2026-03-12 20:23:15

tpt/demos/buffer_busy.sql

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+-- Copyright 2018 Tanel Poder. All rights reserved. More info at http://tanelpoder.com
+-- Licensed under the Apache License, Version 2.0. See LICENSE.txt for terms & conditions.
+
+-- DROP TABLE tbb;
+-- DROP SEQUENCE tbb_seq;
+-- 
+-- CREATE SEQUENCE tbb_seq NOCACHE;
+-- 
+-- CREATE TABLE tbb (
+--      id         NUMBER PRIMARY KEY
+--    , val        NUMBER
+--    , entry_date DATE
+-- );
+-- 
+-- CREATE INDEX tbb_entry ON tbb(entry_date);
+-- 
+-- INSERT INTO tbb VALUES (0, 123, sysdate);
+-- COMMIT;
+
+DECLARE
+   tmp_id NUMBER;
+BEGIN
+
+    WHILE TRUE LOOP
+
+        SELECT MIN(id) INTO tmp_id FROM tbb;
+
+        INSERT INTO tbb VALUES (tbb_seq.NEXTVAL, 123, sysdate);
+
+        BEGIN
+            DELETE FROM tbb WHERE id = tmp_id;
+        EXCEPTION
+            WHEN no_data_found THEN NULL;
+        END;
+
+        COMMIT;
+
+    END LOOP;
+
+END;
+/
+
+
+
+
+