Shows log switches in the database

Author: geekcomputers

log_switches.sql

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+REM Script Name	: log_switches.sql
+REM Author				: Craig Richards
+REM Created			: 18 March 2013 
+REM Last Modified	:
+REM Version			: 1.0
+REM
+REM Modifications	:
+REM
+REM Description		: Show information about recent log switches in the database, orginally got FROM http://www.dba-oracle.com/tips_oracle_v$_log_history.htm
+
+COLUMN c1 format a10 HEADING "Month"
+COLUMN c2 format a25 HEADING "Archive Date"
+COLUMN c3 format 999 HEADING "Switches"
+
+COMPUTE AVG of C on A
+COMPUTE AVG of C on REPORT
+
+BREAK ON A skip 1 ON REPORT SKIP 1
+
+SELECT		TO_CHAR(TRUNC(first_time), 'Month') c1,
+						TO_CHAR(TRUNC(first_time), 'Day : DD-Mon-YYYY') c2,  COUNT(*) c3
+FROM			v$log_history
+WHERE			TRUNC(first_time) > last_day(sysdate-100) +1
+GROUP BY	TRUNC(first_time);
+
+   
+REM Daily COUNT and Size of Redo Log Space (Single Instance)
+
+SELECT 	A.*, ROUND(A.COUNT#*B.AVG#/1024/1024) Daily_Avg_Mb
+FROM
+(
+  SELECT
+  TO_CHAR(First_Time,'YYYY-MM-DD') DAY,
+  COUNT(1) COUNT#,
+  MIN(RECID) Min#,
+  MAX(RECID) Max#
+FROM
+   v$log_history
+GROUP BY 
+   TO_CHAR(First_Time,'YYYY-MM-DD')
+ORDER BY 1 DESC
+) A,
+(
+SELECT
+AVG(BYTES) AVG#,
+COUNT(1) COUNT#,
+MAX(BYTES) Max_Bytes,
+MIN(BYTES) Min_Bytes
+FROM v$log
+) B
+;
+