Number of Tables by their Size in Oracle Database

Here I am giving an example to find out number of tables by their size (Bytes, KB, MB, GB and TB) in oracle database.

Query 1: [Bytes] Number of all tables accessible to the current user in Oracle database by their size grouped into predefined intervals.

SELECT size_interval,

       count(*) AS no_of_tables

  FROM (SELECT DATA.segment_name table_name,

              CASE

               WHEN DATA.bytes > 1000000000

               THEN '1b Bytes and more'

               WHEN DATA.bytes > 1000000

               THEN '1m - 1b Bytes'

               WHEN DATA.bytes > 1000

               THEN '1k - 1m Bytes'

               WHEN DATA.bytes > 100

               THEN '100 - 1k Bytes'

               WHEN DATA.bytes > 10

               THEN '10 - 100 Bytes'

               ELSE '0 - 10 Bytes'

              END AS size_interval

        FROM (SELECT us.segment_name,

                     sum(us.bytes) bytes

                FROM sys.user_segments us,

                     sys.all_tables at

               WHERE at.table_name = us.segment_name

                 AND us.segment_type = 'TABLE'

                  -- excluding some Oracle maintained schemas 

                 AND AT.owner NOT IN ('ANONYMOUS','CTXSYS',

                                      'DBSNMP','EXFSYS', 

                                      'LBACSYS', 'MDSYS', 

                                      'MGMT_VIEW','OLAPSYS', 

                                      'OWBSYS','ORDPLUGINS', 

                                      'ORDSYS', 'SI_INFORMTN_SCHEMA', 

                                      'SYS','SYSMAN',

                                      'SYSTEM', 'TSMSYS',

                                      'DIP', 'WKPROXY',

                                      'WMSYS','XDB',

                                      'APEX_040000', 'APEX_PUBLIC_USER', 

                                      'FLOWS_30000','FLOWS_FILES', 

                                      'MDDATA', 'ORACLE_OCM', 

                                      'XS$NULL', 'SPATIAL_CSW_ADMIN_USR', 

                                      'SPATIAL_WFS_ADMIN_USR', 'PUBLIC', 

                                      'WK_TEST','WKSYS', 'OUTLN')

               GROUP BY us.segment_name

             ) DATA)

       GROUP BY size_interval

       ORDER BY size_interval;

Output:

Fig 1: No. of tables by Bytes

Query 2: [Kilo Bytes] Number of all tables accessible to the current user in Oracle database by their size grouped into predefined intervals.

Bytes to kilobytes would be dividing by 1024. The divisions take you from bytes to kilobytes.

SELECT size_interval,

       count(*) AS no_of_tables

  FROM (SELECT DATA.segment_name table_name,

              CASE

               WHEN DATA.kilobytes> 1000000000

               THEN '1b Kilobytes (KB) and more'

               WHEN DATA.kilobytes> 1000000

               THEN '1m - 1b Kilobytes (KB)'

               WHEN DATA.kilobytes> 1000

               THEN '1k - 1m Kilobytes (KB)'

               WHEN DATA.kilobytes> 100

               THEN '100 - 1k Kilobytes (KB)'

               WHEN DATA.kilobytes> 10

               THEN '10 - 100 Kilobytes (KB)'

               ELSE '0 - 10 Kilobytes (KB)'

              END AS size_interval

        FROM (SELECT us.segment_name,

                     sum(us.bytes)/1024 kilobytes

                FROM sys.user_segments us,

                     sys.all_tables at

               WHERE at.table_name = us.segment_name

                 AND us.segment_type = 'TABLE'

                  -- excluding some Oracle maintained schemas 

                 AND AT.owner NOT IN ('ANONYMOUS','CTXSYS',

                                      'DBSNMP','EXFSYS', 

                                      'LBACSYS', 'MDSYS', 

                                      'MGMT_VIEW','OLAPSYS', 

                                      'OWBSYS','ORDPLUGINS', 

                                      'ORDSYS', 'SI_INFORMTN_SCHEMA', 

                                      'SYS','SYSMAN',

                                      'SYSTEM', 'TSMSYS',

                                      'DIP', 'WKPROXY',

                                      'WMSYS','XDB',

                                      'APEX_040000', 'APEX_PUBLIC_USER', 

                                      'FLOWS_30000','FLOWS_FILES', 

                                      'MDDATA', 'ORACLE_OCM', 

                                      'XS$NULL', 'SPATIAL_CSW_ADMIN_USR', 

                                      'SPATIAL_WFS_ADMIN_USR', 'PUBLIC', 

                                      'WK_TEST','WKSYS', 'OUTLN')

               GROUP BY us.segment_name

             ) DATA)

       GROUP BY size_interval

       ORDER BY size_interval;

Output:

Fig 2: No. of tables by Kilobytes (KB)

Query 3: [Megabytes] Number of all tables accessible to the current user in Oracle database by their size grouped into predefined intervals.

Bytes to megabytes would be dividing by 1024 two times. The divisions take you from bytes to kilobytes to megabytes.

SELECT size_interval,

       count(*) AS no_of_tables

  FROM (SELECT DATA.segment_name table_name,

              CASE

               WHEN DATA.megabytes> 1000000000

               THEN '1b Megabytes (MB) and more'

               WHEN DATA.megabytes> 1000000

               THEN '1m - 1b Megabytes (MB)'

               WHEN DATA.megabytes> 1000

               THEN '1k - 1m Megabytes (MB)'

               WHEN DATA.megabytes> 100

               THEN '100 - 1k Megabytes (MB)'

               WHEN DATA.megabytes> 10

               THEN '10 - 100 Megabytes (MB)'

               ELSE '0 - 10 Megabytes (MB)'

              END AS size_interval

        FROM (SELECT us.segment_name,

                     sum(us.bytes)/1024/1024 megabytes

                FROM sys.user_segments us,

                     sys.all_tables at

               WHERE at.table_name = us.segment_name

                 AND us.segment_type = 'TABLE'

                  -- excluding some Oracle maintained schemas 

                 AND AT.owner NOT IN ('ANONYMOUS','CTXSYS',

                                      'DBSNMP','EXFSYS', 

                                      'LBACSYS', 'MDSYS', 

                                      'MGMT_VIEW','OLAPSYS', 

                                      'OWBSYS','ORDPLUGINS', 

                                      'ORDSYS', 'SI_INFORMTN_SCHEMA', 

                                      'SYS','SYSMAN',

                                      'SYSTEM', 'TSMSYS',

                                      'DIP', 'WKPROXY',

                                      'WMSYS','XDB',

                                      'APEX_040000', 'APEX_PUBLIC_USER', 

                                      'FLOWS_30000','FLOWS_FILES', 

                                      'MDDATA', 'ORACLE_OCM', 

                                      'XS$NULL', 'SPATIAL_CSW_ADMIN_USR', 

                                      'SPATIAL_WFS_ADMIN_USR', 'PUBLIC', 

                                      'WK_TEST','WKSYS', 'OUTLN')

               GROUP BY us.segment_name

             ) DATA)

       GROUP BY size_interval

       ORDER BY size_interval;

Output:

Fig 3: No. of tables by Megabytes (MB)

Query 4: [Gigabytes] Number of all tables accessible to the current user in Oracle database by their size grouped into predefined intervals.

Bytes to gigabytes would be dividing by 1024 three times. The divisions take you from bytes to kilobytes to megabytes to gigabytes.

SELECT size_interval,

       count(*) AS no_of_tables

  FROM (SELECT DATA.segment_name table_name,

              CASE

               WHEN DATA.gigabytes> 1000000000

               THEN '1b Gigabytes (GB) and more'

               WHEN DATA.gigabytes> 1000000

               THEN '1m - 1b Gigabytes(GB)'

               WHEN DATA.gigabytes> 1000

               THEN '1k - 1m Gigabytes (GB)'

               WHEN DATA.gigabytes> 100

               THEN '100 - 1k Gigabytes (GB)'

               WHEN DATA.gigabytes> 10

               THEN '10 - 100 Gigabytes (GB)'

               ELSE '0 - 10 Gigabytes (GB)'

              END AS size_interval

        FROM (SELECT us.segment_name,

                     sum(us.bytes)/1024/1024/1024 gigabytes

                FROM sys.user_segments us,

                     sys.all_tables at

               WHERE at.table_name = us.segment_name

                 AND us.segment_type = 'TABLE'

                  -- excluding some Oracle maintained schemas 

                 AND AT.owner NOT IN ('ANONYMOUS','CTXSYS',

                                      'DBSNMP','EXFSYS', 

                                      'LBACSYS', 'MDSYS', 

                                      'MGMT_VIEW','OLAPSYS', 

                                      'OWBSYS','ORDPLUGINS', 

                                      'ORDSYS', 'SI_INFORMTN_SCHEMA', 

                                      'SYS','SYSMAN',

                                      'SYSTEM', 'TSMSYS',

                                      'DIP', 'WKPROXY',

                                      'WMSYS','XDB',

                                      'APEX_040000', 'APEX_PUBLIC_USER', 

                                      'FLOWS_30000','FLOWS_FILES', 

                                      'MDDATA', 'ORACLE_OCM', 

                                      'XS$NULL', 'SPATIAL_CSW_ADMIN_USR', 

                                      'SPATIAL_WFS_ADMIN_USR', 'PUBLIC', 

                                      'WK_TEST','WKSYS', 'OUTLN')

               GROUP BY us.segment_name

             ) DATA)

       GROUP BY size_interval

       ORDER BY size_interval;

Output:

Fig 4: No. of tables by Gigabytes (GB)

Query 5: [Terabytes] Number of all tables accessible to the current user in Oracle database by their size grouped into predefined intervals.

Bytes to gigabytes would be dividing by 1024 four times. The divisions take you from bytes to kilobytes to megabytes to gigabytes to terabytes.

SELECT size_interval,

       count(*) AS no_of_tables

  FROM (SELECT DATA.segment_name table_name,

              CASE

               WHEN DATA.terabytes> 1000000000

               THEN '1b Terabytes (TB) and more'

               WHEN DATA.terabytes> 1000000

               THEN '1m - 1b Terabytes (TB)'

               WHEN DATA.terabytes> 1000

               THEN '1k - 1m Terabytes (TB)'

               WHEN DATA.terabytes> 100

               THEN '100 - 1k Terabytes (TB)'

               WHEN DATA.terabytes> 10

               THEN '10 - 100 Terabytes (TB)'

               ELSE '0 - 10 Terabytes (TB)'

              END AS size_interval

        FROM (SELECT us.segment_name,

                     sum(us.bytes)/1024/1024/1024/1024 terabytes

                FROM sys.user_segments us,

                     sys.all_tables at

               WHERE at.table_name = us.segment_name

                 AND us.segment_type = 'TABLE'

                  -- excluding some Oracle maintained schemas 

                 AND AT.owner NOT IN ('ANONYMOUS','CTXSYS',

                                      'DBSNMP','EXFSYS', 

                                      'LBACSYS', 'MDSYS', 

                                      'MGMT_VIEW','OLAPSYS', 

                                      'OWBSYS','ORDPLUGINS', 

                                      'ORDSYS', 'SI_INFORMTN_SCHEMA', 

                                      'SYS','SYSMAN',

                                      'SYSTEM', 'TSMSYS',

                                      'DIP', 'WKPROXY',

                                      'WMSYS','XDB',

                                      'APEX_040000', 'APEX_PUBLIC_USER', 

                                      'FLOWS_30000','FLOWS_FILES', 

                                      'MDDATA', 'ORACLE_OCM', 

                                      'XS$NULL', 'SPATIAL_CSW_ADMIN_USR', 

                                      'SPATIAL_WFS_ADMIN_USR', 'PUBLIC', 

                                      'WK_TEST','WKSYS', 'OUTLN')

               GROUP BY us.segment_name

             ) DATA)

       GROUP BY size_interval

       ORDER BY size_interval;

Output:

Fig 5: No. of tables by Terabytes (TB)

Reference:

• ALL_TABLES
• USER_SEGMENTS

That's it.

Happy APEXing!!!...