Cann't able to see the num_rows in dba_tables for the particular schems's

Question

Hi ,
I am getting confusion when i chked in dba_tables,but when i chk in the schema getting rows.can any one help on this. Thanks!!
SQL> select table_name,num_rows from dba_tables where owner like 'ORCL';
TABLE_NAME NUM_ROWS
AUDITTRAIL
SQL> conn orcl@XE
Enter password:
Connected.
SQL> select count(*) from AUDITTRAIL;
COUNT(*)
20974

Answer 1

Hi
Use DBMS_STATS package to view and modify optimizer statistics gathered for database objects.
exec dbms_stats.gather_table_stats(ownname=>'SYS',tabname=>'ORCL',estimate_percent=>30,method_opt=>'FOR ALL COLUMNS SIZE 1',degree=>4)
THEN
select table_name,num_rows from dba_tables where owner like 'ORCL';