SELECT tablespace_name, sum ( blocks ) as free_blk , trunc ( sum ( bytes ) /(1024*1024) ) as free_m,
max( bytes ) / (1024) as big_chunk_k, count (*) as num_chunks
FROM dba_free_space GROUP BY tablespace_nam
2、check free, pct_free, and allocated space within a tablespace
SELECT tablespace_name, max_blocks, count_blocks, sum_free_blocks,
to_char(100*sum_free_blocks/sum_alloc_blocks, '99.99') || '%'AS pct_free FROM
( SELECT tablespace_name, sum(blocks) AS sum_alloc_blocks FROM dba_data_files GROUP BY tablespace_name), ( SELECT tablespace_name AS fs_ts_name, max(blocks) AS max_blocks
, count(blocks) AS count_blocks, sum(blocks) AS sum_free_blocks FROM dba_free_space
GROUP BY tablespace_name )WHERE tablespace_name =fs_ts_name
3、To analyze tables and indexe
BEGIN
dbms_utility.analyze_schema ( '&OWNER', 'ESTIMATE', NULL, 5 ) ;
END ;[@more@]
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