added oracle_tablespace_undo_space.sql

Author: HariSekhon

oracle_tablespace_undo_space.sql

@@ -0,0 +1,44 @@
+--
+--  Author: Hari Sekhon
+--  Date: 2024-10-18 04:24:34 +0400 (Fri, 18 Oct 2024)
+--
+--  vim:ts=4:sts=4:sw=4:et:filetype=sql
+--
+--  https///github.com/HariSekhon/SQL-scripts
+--
+--  License: see accompanying Hari Sekhon LICENSE file
+--
+--  If you're using my code you're welcome to connect with me on LinkedIn and optionally send me feedback to help steer this or other code I publish
+--
+--  https://www.linkedin.com/in/HariSekhon
+--
+
+-- Oracle - Show Tablespace size of the Undo Tablespace
+--
+-- Tested on Oracle 19c
+
+SELECT
+    df.tablespace_name "Tablespace",
+    df.bytes / (1024 * 1024 * 1024) "Size (GB)",
+    (df.bytes - SUM(fs.bytes)) / (1024 * 1024 * 1024) "Used Space (GB)",
+    ROUND(SUM(fs.bytes) / (1024 * 1024 * 1024), 2) "Free Space (GB)",
+    ROUND(SUM(fs.bytes) / df.bytes * 100, 2) "Free Space %"
+FROM
+    dba_free_space fs,
+    (SELECT
+        tablespace_name,
+        SUM(bytes) bytes
+    FROM
+        dba_data_files
+    GROUP BY
+        tablespace_name) df
+WHERE
+    fs.tablespace_name (+) = df.tablespace_name
+        AND
+    UPPER(fs.tablespace_name) LIKE '%UNDO%'
+GROUP BY
+     df.tablespace_name,
+     df.bytes
+ORDER BY
+     "Free Space (GB)" DESC,
+     "Used Space (GB)" DESC;