0)| 00:00:01 |    85 |    85 |
    16. |   2 |   TABLE ACCESS FULL    | PERF_T_PONPORT |   100 |  4600 |     2   (0)| 00:00:01 |    85 |   
    17. ----------------------------------------------------------------------------------------------------
    19. 已选择9行。


    1. SQL> explain plan for select * from  perf_t_ponport p where p.coltime = trunc(sysdate-1,‘dd‘) and p.
    2. coltime <trunc(sysdate,‘dd‘);
    4. 已解释。
    6. SQL> select * from table(dbms_xplan.display);
    8. PLAN_TABLE_OUTPUT
    9. ----------------------------------------------------------------------------------------------------
    10. Plan hash value: 506920385
    12. ----------------------------------------------------------------------------------------------------
    13. | Id  | Operation               | Name           | Rows  | Bytes | Cost (%CPU)| Time     | Pstart| Pstop |
    14. ----------------------------------------------------------------------------------------------------
    15. |   0 | SELECT STATEMENT        |                |   100 |  4600 |     8  (25)| 00:00:01 |       |       |
    16. |*  1 |  FILTER                 |                |       |       |            |          |       |       |
    17. |   2 |   PARTITION RANGE SINGLE|                |   100 |  4600 |     8  (25)| 00:00:01 |   KEY |   KEY |
    18. |*  3 |    TABLE ACCESS FULL    | PERF_T_PONPORT |   100 |  4600 |     8  (25)| 00:00:01 |   KEY |   KE
    19. ----------------------------------------------------------------------------------------------------
    21. Predicate Information (identified by operation id):
    22. ---------------------------------------------------
    24.    1 - filter(TRUNC(SYSDATE@!-1,‘fmdd‘)<TRUNC(SYSDATE@!,‘fmdd‘))
    25.    3 - filter("P"."COLTIME"=TRUNC(SYSDATE@!-1,‘fmdd‘) AND "P"."COLTIME"<TRUNC(SYSDATE@!,‘fmdd‘))
    27. 已选择16行。

PARTITION RANGE SINGLE只扫描一个分区。

3、PARTITION RANGE INLIST

    1. SQL> explain plan for select * from  perf_t_ponport p where p.coltime = trunc(sysdate-1,‘dd‘) or p.c
    2. oltime = trunc(sysdate,‘dd‘);
    4. 已解释。
    6. SQL> select * from table(dbms_xplan.display);
    8. PLAN_TABLE_OUTPUT
    9. ----------------------------------------------------------------------------------------------------
    10. Plan hash value: 2473962793
    12. ----------------------------------------------------------------------------------------------------
    13. | Id  | Operation              | Name           | Rows  | Bytes | Cost (%CPU)| Time     | Pstart| Pstop |
    14. ----------------------------------------------------------------------------------------------------
    15. |   0 | SELECT STATEMENT       |                |   100 |  4600 |     2   (0)| 00:00:01 |       |       |
    16. |   1 |  PARTITION RANGE INLIST|                |   100 |  4600 |     2   (0)| 00:00:01 |KEY(I) |KEY(I) |
    17. |*  2 |   TABLE ACCESS FULL    | PERF_T_PONPORT |   100 |  4600 |     2   (0)| 00:00:01 |KEY(I) |KEY(I)
    18. ----------------------------------------------------------------------------------------------------
    20. Predicate Information (identified by operation id):
    21. ---------------------------------------------------
    23.    2 - filter("P"."COLTIME"=TRUNC(SYSDATE@!-1,‘fmdd‘) OR "P"."COLTIME"=TRUNC(SYSDATE@!,‘fmdd‘))
    25. 已选择14行。

上面的KEY(I)就是KEY(INLIST)的意思。PARTITION RANGE INLIST无法通过Pstart和Pstop看出分区的起始和结束位置 。


4、ARTITION RANGE ALL和PARTITION RANGE OR
    1. SQL> explain plan for select * from  perf_t_ponport p where p.coltime >trunc(sysdate-1,‘dd‘) or  p.c
    2. oltime < trunc(sysdate-5,‘dd‘);
    4. 已解释。
    6. SQL> select * from table(dbms_xplan.display);
    8. PLAN_TABLE_OUTPUT
    9. ----------------------------------------------------------------------------------------------------
    10. Plan hash value: 3647984539
    12. ----------------------------------------------------------------------------------------------------
    13. | Id  | Operation           | Name           | Rows  | Bytes | Cost (%CPU)| Time     | Pstart| Pstop |
    14. ----------------------------------------------------------------------------------------------------
    15. |   0 | SELECT STATEMENT    |                |   100 |  4600 |     2   (0)| 00:00:01 |       |       |
    16. |   1 |  PARTITION RANGE ALL|                |   100 |  4600 |     2   (0)| 00:00:01 |     1 |   101 |
    17. |*  2 |   TABLE ACCESS FULL | PERF_T_PONPORT |   100 |  4600 |     2   (0)| 00:00:01 |     1 |   101 |
    18. ----------------------------------------------------------------------------------------------------
    20. Predicate Information (identified by operation id):
    21. ---------------------------------------------------
    23.    2 - filter("P"."COLTIME"<TRUNC(SYSDATE@!-5,‘fmdd‘) OR
    24.               "P"."COLTIME">TRUNC(SYSDATE@!-1,‘fmdd‘))
    26. 已选择15行。

ARTITION RANGE ALL是全分区扫描， 上面是在oracle 10g环境测试， 在Oracle 11g环境下，分区扫描方式为：PARTITION RANGE OR， 可以看出11g对这种分区查询条件扫描方式做了优化。
    1. SQL> explain plan for select * from  perf_t_ponport p where p.coltime >trunc(sysdate-1,‘dd‘) or  p.c
    2. oltime < trunc(sysdate-5,‘dd‘);
    4. 已解释。
    6. SQL> select * from table(dbms_xplan.display);
    8. PLAN_TABLE_OUTPUT
    9. ----------------------------------------------------------------------------------------------------
    10. Plan hash value: 470656424
    12. ----------------------------------------------------------------------------------------------------
    13. | Id  | Operation          | Name           | Rows  | Bytes | Cost (%CPU)| Time     | Pstart| Pstop |
    14. ----------------------------------------------------------------------------------------------------
    15. |   0 | SELECT STATEMENT   |                |  1512M|    67G|  3783K  (3)| 12:36:37 |       |       |
    16. |   1 |  PARTITION RANGE OR|                |  1512M|    67G|  3783K  (3)| 12:36:37 |KEY(OR)|KEY(OR)|
    17. |*  2 |   TABLE ACCESS FULL| PERF_T_PONPORT |  1512M|    67G|  3783K  (3)| 12:36:37 |KEY(OR)|KEY(OR)|
    18. ----------------------------------------------------------------------------------------------------
    20. Predicate Information (identified by operation id):
    21. ---------------------------------------------------
    23.    2 - filter("P"."COLTIME"<TRUNC(SYSDATE@!-5,‘fmdd‘) OR
    24.               "P"."COLTIME">TRUNC(SYSDATE@!-1,‘fmdd‘))
    26. Note
    27. -----
    28.    - ‘PLAN_TABLE‘ is old version
    30. 已选择19行。






甘肃PON数据库分区列范围查询优化

标签：loop   压力   gety   sid   nes   between   stat   做了   语句   

原文地址：http://www.cnblogs.com/xiaohe001/p/6544305.html
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