Best way of partitioning the huge size table in oracle 11gr2

hi,
OS: linux
DB: oracle 11gR2
table size is about 2T and single table space with multiple dbf files in ASM,
table partition with dbms.redefinition is running past 2 days (range partition).. its running but not that fast..
note: exchange partition is too slow.. hence not used..
what is the best way of doing the huge size table partition. please suggest, thanks.

>
what is the best way of doing the huge size table partition
>
A few questions
1. Is that an OLTP or OLAP table?
2. Is all of the data still needed online or is some of it archivable?
3. What type of partitiioning are you doing? RANGE? LIST? COMPOSITE?
4. Why do you you say 'exchange partition is too slow' - did you do a test?
For example if data will be partitioned by create date then one stragety is to initially put all existing data into the root partition of a range partitioned table. Then you can start using new partitions for new incoming data and take your time to partition the current data.

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SELECT   au_subtyp1.au_id_k,
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                             WHERE au_subtyp1.create_ts =
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Explain Plan
Plan hash value: 2534321861
| Id | Operation                | Name      | Rows | Bytes |TempSpc| Cost (%CPU)| Time     |
|   0 | SELECT STATEMENT         |           |     1 |    91 |       | 33265   (2)| 00:06:40 |
|* 1 | FILTER                  |           |       |       |       |            |          |
|   2 |   HASH GROUP BY          |           |     1 |    91 |       | 33265   (2)| 00:06:40 |
|* 3 |    HASH JOIN             |           | 1404K|   121M|    19M| 33178   (1)| 00:06:39 |
|* 4 |     HASH JOIN            |           |   307K|    16M| 8712K| 23708   (1)| 00:04:45 |
|   5 |      VIEW                | VW_SQ_1   |   307K| 5104K|       | 13493   (1)| 00:02:42 |
|   6 |       HASH GROUP BY      |           |   307K|    13M|   191M| 13493   (1)| 00:02:42 |
|* 7 |        INDEX FULL SCAN   | AUSU_PK   | 2809K|   125M|       | 13493   (1)| 00:02:42 |
|* 8 |      INDEX FAST FULL SCAN| AUSU_PK   | 2809K|   104M|       | 2977   (2)| 00:00:36 |
|* 9 |     TABLE ACCESS FULL    | AU_SUBTYP | 1404K|    46M|       | 5336   (2)| 00:01:05 |
Predicate Information (identified by operation id):
   1 - filter("AU_SUBTYP1"."CREATE_TS"=MAX("AU_SUBTYP2"."CREATE_TS"))
   3 - access("AU_SUBTYP2"."AU_ID_K"="AU_SUBTYP1"."AU_ID_K")
   4 - access("AU_SUBTYP2"."EFF_DTE"="VW_COL_1" AND "AU_ID_K"="AU_SUBTYP2"."AU_ID_K")
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   8 - filter("AU_SUBTYP2"."CREATE_TS"<TIMESTAMP' 2013-01-01 00:00:00')
   9 - filter("AU_SUBTYP1"."EXISTS_FLG"='Y')Code 2:
I already raised a thread a week back and Dom suggested the following query, it is cost effective but the performance is same and used the same amount of Temp tablespace
select au_id_k,pgm_struct_id_k from (
SELECT au_id_k
      ,      pgm_struct_id_k
      ,      ROW_NUMBER() OVER (PARTITION BY au_id_k ORDER BY eff_dte DESC, create_ts DESC) rn,
      create_ts, eff_dte,exists_flg
      FROM   au_subtyp
      WHERE create_ts < TO_DATE('2013-01-01','YYYY-MM-DD')
      AND    eff_dte <= TO_DATE('2012-12-31','YYYY-MM-DD')
      ) d where rn =1   and exists_flg = 'Y'
--Explain Plan
Plan hash value: 4039566059
| Id | Operation                | Name      | Rows | Bytes |TempSpc| Cost (%CPU)| Time     |
|   0 | SELECT STATEMENT         |           | 2809K|   168M|       | 40034   (1)| 00:08:01 |
|* 1 | VIEW                    |           | 2809K|   168M|       | 40034   (1)| 00:08:01 |
|* 2 |   WINDOW SORT PUSHED RANK|           | 2809K|   133M|   365M| 40034   (1)| 00:08:01 |
|* 3 |    TABLE ACCESS FULL     | AU_SUBTYP | 2809K|   133M|       | 5345   (2)| 00:01:05 |
Predicate Information (identified by operation id):
   1 - filter("RN"=1 AND "EXISTS_FLG"='Y')
   2 - filter(ROW_NUMBER() OVER ( PARTITION BY "AU_ID_K" ORDER BY
              INTERNAL_FUNCTION("EFF_DTE") DESC ,INTERNAL_FUNCTION("CREATE_TS") DESC )<=1)
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              2012-12-31 00:00:00', 'syyyy-mm-dd hh24:mi:ss'))Thanks,
Vijay

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Thanks for your reply. I am running this on our Test environment as I don't want to run this on Production environment now. The test environment holds 2809605 records (2 Million).
The query output count is 281699 (2 Hundred Thousand) records and the selectivity is 0.099. The Distinct values of create_ts, eff_dte, and exists_flg is 2808905 records. I am sure the index scan is not going to help out much as you said.
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First Query...
CPU used by this session     4740
CPU used when call started     4740
Cached Commit SCN referenced     21393
DB time     4745
OS Involuntary context switches     467
OS Page reclaims     64253
OS System time used     26
OS User time used     4562
OS Voluntary context switches     16
SQL*Net roundtrips to/from client     9
bytes received via SQL*Net from client     2487
bytes sent via SQL*Net to client     15830
calls to get snapshot scn: kcmgss     37
consistent gets     52162
consistent gets - examination     2
consistent gets from cache     52162
enqueue releases     19
enqueue requests     19
enqueue waits     1
execute count     2
ges messages sent     1
global enqueue gets sync     19
global enqueue releases     19
index fast full scans (full)     1
index scans kdiixs1     1
no work - consistent read gets     52125
opened cursors cumulative     2
parse count (hard)     1
parse count (total)     2
parse time cpu     1
parse time elapsed     1
physical write IO requests     69
physical write bytes     17522688
physical write total IO requests     69
physical write total bytes     17522688
physical write total multi block requests     69
physical writes     2139
physical writes direct     2139
physical writes direct temporary tablespace     2139
physical writes non checkpoint     2139
recursive calls     19
recursive cpu usage     1
session cursor cache hits     1
session logical reads     52162
sorts (memory)     2
sorts (rows)     760
table scan blocks gotten     23856
table scan rows gotten     2809607
table scans (short tables)     1
user I/O wait time     1
user calls     11
workarea executions - onepass     1
workarea executions - optimal     9
Second Query
CPU used by this session     1197
CPU used when call started     1197
Cached Commit SCN referenced     21393
DB time     1201
OS Involuntary context switches     8684
OS Page reclaims     21769
OS System time used     14
OS User time used     1183
OS Voluntary context switches     50
SQL*Net roundtrips to/from client     9
bytes received via SQL*Net from client     767
bytes sent via SQL*Net to client     15745
calls to get snapshot scn: kcmgss     17
consistent gets     23871
consistent gets from cache     23871
db block gets     16
db block gets from cache     16
enqueue releases     25
enqueue requests     25
enqueue waits     1
execute count     2
free buffer requested     1
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global enqueue get time     1
global enqueue gets sync     25
global enqueue releases     25
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opened cursors cumulative     2
parse count (hard)     1
parse count (total)     2
parse time elapsed     1
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physical read bytes     6635520
physical read total IO requests     27
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physical read total multi block requests     27
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physical reads direct     810
physical reads direct temporary tablespace     810
physical write IO requests     117
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physical write total multi block requests     117
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physical writes direct     3001
physical writes direct temporary tablespace     3001
physical writes non checkpoint     3001
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session cursor cache hits     1
session logical reads     23887
sorts (disk)     1
sorts (memory)     2
sorts (rows)     2810365
table scan blocks gotten     23856
table scan rows gotten     2809607
table scans (short tables)     1
user I/O wait time     2
user calls     11
workarea executions - onepass     1
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Vijay
Edited by: Vijayaraghavan Krishnan on Nov 28, 2012 11:17 AM
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Best way of partitioning the huge size table in oracle 11gr2

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