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select * from tab/dba_tables/dba_objects/cat;
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select table_name from user_tables; //µ±Ç°Óû§µÄ±í
select table_name from all_tables; //ËùÓÐÓû§µÄ±í
select table_name from dba_tables; //°üÀ¨ÏµÍ³±í
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select t.tablespace_name, round(sum(bytes/(1024*1024)),0) ts_size
from dba_tablespaces t, dba_data_files d
where t.tablespace_name = d.tablespace_name
group by t.tablespace_name;
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