How can i check how many tables are in my database?

Hi Guyz,
If any body can tell how can i check how any and which tables are in my database.how big are they.and who are the owners.
Thanx in advance,
Navneet Kaur

hi,
how any and which tables.select count(*) from dba_tables;
how big are they.and who are the owners.select a.owners,a.table_name,sum(b.bytes)/1024/1024/1024 from dba_tables a, dba_segments b
where a.table_name=b.segment_name
group by a.owner
regards
Jafar

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