Introduction
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.
- What is Oracle SQL Tablespace?
An overview of tablespaces in Oracle databases, explaining their purpose and types. - How to Query Oracle Tablespace?
Basic SQL queries to retrieve information about tablespaces, including size and contents. - Check Tablespace Usage Percentage in Oracle
Methods to calculate the usage percentage of tablespaces to monitor efficiency and plan for scaling. - 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
FROM
( SELECT tablespace_name, bytes FROM dba_data_files
UNION ALL
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
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,
ddf.autoextensible,
DECODE (dt.bigfile,'NO','SMALL','YES','BIG') AS BIG_SMALL_FILE,
dt.block_size block_size
FROM
(SELECT tablespace_name, file_name, bytes,autoextensible FROM dba_data_files
UNION
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
TABLESPACE_NAME
--------------------
PLACEMENT_DIRECTORY
------------------------------------------------------------------------------------------------------------------------------------
FILE_NAME MB AUTOEXTEN BIG_SMALL_FILE BLOCK_SIZE
---------------------------------------------------------------------- ---------------- --------- --------------- ----------
SYSTEM
/mnt_nfs/dbdata/mydata
system02.dbf 2,048 NO SMALL 9192
Conclusion
Through the article, you can “Check the Oracle query