How to copy statistics of a partition to another??

Question

Hi,
I have a partitioned table (Oracle 9.2).
We will be creating new partitions for increasing data and I would like to copy the statistics of the existing partition for the newly created partition.
Whats the best way to do this?
Regards

Answer 1

Hi,
<br>
1. Create a table to hold statistics with <a href=CREATE_STAT_TABLE Procedure. <br>
2. Use EXPORT_TABLE_STATS Procedure to export a partition level stats.<br>
3. Update your own stattab (created in step 1) to change the partition name.<br>
4 Use IMPORT_TABLE_STATS Procedure to import stats into a partition.<br>
<br>
Here a simple example with a table stats level (but for partition, it's the same thing, verify which the column you need to update, where partition name is) :<br>
SQL> create table teststat (col number);
Table created.
--rows insert
SQL> select * from teststat;
       COL
         1
SQL> select num_rows from dba_tables where table_name = 'TESTSTAT'
SQL> /
  NUM_ROWS
SQL>  exec DBMS_STATS.GATHER_TABLE_STATS('SYSTEM','TESTSTAT')
PL/SQL procedure successfully completed.
SQL> select num_rows from dba_tables where table_name = 'TESTSTAT'
  2  /
  NUM_ROWS
         1
SQL> exec DBMS_STATS.CREATE_STAT_TABLE ('SYSTEM','MYSTATS')
PL/SQL procedure successfully completed.
SQL> desc mystats
Name                                      Null?    Type
STATID                                             VARCHAR2(30)
TYPE                                               CHAR(1)
VERSION                                            NUMBER
FLAGS                                              NUMBER
C1                                                 VARCHAR2(30)
C2                                                 VARCHAR2(30)
C3                                                 VARCHAR2(30)
C4                                                 VARCHAR2(30)
C5                                                 VARCHAR2(30)
N1                                                 NUMBER
N2                                                 NUMBER
N3                                                 NUMBER
N4                                                 NUMBER
N5                                                 NUMBER
N6                                                 NUMBER
N7                                                 NUMBER
N8                                                 NUMBER
N9                                                 NUMBER
N10                                                NUMBER
N11                                                NUMBER
N12                                                NUMBER
D1                                                 DATE
R1                                                 RAW(32)
R2                                                 RAW(32)
CH1                                                VARCHAR2(1000)
SQL> exec DBMS_STATS.EXPORT_TABLE_STATS ('SYSTEM','TESTSTAT',null,'MYSTATS')
PL/SQL procedure successfully completed.
SQL>
SQL> select c1 from mystats; --c1 for table name, verify where is partition name
C1
TESTSTAT
TESTSTAT
SQL> update mystats set c1 = 'TESTSTAT2' where c1 = 'TESTSTAT';
2 rows updated.
SQL> commit;
Commit complete.
SQL> create table TESTSTAT2 (col number);
Table created.
SQL> select * from teststat2;
no rows selected
SQL> select num_rows from dba_tables where table_name = 'TESTSTAT2'
SQL> /
  NUM_ROWS
SQL> exec DBMS_STATS.IMPORT_TABLE_STATS ('SYSTEM','TESTSTAT2',null,'MYSTATS')
PL/SQL procedure successfully completed.
SQL> select table_name,num_rows
from dba_tables
where table_name in ('TESTSTAT','TESTSTAT2');
TABLE_NAME                       NUM_ROWS
TESTSTAT                                1
TESTSTAT2                               1
SQL>
SQL> <br>
HTH,<br>
<br>
Nicolas.
Message was edited by: <br>
N. Gasparotto<br>
I change a little bit my example