SQL

show all tables in oracle

SELECT * FROM USER_TABLES;		-- Tables from connected schema
SELECT * FROM ALL_TABLES;		-- Tables available to connected schema
	SELECT * FROM ALL_TABLES WHERE OWNER = 'SCHEMA_NAME';
	SELECT * FROM ALL_TABLES WHERE TABLE_NAME = 'TABLE_NAME';
SELECT * FROM DBA_TABLES;		-- All database Tables

show all tables in oracle

SELECT * FROM ALL_TABLES;

show tables in schema oracle

SELECT TABLE_NAME FROM ALL_TABLES WHERE OWNER = 'SCHEMA_NAME';
--GET TABLE NAMES OF A SCHEMA IN ORACLE

show tablespace oracle

Select t.tablespace_name  "Tablespace",  t.status "Status",  
    ROUND(MAX(d.bytes)/1024/1024,2) "MB Size",
    ROUND((MAX(d.bytes)/1024/1024) - 
    (SUM(decode(f.bytes, NULL,0, f.bytes))/1024/1024),2) "MB Used",   
    ROUND(SUM(decode(f.bytes, NULL,0, f.bytes))/1024/1024,2) "MB Free", 
    t.pct_increase "% increase", 
    SUBSTR(d.file_name,1,80) "File"  
FROM DBA_FREE_SPACE f, DBA_DATA_FILES d,  DBA_TABLESPACES t  
WHERE t.tablespace_name = d.tablespace_name  AND 
    f.tablespace_name(+) = d.tablespace_name    
    AND f.file_id(+) = d.file_id GROUP BY t.tablespace_name,   
    d.file_name,   t.pct_increase, t.status ORDER BY 1,3 DESC