Does renaming table require rerunning stats?

OS: OEL (latest) 64-bit
DB: 11gR1
I need to create a copy of a large table A in production (call the new table B). The data is the same but the physical layout of the tables is different (different partitioning scheme is being used between table A and B).
When I go to move table B to replace table A (which will eventually be dropped), do I have to rerun stats on table B?
That is,
(1) table A become table A_OLD
(2) table B becomes table A
Do I need to rerun stats on table A in step (2)? Is there anything else that needs to be done?
( I am doing this to limit the impact to the GUI which uses this table -- the final table name does not change so the GUI should not be affected.)
Cheers!

user601798 wrote:
Yes, do I need to rerun stats on the 'new' table A even though it has the same data and name (after rename) but different partitioning scheme (physical model)? It seems to me that the answer would be 'Yes'.
Otherwise, does not the optimizer fail to recognize the new partitioning?
(1) table Toys (all data present) and table Toys_New (empty)
(2) table Toys_New is loaded with table Toys data (both tables now have same data -- only difference is partitioning)
(2) table Toys is renamed table Toys_Old (will purge this at a later time)
(4) table Toys_New is renamed table Toys
And I was just thinking -- forgot to mention firsthand -- Toys_New will have the same indexes but of course the indexes will have unique names from those on Toys (to avoid 'object already exist' errors.
Given that last note I am more than convinced that stats needs to be run on Toys_New after step (4)
Cheers!Yes, you need to.
Your new table's name is "Toys" but this new table is totally different table than old Toys. So you need to analyze table again.
Regards
Gokhan

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Edited by: user11117178 on Jul 30, 2009 6:22 AM
Edited by: user11117178 on Jul 30, 2009 6:23 AM
Edited by: user11117178 on Jul 30, 2009 6:24 AM

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Plan hash value: 2132048964
| Id | Operation                     | Name                    | Rows | Bytes | Cost (%CPU)| Time     | Pstart| Pstop |
|   0 | SELECT STATEMENT              |                         |   324K|    33M| 3138   (5)| 00:00:38 |       |       |
|* 1 | HASH JOIN                    |                         |   324K|    33M| 3138   (5)| 00:00:38 |       |       |
|   2 |   BITMAP CONVERSION TO ROWIDS |                         |     3 |     9 |     1   (0)| 00:00:01 |       |       |
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|   4 |   PARTITION RANGE ITERATOR    |                         |   866K|    87M| 3121   (4)| 00:00:38 |   154 |   158 |
|   5 |    TABLE ACCESS FULL          | PS2_FS_TRANSACTION_FACT |   866K|    87M| 3121   (4)| 00:00:38 |   154 |   158 |
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Table Scan                                                       AGENT_STATE                                                2.366666667
Table Scan                                                       AGENT_STATE                                                0.3666666667
Table Scan                                                       AGENT_STATE                                                1.633333333
Table Scan                                                       AGENT_STATE                                                       0.75
Table Scan                                                       AGENT_STATE                                                1.866666667
Table Scan                                                       AGENT_STATE                                                2.533333333
Table Scan                                                       AGENT_STATE                                                0.5333333333
Table Scan                                                       AGENT_STATE                                                       1.95
Table Scan                                                       AGENT_STATE                                                        0.8
Table Scan                                                       AGENT_STATE                                                0.2833333333
Table Scan                                                       AGENT_STATE                                                1.983333333
Table Scan                                                       AGENT_STATE                                                        2.5
Table Scan                                                       AGENT_STATE                                                1.866666667
Table Scan                                                       AGENT_STATE                                                1.883333333
Table Scan                                                       AGENT_STATE                                                        0.9
Table Scan                                                       AGENT_STATE                                                2.366666667
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PLAN_TABLE_OUTPUT
Plan hash value: 1946142815
| Id | Operation                   | Name            | Rows | Bytes | Cost (%C
PU)| Time     |
PLAN_TABLE_OUTPUT
|   0 | SELECT STATEMENT            |                 |     1 |   106 |   244
(0)| 00:00:03 |
|* 1 | TABLE ACCESS BY INDEX ROWID| AGENT_STATE     |     1 |   106 |   244
(0)| 00:00:03 |
|* 2 |   INDEX RANGE SCAN          | AGENT_STATE_IDX |   229 |       |     4
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Hi,
But I am not getting what is the issue..its a simple select query and index is there on one of the leading columns (VZ_ID --- PK). Explain plan says its using its using Index and it only select fraction of rows from the table. Then why it is doing FTS. For Optimizer, why its like a query doing FTS.
The rule-based optimizer would have picked the plan with the index. The cost-based optimizer, however, is picking the plan with the lowest cost. Apparently, the lowest cost plan is the one with the full table scan. And the optimizer isn't necessarily wrong about this.
Reading data from a table via index probes is only efficient when selecting a relatively small percentage of rows. For larger percentages, a full table scan is generally better.
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Best regards,
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ur_file := UTL_FILE.FOPEN ('&directory', '&filename', 'r') ;
utl_file.get_line(ur_file, my_result);
dbms_output.put_line(my_result);
utl_file.fclose(ur_file);
end;
make sure u have an entry in ur init.ora saying that your
utl_file_dir = '\your directory where ur files reside'
cheers!
[email protected]

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