DECLARE
libcac NUMBER(10,2);
rowcac NUMBER(10,2);
bufcac NUMBER(10,2);
redlog NUMBER(10,2);
spsize NUMBER;
blkbuf NUMBER;
logbuf NUMBER;
BEGIN
SELECT VALUE INTO redlog FROM v$sysstat
WHERE name = 'redo log space requests';
SELECT 100*(SUM(pins)-SUM(reloads))/SUM(pins) INTO libcac FROM v$librarycache;
SELECT 100*(SUM(gets)-SUM(getmisses))/SUM(gets) INTO rowcac FROM v$rowcache;
SELECT 100*(cur.VALUE + con.VALUE - phys.VALUE)/(cur.VALUE + con.VALUE) INTO bufcac
FROM v$sysstat cur,v$sysstat con,v$sysstat phys,v$statname ncu,v$statname nco,v$statname nph
WHERE cur.statistic# = ncu.statistic#
AND ncu.name = 'db block gets'
AND con.statistic# = nco.statistic#
AND nco.name = 'consistent gets'
AND phys.statistic# = nph.statistic#
AND nph.name = 'physical reads';
SELECT VALUE INTO spsize FROM v$parameter WHERE name = 'shared_pool_size';
SELECT VALUE INTO blkbuf FROM v$parameter WHERE name = 'db_block_buffers';
SELECT VALUE INTO logbuf FROM v$parameter WHERE name = 'log_buffer';
DBMS_OUTPUT.put_line('> SGA CACHE STATISTICS');
DBMS_OUTPUT.put_line('> ********************');
DBMS_OUTPUT.put_line('> SQL Cache Hit rate = '||libcac);
DBMS_OUTPUT.put_line('> Dict Cache Hit rate = '||rowcac);
DBMS_OUTPUT.put_line('> Buffer Cache Hit rate = '||bufcac);
DBMS_OUTPUT.put_line('> Redo Log space requests = '||redlog);
DBMS_OUTPUT.put_line('> ');
DBMS_OUTPUT.put_line('> INIT.ORA SETTING');
DBMS_OUTPUT.put_line('> ****************');
DBMS_OUTPUT.put_line('> Shared Pool Size = '||spsize||' Bytes');
DBMS_OUTPUT.put_line('> DB Block Buffer = '||blkbuf||' Blocks');
DBMS_OUTPUT.put_line('> Log Buffer = '||logbuf||' Bytes');
DBMS_OUTPUT.put_line('> ');
IF
libcac < 99 THEN DBMS_OUTPUT.put_line
('*** HINT: Library Cache too low! Increase the Shared Pool Size.');
END IF;
IF
rowcac < 85 THEN DBMS_OUTPUT.put_line
('*** HINT: Row Cache too low! Increase the Shared Pool Size.');
END IF;
IF
bufcac < 90 THEN DBMS_OUTPUT.put_line
('*** HINT: Buffer Cache too low! Increase the DB Block Buffer value.');
END IF;
IF
redlog > 100 THEN DBMS_OUTPUT.put_line
('*** HINT: Log Buffer value is rather low!');
END IF;
END;
/
Halim is a Sr. Database Engineer/Data Architect (in Atlanta, USA) who is an Oracle certified (OCP) DBA, (OCP) Developer, Certified Cloud Architect Professional as well as OCI Autonomous DB specialist with extensive expertise in Database design, configuration, tuning, capacity planning, RAC, DG, Scripting, Python, PL/SQL etc. He achieved 16th position in worldwide first-ever PL/SQL Challenge cup playoff- http://plsql-challenge.blogspot.com/2010/07/winners-of-first-plsql-challenge.html
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