out-of-date statistics - expected behavior?

If a table is monitored, 0 rows, collect stats, insert 100 rows < do not commit >, flush the pool followed, the show 100 inserted rows and dba_Tab_statistics STALE watch dba_tab_modifications = YES (as BLAND is based on lines changed as a percentage of 10% against the collected statistics)

Now, lines to restore the 100, drain the pool monitoring, we still see as obsolete statistics.   Is this expected behavior?   It simply means that the table will have its stats are gathered again in the next window of collection if this isn't really a problem but just so I know its expected.

SQL > drop table t1;

Deleted table.

SQL >

SQL > create table t1 select * from dba_objects where rownum = 0;

Table created.

SQL > exec dbms_stats.gather_table_stats (ownname = > user, tabname = > 'T1');

PL/SQL procedure successfully completed.

SQL >

SQL > SELECT table_name, num_rows, stale_stats OF SYS. DBA_TAB_STATISTICS where table_name = 'T1 ';

TABLE_NAME, NUM_ROWS STA

------------------------------ ---------- ---

T1                                      0 NO

SQL >

SQL > insert into t1

2 Select * from dba_objects

3 where rownum < 101;

100 rows created.

SQL >

SQL > execute DBMS_STATS. FLUSH_DATABASE_MONITORING_INFO;

PL/SQL procedure successfully completed.

-We can see that the lines were chosen as changed since we emptied the pool monitoring

SQL > select table_name, DBA_TAB_MODIFICATIONS inserts

2 where table_name = 'T1 '.

3;

TABLE_NAME INSERTS

------------------------------ ----------

T1                                    100

-the stats are now obsolete and

SQL > SELECT table_name, num_rows, stale_stats OF SYS. DBA_TAB_STATISTICS where table_name = 'T1 ';

TABLE_NAME, NUM_ROWS STA

------------------------------ ---------- ---

T1                                      0 YES

-Check the rows are in the table

SQL > select count (*) from t1;

COUNT (*)

----------

100

SQL > rollback;

Complete restoration.

-Check the lines are gone

SQL > select count (*) from t1;

COUNT (*)

----------

0

-Rinse the monitoring

SQL > execute DBMS_STATS. FLUSH_DATABASE_MONITORING_INFO;

PL/SQL procedure successfully completed.

SQL >

- but the tab_modifications and therefore statistics are still showing stale even if 100 inserts restored

SQL > select table_name, inserts, updates, deletes DBA_TAB_MODIFICATIONS

2 where table_name = 'T1 '.

3;

UPDATES OF INSERTIONS DELETIONS TABLE_NAME

------------------------------ ---------- ---------- ----------

T1                                    100          0          0

SQL >

SQL > SELECT table_name, num_rows, stale_stats OF SYS. DBA_TAB_STATISTICS where table_name = 'T1 ';

TABLE_NAME, NUM_ROWS STA

------------------------------ ---------- ---

T1                                      0 YES

SQL >

I think what you describe is a reasonable behavior.

When you run ROLLBACK, Oracle built more DML to reverse the effect of the previous DML and commits the batch as a single transaction. You can almost say that while SQL has a ROLLBACK command, Oracle does not work. It might be better if in your example DBA_TAB_MODIFICATIONS showed 100 insertions as well as 100 deletions.

Also, don't forget that there are more statistics than the number of rows. Scopes can have been allocated, high waters moved. The ROLLBACK will affect not the latter, so that they are definitely outdated.

Tags: Database

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