Disable the automatic optimizer statistics

Hello

I wanted to request user_tab_modifications track, the number of rows updated in a week. Because this view is updated automatically when the automatic optimizer statistics collects statistics, I have disabled the automatic optimizer statistics. Now, I will carry out run dbms_stats. FLUSH_DATABASE_MONITORING_INFO(); manually to get the full view with the number of rows updated.

My concern here is, I get the exact number of rows updated per week of user_tab_modifications in doing this? Also, is there anything that is also updated from this point of view outside of optimizer statistics that are collected on a table.

Thank you

You might try to write a few PLSQL yourself.

What:

SQL> create table count_X_updates (update_count number);

Table created.

SQL> insert into count_X_updates values (0);

1 row created.

SQL> commit;

Commit complete.

SQL>
SQL> create table X (col_1 varchar2(5), col_2 varchar2(5), col_3 number);

Table created.

SQL> insert into X values ('a','first',1);

1 row created.

SQL> commit;

Commit complete.

SQL>

SQL> create or replace trigger count_x_updates_trg
  2  after update of col_1,col_2,col_3
  3  on X
  4  for each row
  5  declare prev_cnt number;
  6  begin
  7  update count_X_updates set update_count = update_count+1;
  8* end;
SQL> /

Trigger created.

SQL>  update x set col_1 = 'b', col_2='secnd',col_3=2;

1 row updated.

SQL> commit;

Commit complete.

SQL> select * from count_X_updates;

UPDATE_COUNT
------------
           1

SQL>  update x set col_1 = 'c' where col_3=2;

1 row updated.

SQL> commit;

Commit complete.

SQL> select * from count_X_updates;

UPDATE_COUNT
------------
           2

SQL> select * from x;

COL_1 COL_2      COL_3
----- ----- ----------
c     secnd          2

SQL>

Note: This trigger code must be improved because
a. several sessions could obtain the same value
b. it introduced a serialization - several session waiting on a lock on the count_X_updates of the table line - effectively, which means that all other sessions to try to update X will wait (even if they are to be updated lines X) until each previous emits a COMMIT.

Thus, this demo code is only to show you the PLSQL triggers. But may not be used in Production.

Practice some PLSQL. Learn about the autonomous operations.

Hemant K Collette

Tags: Database

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