Regular Manual Check

show tablespace usages status

set linesize 300
SELECT upper(f.tablespace_name) "tablespace_name",
       d.Tot_grootte_Mb "tablespace(M)",
       d.Tot_grootte_Mb - f.total_bytes "used(M)",
       round((d.Tot_grootte_Mb - f.total_bytes) / d.Tot_grootte_Mb * 100,2) "use%",
       f.total_bytes "free_space(M)",
       round(f.total_bytes / d.Tot_grootte_Mb * 100,2) "free%"
 FROM      
    (SELECT tablespace_name,
            round(SUM(bytes)/(1024*1024),2) total_bytes,
            round(MAX(bytes)/(1024*1024),2) max_bytes
      FROM sys.dba_free_space
     GROUP BY tablespace_name) f,
    (SELECT dd.tablespace_name, round(SUM(dd.bytes)/(1024*1024),2) Tot_grootte_Mb
      FROM   sys.dba_data_files dd
      GROUP BY dd.tablespace_name) d
WHERE d.tablespace_name = f.tablespace_name    
ORDER BY 4 DESC
/

Shared Pool Size hit ratio

select round((sum(gets)-sum(reloads))/sum(gets)*100,1) "libiary cache hit ratio %"
from v$librarycache where namespace
in ('SQL AREA','TABLE/PROCEDURE','BODY','TRIGGER');

data dictionary hit ratio

select round((1-sum(getmisses)/sum(gets))*100,1) "data dictionary hit ratio %"
from v$rowcache;

锁竞争

select  substr(ln.name,1,25) Name, 
        l.gets, l.misses, 
        100*(l.misses/l.gets) "% Ratio (STAY UNDER 1%)" 
from v$latch l, v$latchname ln 
where ln.name in ('cache buffers lru chain') 
and ln.latch# = l.latch#;

排序命中率

select a.value "Sort(Disk)", b.value "Sort(Memory)",
round(100*(a.value/decode((a.value+b.value), 0,1,(a.value+b.value))),2) "% Ratio (STAY UNDER 5%)"  
from v$sysstat a, v$sysstat b
where a.name = 'sorts (disk)'
and b.name = 'sorts (memory)';

数据缓冲区命中率