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January 5, 2012 18:52
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calculating tables size in Oracle
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COLUMN TABLE_NAME FORMAT A32 | |
COLUMN OBJECT_NAME FORMAT A32 | |
COLUMN OWNER FORMAT A10 | |
SELECT | |
owner, table_name, TRUNC(sum(bytes)/1024/1024) Meg | |
FROM | |
(SELECT segment_name table_name, owner, bytes | |
FROM dba_segments | |
WHERE segment_type = 'TABLE' | |
UNION ALL | |
SELECT i.table_name, i.owner, s.bytes | |
FROM dba_indexes i, dba_segments s | |
WHERE s.segment_name = i.index_name | |
AND s.owner = i.owner | |
AND s.segment_type = 'INDEX' | |
UNION ALL | |
SELECT l.table_name, l.owner, s.bytes | |
FROM dba_lobs l, dba_segments s | |
WHERE s.segment_name = l.segment_name | |
AND s.owner = l.owner | |
AND s.segment_type = 'LOBSEGMENT' | |
UNION ALL | |
SELECT l.table_name, l.owner, s.bytes | |
FROM dba_lobs l, dba_segments s | |
WHERE s.segment_name = l.index_name | |
AND s.owner = l.owner | |
AND s.segment_type = 'LOBINDEX') | |
WHERE owner in UPPER('&owner') | |
GROUP BY table_name, owner | |
HAVING SUM(bytes)/1024/1024 > 10 /* Ignore really small tables */ | |
ORDER BY SUM(bytes) desc | |
; |
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select owner ||'.' || table_name as table_name, | |
round((num_rows * avg_row_len)/1024/1024,2) as MB, | |
initial_Extent | |
from all_tables | |
where blocks is not null and not owner in ('SYS', 'SYSTEM') | |
order by MB desc |
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select | |
round((t.num_rows * t.avg_row_len)/1024/1024,2) as MB, | |
round(((t.blocks - t.empty_blocks) * 8192)/1024/1024,2) as MB_BLOCKS, | |
t.num_rows as linhas, | |
'alter table ' ||t.owner || '.' || t.table_name || ' move storage(initial 64k next 64k pctincrease 0);' | |
from all_tables t | |
where t.blocks is not null and not owner in ('SYS', 'SYSTEM') | |
order by MB desc |
When I say count(*) it displays "204457898" records as count .... but when calculate_table_size_oracle.sql ... it gives number of rows as "185527835"... so your how to deciper this?
When I say count(*) it displays "204457898" records as count .... but when calculate_table_size_oracle.sql ... it gives number of rows as "185527835"... so your how to deciper this?
num_rows and avg_row_len - not real current values, but only stats that updated by 'ANALYZE TABLE your_table COMPUTE STATISTICS'.
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more informations,
http://stackoverflow.com/questions/264914/how-do-i-calculate-tables-size-in-oracle