How to lock the statistics in column level.

Question

Hi All, i am using 10.2.0.1.0 version of oracle.
I have gathered freuency histogram manually on one of my column of a table to provide more information to optimizer for better calculation of cardinality.
Now i have my weekend job runs for gathering stats on schema level with method_opt as 'For all column size repeat'. But i dont want the stats of above column to be overridden by the stats job. I dont want to lock the statistics of whole table, but i just want to lock the column level stats for this table.
how the above can be achieved?
Below is the details.
Code for manual histogram , i have eliminated many buckets purposely, as there are 194 buckets.
DECLARE
m_distcnt NUMBER := 916714;       -- num_distinct (As it is there in dba_tab_columns)
m_density NUMBER := 0.00000109031397771616;  -- density (As it is there in dba_tab_columns)
m_nullcnt NUMBER := 0;       -- num_nulls (As it is there in dba_tab_columns)
m_avgclen NUMBER := 8;       -- avg_col_len (As it is there in dba_tab_columns)
srec      dbms_stats.statrec;
n_array   dbms_stats.numarray;
BEGIN
  srec.epc := 3; -- no of end points
  n_array     := dbms_stats.numarray(3870     ,
                                             3891     ,
                                             3945     
  srec.bkvals := dbms_stats.numarray(25000     ,
                                             55000     ,
                                             100000     ,
  dbms_stats.prepare_column_values(srec, n_array);
  dbms_stats.set_column_stats('Schema1', 'USERS_HIST_TEST', 'COMPANYPK',
  distcnt => m_distcnt,
  density => m_density,
  nullcnt => m_nullcnt,
  srec    => srec,
  avgclen => m_avgclen,
  force => TRUE);
END;
-- Weekend job which will override above histogram
DBMS_STATS.GATHER_SCHEMA_STATS (
    ownname          => 'Schema1',
    estimate_percent => dbms_stats.auto_sample_size,
    block_sample     => FALSE,
    method_opt       => 'FOR ALL COLUMNS SIZE REPEAT',
    DEGREE           => dbms_stats.default_degree,
    granularity      => 'DEFAULT',
    CASCADE          => TRUE,
    options          => 'GATHER STALE'
Edited by: 930254 on Jul 4, 2012 9:08 AM

Answer 1

Pl do not post duplicate threads - How to  lock the statistics in column level.