Show the redo log switching in the database, two different ways to display the information

Author: geekcomputers

redo_log_switches.sql

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+REM Script Name	: redo_log_switches.sql
+REM Author				: Craig Richards
+REM Created	: 30 November 2012 
+REM Last Modified	:
+REM Version				: 1.0
+REM
+REM Modifications	:
+REM
+REM Description		: Show the redo log switching in the database, two different ways to display the information
+
+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$log_history
+WHERE	  TRUNC(first_time) > last_day(SYSDATE-30) +1
+GROUP BY trunc(first_time);
+ 
+-- Daily Count and Size of Redo Log Space (Single Instance)
+
+SELECT		A.*, ROUND(A.COUNT#*B.AVG#/1024/1024) Daily_Avg_Mb
+FROM			(SELECT TO_CHAR(First_Time,'YYYY-MM-DD') DAY, COUNT(1) COUNT#, MIN(RECID) MIN#, MAX(RECID) MAX#
+FROM			v$log_history
+GROUP BY	TO_CHAR(First_Time,'YYYY-MM-DD')
+ORDER BY	1) A,
+(
+SELECT		AVG(BYTES) AVG#, COUNT(1) COUNT#, MAX(BYTES) Max_Bytes, MIN(BYTES) Min_Bytes
+FROM			v$log) B;