11g: global statistics, once done block statistics additional

This is a follow-up question 11g: additional statistics - effects of bad implementation

In a system, who should use additional statistics, global statistical imagined fault someone intentionally.

These aggregate statistics seems to stop to move to additional statistics.

As a special field table user_tab_col_statistics has to mean here.


See this demo program:

SET LINESIZE 130
set serveroutput on

call dbms_output.put_line('drop and re-create table ''T''...');

-- clean up
DROP TABLE t;

-- create a table with partitions and subpartitions
CREATE TABLE t (
  tracking_id       NUMBER(10),
  partition_key     DATE,
  subpartition_key  NUMBER(3),
  name              VARCHAR2(20 CHAR),
  status            NUMBER(1)
)
ENABLE ROW MOVEMENT
PARTITION BY RANGE(partition_key) SUBPARTITION BY HASH(subpartition_key)
SUBPARTITION TEMPLATE 4
(
  PARTITION P_DATE_TO_20160101 VALUES LESS THAN (to_date('2016-01-01', 'YYYY-MM-DD')),
  PARTITION P_DATE_TO_20160108 VALUES LESS THAN (to_date('2016-01-08', 'YYYY-MM-DD')),
  PARTITION P_DATE_TO_20160115 VALUES LESS THAN (to_date('2016-01-15', 'YYYY-MM-DD')),
  PARTITION P_DATE_OTHER VALUES LESS THAN (MAXVALUE)
);

CREATE UNIQUE INDEX t_pk ON t(partition_key, subpartition_key, tracking_id);

ALTER TABLE t ADD CONSTRAINT t_pk PRIMARY KEY(partition_key, subpartition_key, tracking_id);
ALTER TABLE t ADD CONSTRAINT t_partition_key_nn check (partition_key IS NOT NULL);
ALTER TABLE t ADD CONSTRAINT t_subpartition_key_nn check (subpartition_key IS NOT NULL);

call dbms_output.put_line('populate table ''T''...'); 

-- insert values into table (100 for first 2 partitions, last 2 remain empty)
BEGIN
  FOR i IN 1..100
  LOOP
    INSERT INTO t VALUES(i,to_date('2015-12-31', 'YYYY-MM-DD'), i, 'test' || to_char(i), MOD(i,4) );
  END LOOP;

  FOR i IN 101..200
  LOOP
    INSERT INTO t VALUES(i,to_date('2016-01-07', 'YYYY-MM-DD'), i, 'test2' || to_char(i), MOD(i, 4));
  END LOOP;
  commit;
END;
/

-- lock table stats, so that no automatic mechanism of Oracle can disturb us
call dbms_output.put_line('lock statistics for table ''T''...');

BEGIN
  dbms_stats.lock_table_stats(USER, 'T');
  commit;
END;
/

call dbms_output.put_line('delete statistics for table ''T''...');

-- make sure we have no table stats to begin with
BEGIN
  dbms_stats.delete_table_stats(
    ownname => USER,
    tabname => 'T',
    partname => NULL,
    cascade_columns => TRUE,
    cascade_indexes => TRUE,
    force => TRUE);
  commit;
END;
/

begin
  for rec in (select table_name, partition_name from user_tab_partitions where table_name = 'T')
  loop
    dbms_stats.delete_table_stats(
       ownname         => USER,
       tabname         => rec.table_name,
       partname        => rec.partition_name,
       cascade_columns => TRUE,
       cascade_indexes => TRUE,
       force           => TRUE);
 end loop;
 commit;
end;
/

call dbms_output.put_line('verify no data avail in user_tab_col_statistics for table ''T''...');

select table_name, column_name, to_char(last_analyzed, 'YYYY-MM-DD HH:MI:SS'), global_stats from user_tab_col_statistics where table_name = 'T';

call dbms_output.put_line('verify no data avail in user_part_col_statistics for table ''T''...');

-- not sure, if this is correct(?!):
select * from user_part_col_statistics where table_name = 'T' and not (num_distinct is null and low_value is null and high_value is null);

call dbms_output.put_line('''accidentally'' gather global stats in user_tab_col_statistics for table ''T''...');

begin
    dbms_stats.gather_table_stats(
      ownname => USER,
      tabname => 'T',
      partname => null,
      estimate_percent => 1,
      degree => 5,
      block_sample => TRUE,
      granularity => 'GLOBAL',
      cascade => TRUE,
      force => TRUE,
      method_opt => 'FOR ALL COLUMNS SIZE 1'
    );
end;
/

call dbms_output.put_line('verify global_stats in user_tab_col_statistics for table ''T''...');

select table_name, column_name, to_char(last_analyzed, 'YYYY-MM-DD HH:MI:SS'), global_stats from user_tab_col_statistics where table_name = 'T';

call dbms_output.put_line('wait 30 seconds...');

call dbms_lock.sleep(30); -- might require to grant access

call dbms_output.put_line('...done');

call dbms_output.put_line('try to update global_stats in user_tab_col_statistics for table ''T'' by partition level statistic updates...');

begin
  for rec in (select table_name, partition_name from user_tab_partitions where table_name = 'T')
  loop
    dbms_stats.gather_table_stats(
      ownname => USER,
      tabname => rec.table_name,
      partname => rec.partition_name,
      estimate_percent => 1,
      degree => 5,
      block_sample => TRUE,
      granularity => 'PARTITION',
      cascade => TRUE,
      force => TRUE,
      method_opt => 'FOR ALL COLUMNS SIZE 1'
    );
    dbms_stats.gather_table_stats(
      ownname => USER,
      tabname => rec.table_name,
      partname => rec.partition_name,
      estimate_percent => 1,
      degree => 5,
      block_sample => TRUE,
      granularity => 'SUBPARTITION',
      cascade => TRUE,
      force => TRUE,
      method_opt => 'FOR ALL COLUMNS SIZE 1');  
  end loop;
end;
/

call dbms_output.put_line('re-verify global_stats in user_tab_col_statistics for table ''T'' (check for last_analyzed and global_stats)...');

select table_name, column_name, to_char(last_analyzed, 'YYYY-MM-DD HH:MI:SS'), global_stats from user_tab_col_statistics where table_name = 'T';

Output:

Call completed.

drop and re-create table 'T'...


Table T dropped.


Table T created.


Unique index T_PK created.

Table T altered.


Table T altered.


Table T altered.


Call completed.

populate table 'T'...


PL/SQL procedure successfully completed.

Call completed.

lock statistics for table 'T'...


PL/SQL procedure successfully completed.


Call completed.

delete statistics for table 'T'...


PL/SQL procedure successfully completed.


PL/SQL procedure successfully completed.


Call completed.

verify no data avail in user_tab_col_statistics for table 'T'...


no rows selected



Call completed.

verify no data avail in user_part_col_statistics for table 'T'...


no rows selected


Call completed.

'accidentally' gather global stats in user_tab_col_statistics for table 'T'...


PL/SQL procedure successfully completed.


Call completed.

verify global_stats in user_tab_col_statistics for table 'T'...


TABLE_NAME                     COLUMN_NAME                    TO_CHAR(LAST_ANALYZ GLO
------------------------------ ------------------------------ ------------------- ---
T                              TRACKING_ID                    2016-01-28 02:09:31 YES
T                              PARTITION_KEY                  2016-01-28 02:09:31 YES
T                              SUBPARTITION_KEY               2016-01-28 02:09:31 YES
T                              NAME                           2016-01-28 02:09:31 YES
T                              STATUS                         2016-01-28 02:09:31 YES

Call completed.

wait 30 seconds...

Call completed.


Call completed.

...done


Call completed.

try to update global_stats in user_tab_col_statistics for table 'T' by partition level statistic updates...

PL/SQL procedure successfully completed.


Call completed.

re-verify global_stats in user_tab_col_statistics for table 'T' (check for last_analyzed and global_stats)...


TABLE_NAME                     COLUMN_NAME                    TO_CHAR(LAST_ANALYZ GLO
------------------------------ ------------------------------ ------------------- ---
T                              TRACKING_ID                    2016-01-28 02:09:31 YES
T                              PARTITION_KEY                  2016-01-28 02:09:31 YES
T                              SUBPARTITION_KEY               2016-01-28 02:09:31 YES
T                              NAME                           2016-01-28 02:09:31 YES
T                              STATUS                         2016-01-28 02:09:31 YES

seems that the solution is to use the parameter cascade_parts-the online of FALSE:

begin
  dbms_stats.delete_table_stats(
    ownname => USER,
    tabname => 'T',
    partname => NULL,
    cascade_parts => FALSE, -- this is important
    cascade_columns => TRUE,
    cascade_indexes => TRUE,
    force => TRUE);
end;

Tags: Database

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