Daafiles used and free space

Question

hii everybody,
i want to check the used and free space of all datafiles of my database(10.2.0.3),platform redhat 5.7 .
your help is highly appreciated thanks.
Edited by: 938946 on Dec 31, 2012 4:38 AM

Answer 1

938946 wrote:
can you please tell me why temp tablespace's %used is showing in negative.
(tablespace name)TEMP (size in MB)1100221 (Free in MB)48.375 (%Free)94 (%Used)-1913Without seeing what you actually have, I can only guess, but as I said, you have the aggregations messed up in both halves of your query.
The second half of your original query (below the UNION ALL) is the bit that calculates the space for the temp tablespace. It looks to me as if you have multiple files in your temp tablespace and that the files actually have at least two different sizes. This is from one of my databases the has that situation, and builds up to the query that you are using to get the temporary tablespace information.
The basic dba_temp_files query:
SQL> select tablespace_name, bytes
  2  from dba_temp_files;
TABLESPACE_NAME                     BYTES
TMP                            2146500608
TMP                            2146500608
TMP                            1072758784The basic v$temp_space_header query:
SQL> SELECT tablespace_name,bytes_free,bytes_used
  2  FROM v$temp_space_header;
TABLESPACE_NAME                BYTES_FREE BYTES_USED
TMP                                     0 2146500608
TMP                                     0 1072758784
TMP                                     0 2146500608Your query against v$temp_space_header
SQL> SELECT tablespace_name,bytes_free,bytes_used
  2  FROM v$temp_space_header
  3  GROUP BY tablespace_name,bytes_free,bytes_used;
TABLESPACE_NAME                BYTES_FREE BYTES_USED
TMP                                     0 1072758784
TMP                                     0 2146500608The basic join of your two queries without the aggregation. I added the file_id and bytes columns from dba_temp_files and the bytes_free and bytes_used columns from v$temp_space_header to make what is happening clearer.
SQL> SELECT df.tablespace_name tspace, fs.file_id, fs.bytes, df.bytes_free,
  2         df.bytes_used, fs.bytes / (1024 * 1024) bytes_mb,
  3         df.bytes_free / (1024 * 1024) bytes_free_mb,
  4         ((fs.bytes - df.bytes_used) * 100) / fs.bytes bytes_minus_used,
  5         ((fs.bytes - df.bytes_free) * 100) / fs.bytes bytes_minus_free
  6  FROM dba_temp_files fs,
  7       (SELECT tablespace_name,bytes_free,bytes_used
  8        FROM v$temp_space_header
  9        GROUP BY tablespace_name,bytes_free,bytes_used) df
10  WHERE fs.tablespace_name  = df.tablespace_name
11  ORDER BY 1, 3, 4, 5;
TSPACE        FILE_ID      BYTES BYTES_FREE BYTES_USED   BYTES_MB BYTES_FREE_MB BYTES_MINUS_USED BYTES_MINUS_FREE
TMP                 3 1072758784          0 1072758784  1023.0625             0                0              100  -- Group 1
TMP                 3 1072758784          0 2146500608  1023.0625             0       -100.09164              100  -- Group 2
TMP                 1 2146500608          0 1072758784  2047.0625             0       50.0228987              100  -- Group 3
TMP                 2 2146500608          0 1072758784  2047.0625             0       50.0228987              100  -- Group 3
TMP                 1 2146500608          0 2146500608  2047.0625             0                0              100  -- Group 4
TMP                 2 2146500608          0 2146500608  2047.0625             0                0              100  -- Group 4The comments at the end show which group the rows will fall into when they are aggregated. Now, if we do the math manually based on your query we get:
Group 1
   Bytes_mb = 1072758784/1024/1024 = 1023.0625
   Bytes_free_mb = 0/1024/1024 = 0
   pct_free = ((1072758784 - 1072758784)*100)/1072758784 = 0
   pct_used = ((1072758784 - 0)*100/100 = 100
Group 2
   Bytes_mb = 1072758784/1024/1024 = 1023.0625
   Bytes_free_mb = 0/1024/1024 = 0
   pct_free = (1072758784 - 2146500608)/1024/1024 = -100
   pct_used = (1072758784 - 0)/1024/1024 = 100
Group 3
   Bytes_mb = 2146500608/1024/1024 = 2047.0625
   Bytes_free_mb = SUM(0+0)/1024/1024 = 0
   pct_free = ((SUM(2146500608+2146500608) - 1072758784)*100)/2146500608 = 150
   pct_used = ((SUM(2146500608+2146500608) - 0)*100)/2146500608 = 200
Group 3
   Bytes_mb = 2146500608/1024/1024 = 2047.0625
   Bytes_free_mb = SUM(0+0)/1024/1024 = 0
   pct_free = ((SUM(2146500608+2146500608) - 2146500608)*100)/2146500608 = 100
   pct_used = ((SUM(2146500608+2146500608) - 0)*100)/2146500608 = 200and actually running the query:
SQL> SELECT df.tablespace_name tspace,
  2         fs.bytes / (1024 * 1024) bytes,
  3         SUM(df.bytes_free) / (1024 * 1024) bytes_free,
  4         Nvl(Round((SUM(fs.bytes) - df.bytes_used) * 100 / fs.bytes), 1) pct_free,
  5         Round((SUM(fs.bytes) - df.bytes_free) * 100 / fs.bytes) pct_used
  6  FROM dba_temp_files fs,
  7       (SELECT tablespace_name,bytes_free,bytes_used
  8        FROM v$temp_space_header
  9        GROUP BY tablespace_name,bytes_free,bytes_used) df
10  WHERE fs.tablespace_name  = df.tablespace_name
11  GROUP BY df.tablespace_name,fs.bytes,df.bytes_free,df.bytes_used
12  ORDER BY 4 DESC;
TSPACE          BYTES BYTES_FREE   PCT_FREE   PCT_USED
TMP         2047.0625          0        150        200  -- Group 3
TMP         2047.0625          0        100        200  -- Group 4
TMP         1023.0625          0          0        100  -- Group 1
TMP         1023.0625          0       -100        100  -- Group 2John