Database Reference
In-Depth Information
Displaying Tablespace Size
DBAs often use monitoring scripts to alert them when they need to increase the space allocated to a tablespace.
Depending on whether or not you're in a pluggable database environment, your SQL for determining space usage will
vary. For a regular database (nonpluggable), you can use the regular DBA-level views to determine space usage. The
following script displays the percentage of free space left in a tablespace and data file:
SET PAGESIZE 100 LINES 132 ECHO OFF VERIFY OFF FEEDB OFF SPACE 1 TRIMSP ON
COMPUTE SUM OF a_byt t_byt f_byt ON REPORT
BREAK ON REPORT ON tablespace_name ON pf
COL tablespace_name FOR A17 TRU HEAD 'Tablespace|Name'
COL file_name FOR A40 TRU HEAD 'Filename'
COL a_byt FOR 9,990.999 HEAD 'Allocated|GB'
COL t_byt FOR 9,990.999 HEAD 'Current|Used GB'
COL f_byt FOR 9,990.999 HEAD 'Current|Free GB'
COL pct_free FOR 990.0 HEAD 'File %|Free'
COL pf FOR 990.0 HEAD 'Tbsp %|Free'
COL seq NOPRINT
DEFINE b_div=1073741824
--
SELECT 1 seq, b.tablespace_name, nvl(x.fs,0)/y.ap*100 pf, b.file_name file_name,
b.bytes/&&b_div a_byt, NVL((b.bytes-SUM(f.bytes))/&&b_div,b.bytes/&&b_div) t_byt,
NVL(SUM(f.bytes)/&&b_div,0) f_byt, NVL(SUM(f.bytes)/b.bytes*100,0) pct_free
FROM dba_free_space f, dba_data_files b
,(SELECT y.tablespace_name, SUM(y.bytes) fs
FROM dba_free_space y GROUP BY y.tablespace_name) x
,(SELECT x.tablespace_name, SUM(x.bytes) ap
FROM dba_data_files x GROUP BY x.tablespace_name) y
WHERE f.file_id(+) = b.file_id
AND x.tablespace_name(+) = y.tablespace_name
and y.tablespace_name = b.tablespace_name
AND f.tablespace_name(+) = b.tablespace_name
GROUP BY b.tablespace_name, nvl(x.fs,0)/y.ap*100, b.file_name, b.bytes
UNION
SELECT 2 seq, tablespace_name,
j.bf/k.bb*100 pf, b.name file_name, b.bytes/&&b_div a_byt,
a.bytes_used/&&b_div t_byt, a.bytes_free/&&b_div f_byt,
a.bytes_free/b.bytes*100 pct_free
FROM v$temp_space_header a, v$tempfile b
,(SELECT SUM(bytes_free) bf FROM v$temp_space_header) j
,(SELECT SUM(bytes) bb FROM v$tempfile) k
WHERE a.file_id = b.file#
ORDER BY 1,2,4,3;
If you don't have any monitoring in place, you're alerted via the SQL statement that is attempting to perform an
insert or update operation that the tablespace requires more space but isn't able to allocate more. At that point, an
ORA-01653
error is thrown, indicating the object can't extend.
After you determine that a tablespace needs more space, you need to either increase the size of a data file or add
a data file to the tablespace. See the section “Altering Tablespace Size,” later in this chapter, for a discussion of these
topics.
