Mastering Oracle query tablespace: A Comprehensive Guide for DBAs


How do I use the Oracle query tablespace? you’ll learn how to efficiently query Oracle tablespaces using SQL commands. The guide covers essential techniques for monitoring tablespace size, available space, and differentiating between various types of tablespaces. This practical approach aims to enhance database management skills for Oracle administrators.

  1. What is Oracle SQL Tablespace?
    An overview of tablespaces in Oracle databases, explaining their purpose and types.
  2. How to Query Oracle Tablespace?
    Basic SQL queries to retrieve information about tablespaces, including size and contents.
  3. Check Tablespace Usage Percentage in Oracle
    Methods to calculate the usage percentage of tablespaces to monitor efficiency and plan for scaling.
  4. Oracle Query Tablespace Usage
    Advanced querying techniques to analyze tablespaces’ performance and optimize storage management.

Step-by-Step Guide to Oracle Query Tablespace

How does a query check tablespace size, free space, and Big file vs small file SYSTEM tablespace? The following statement is below

SELECT tablespace_name,
  SUM(bytes)/1024/1024 AS mb
  ( SELECT tablespace_name, bytes FROM dba_data_files
  SELECT tablespace_name,bytes FROM dba_temp_files
WHERE tablespace_name='SYSTEM'
GROUP BY tablespace_name;

The screen output terminal

TABLESPACE_NAME                    MB
-------------------- ----------------
SYSTEM                          2,048

To query tablespace “SIZE, AUTO EXTEND, BIG_SMALL_FILE, BLOCK_SIZE” in Oracle.

SELECT dt.tablespace_name tablespace_name,
  SUBSTR(ddf.file_name,0, instr(ddf.file_name, '/', -1, 1) - 1) AS placement_directory,
  SUBSTR(ddf.file_name, instr(ddf.file_name, '/',   -1, 1) + 1) AS file_name,
  ddf.bytes                                         /1024/1024  AS mb,
  dt.block_size block_size
  (SELECT tablespace_name, file_name, bytes,autoextensible FROM dba_data_files
  SELECT tablespace_name, file_name, bytes,autoextensible FROM dba_temp_files
  ) ddf,
  (SELECT tablespace_name, block_size,bigfile FROM dba_tablespaces
  ) dt
WHERE dt.tablespace_name = ddf.tablespace_name
AND dt.tablespace_name   = 'SYSTEM';

The screen output terminal

FILE_NAME                                                                            MB AUTOEXTEN BIG_SMALL_FILE  BLOCK_SIZE
---------------------------------------------------------------------- ---------------- --------- --------------- ----------
system02.dbf                                                                      2,048 NO        SMALL                 9192
Mastering Oracle query tablespace: A Comprehensive Guide for DBAs


Through the article, you can “Check the Oracle query tablespace
for SIZE, AUTO EXTEND BIG_SMALL_FILE BLOCK_SIZE” as above. I hope will this your helpful. Thank you for reading the DevopsRoles page!

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My name is Huu. I love technology and especially Devops Skill such as Docker, vagrant, git so forth. I likes open-sources. so I created site to share the knowledge that I have learned. My Job: IT system administrator. Hobbies: summoners war game, gossip.
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