How many tables are in my database

Question

I wanted to check how many tables I have so I ran the following query to list all of the tables in all of the tablespaces.
select t.table_name, df_name from dba_tables t, v$tablespace df
where t.tablespace_name = df.name;
I got back 34377 tables or records.
but if I wanted to count the number of tables I have I could run the following command.
SQL> select count(*) from dba_tables;
I got back 34700 tables.
Can anyone tell me why these numbers don't match or what I am missing here?

Answer 1

Also you can try to count them regarding to your tablespace which is better
SELECT COUNT(*),tablespace_name  FROM USER_TABLES group by tablespace_name;also Laurent Schnieder provide with way that you count your tables in specific schema like the following :
SQL> select
  2    table_name,
  3    to_number(
  4      extractvalue(
  5        xmltype(
  6     dbms_xmlgen.getxml('select count(*) c from '||table_name))
  7        ,'/ROWSET/ROW/C')) count
  8  from user_tables;http://www.dba-oracle.com/t_count_tables_schema.htm