2026-03-12 20:23:15
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tpt/lastchanged.sql
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185
tpt/lastchanged.sql
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-- Copyright 2018 Tanel Poder. All rights reserved. More info at http://tanelpoder.com
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-- Licensed under the Apache License, Version 2.0. See LICENSE.txt for terms & conditions.
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--------------------------------------------------------------------------------
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--
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-- File name: lastchanged.sql
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-- Purpose: Detect when a datablock in table was last changed
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--
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-- Author: Tanel Poder
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-- Copyright: (c) http://www.tanelpoder.com
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--
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-- Usage: @lastchanged <table_name> <filter_conditions>
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--
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-- @lastchanged obj$ name='MYTABLE'
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-- @lastchanged emp empno=100
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-- @lastchanged scott.emp rowid='AAAMlsAAEAAAAAfAAJ'
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-- @lastchanged emp salary>100000
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-- @lastchanged trades "trader_id=123 and counterparty_id=456"
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--
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-- Other: This script uses the ORA_ROWSCN pseudocolumn which relies on the
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-- last change SCN in datablock header if ROWDEPENDENCIES are not
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-- enabled. Thus without rowdependencies the last change information
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-- is known at BLOCK LEVEL, not row level.
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--
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-- If someone has deleted the row, then this script will not find it
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-- thus report nothing for that row. In such case you can dump the
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-- datablock where this row used to be if you know its address
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-- (taken from a backup for example), read the last change SCN from
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-- block header and use smon_scn_time or v$loghistory to map it to
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-- real time.
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--
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-- Some things like delayed block cleanout or ALTER TABLE MOVE
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-- or ALTER TABLE SHRINK SPACE will alter the last update SCN so
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-- you may get false positives in these cases.
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--
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--------------------------------------------------------------------------------
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COL last_changed FOR A30
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PROMPT
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PROMPT -- LastChanged.sql v1.0 by Tanel Poder ( http://www.tanelpoder.com )
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PROMPT
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PROMPT Running this query:
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PROMPT
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PROMPT . select MAX(ora_rowscn)
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PROMPT . from &1
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PROMPT . where &2;;
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PROMPT
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@@saveset
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SET FEEDBACK OFF
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VAR max_date VARCHAR2(50)
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BEGIN
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SELECT TO_CHAR(SCN_TO_TIMESTAMP(MAX(ORA_ROWSCN)), 'YYYY-MM-DD HH24:MI:SS') INTO :max_date
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FROM &1
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WHERE &2;
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EXCEPTION
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WHEN OTHERS THEN NULL;
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END;
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/
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COL runme NOPRINT NEW_VALUE runme
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SELECT
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'scn_to_timestamp ' data_source
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, CASE
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WHEN :max_date IS NULL THEN 'SCN_TO_TIMESTAMP couldn''t convert SCN to time. See next section below'
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ELSE :max_date
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END last_changed
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, CASE WHEN :max_date IS NULL THEN '--' ELSE '' END runme
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FROM dual
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/
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COL runme CLEAR
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WITH
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sq_smon_scn_time AS (
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SELECT * FROM sys.smon_scn_time
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),
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sq_loghistory AS (
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SELECT * FROM v$log_history
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),
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sq_maxscn AS (
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SELECT
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MAX(ORA_ROWSCN) max_scn
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FROM &1
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WHERE &2
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),
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sq_smon AS (
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SELECT
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'sys.smon_scn_time' source
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, MIN(t1.time_dp) first_known_change_after
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, MAX(t2.time_dp) last_known_change_before
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FROM
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sq_smon_scn_time t1
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, sq_smon_scn_time t2
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WHERE
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(t1.scn_wrp * (POWER(2,32)-1) + t1.scn_bas) > (SELECT max_scn FROM sq_maxscn)
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AND (t2.scn_wrp * (POWER(2,32)-1) + t2.scn_bas) < (SELECT max_scn FROM sq_maxscn)
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),
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sq_log AS (
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SELECT
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'v$log_history' source
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, MIN(t1.first_time) first_known_change_after
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, MAX(t2.first_time) last_known_change_before
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FROM
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sq_loghistory t1
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, sq_loghistory t2
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WHERE
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(t1.first_change#) > (SELECT max_scn FROM sq_maxscn)
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AND (t2.first_change#) < (SELECT max_scn FROM sq_maxscn)
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)
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SELECT
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source data_source
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, CASE WHEN last_changed IS NULL THEN 'No matching rows found. Adjust your filter condition' ELSE last_changed END last_changed
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FROM (
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SELECT
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source
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, CASE
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WHEN sq_smon.first_known_change_after IS NULL OR sq_smon.last_known_change_before IS NULL THEN
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CASE WHEN (SELECT sq_maxscn.max_scn FROM sq_maxscn ) <
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( SELECT MIN(scn_wrp * (POWER(2,32)-1) + scn_bas)
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FROM sq_smon_scn_time )
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THEN
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(SELECT 'Before '||TO_CHAR(MIN(time_dp),'YYYY-MM-DD HH24:MI:SS')||
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' (earlier than '||ROUND((SYSDATE - MIN(time_dp)))||' days ago)'
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FROM sq_smon_scn_time)
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WHEN (SELECT sq_maxscn.max_scn FROM sq_maxscn ) >
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( SELECT MAX(scn_wrp * (POWER(2,32)-1) + scn_bas)
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FROM sq_smon_scn_time )
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THEN
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(SELECT 'After '||TO_CHAR(MAX(time_dp),'YYYY-MM-DD HH24:MI:SS')||
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' (between '||ROUND(((SYSDATE - MAX(time_dp))*24*60))||' minutes ago and now)'
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FROM sq_smon_scn_time)
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END
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ELSE
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'Between '||TO_CHAR(last_known_change_before, 'YYYY-MM-DD HH24:MI:SS')||
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' and '||TO_CHAR(first_known_change_after, 'YYYY-MM-DD HH24:MI:SS')||
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' ('||ROUND((first_known_change_after - last_known_change_before)*24*60) || ' minute range)'
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END last_changed
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FROM (
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sq_smon
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)
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UNION ALL
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SELECT
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source data_source
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, CASE
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WHEN sq_log.first_known_change_after IS NULL OR sq_log.last_known_change_before IS NULL THEN
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CASE WHEN (SELECT sq_maxscn.max_scn FROM sq_maxscn ) <
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( SELECT MIN(first_change#) FROM sq_loghistory )
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THEN
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(SELECT 'Before '||TO_CHAR(MIN(first_time),'YYYY-MM-DD HH24:MI:SS')||
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' (earlier than '||ROUND((SYSDATE - MIN(first_time)))||' days ago)'
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FROM sq_loghistory)
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WHEN (SELECT sq_maxscn.max_scn FROM sq_maxscn ) >
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( SELECT MAX(first_change#) FROM sq_loghistory )
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THEN
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(SELECT 'After '||TO_CHAR(MAX(first_time),'YYYY-MM-DD HH24:MI:SS')||
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' (between '||ROUND(((SYSDATE - MAX(first_time))*24*60))||' minutes ago and now)'
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FROM sq_loghistory)
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END
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ELSE
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'Between '||TO_CHAR(last_known_change_before, 'YYYY-MM-DD HH24:MI:SS')||
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' and '||TO_CHAR(first_known_change_after, 'YYYY-MM-DD HH24:MI:SS')||
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' ('||ROUND((first_known_change_after - last_known_change_before)*24*60) || ' minute range)'
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END last_changed
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FROM (
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sq_log
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)
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)
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&runme WHERE 1=0
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/
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SET HEADING OFF
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SELECT COUNT(*)||' rows analyzed.' FROM &1 WHERE &2;
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SET HEADING ON
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@@loadset
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