added oracle_table_shrink_candidates.sql

Author: HariSekhon

oracle_table_shrink_candidates.sql

@@ -0,0 +1,36 @@
+--
+--  Author: Hari Sekhon
+--  Date: 2024-10-11 03:24:48 +0300 (Fri, 11 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 Table Candidates to Move / Shrink in a given Tablespace
+--
+--          where the tables are over 20% utilized
+--
+-- Tested on Oracle 19c
+
+SELECT
+    segment_name,
+    segment_type,
+    ROUND(SUM(bytes)/1024/1024/1024, 2) AS size_gb
+FROM
+    dba_segments
+WHERE
+    tablespace_name = 'USERS' -- XXX: Edit
+GROUP BY
+    segment_name,
+    segment_type
+HAVING
+    SUM(bytes)/1024/1024/1024 > 1
+ORDER BY
+    size_gb DESC;