MySQL性能监控(sql命令语句 & MONyog工具)全掌握，这一篇足以！

select event，sum(decode(wait_Time，0，0，1)) "Prev"，
  sum(decode(wait_Time，0，1，0)) "Curr"，count(*) "Tot"
  from v$session_Wait
  group by event order by 4;

select name， waits， gets， waits/gets "Ratio"
  from v$rollstat a， v$rollname b
  where a.usn = b.usn;

select df.tablespace_name name，df.file_name "file"，f.phyrds pyr，f.phyblkrd pbr，f.phywrts pyw， f.phyblkwrt pbw
from v$filestat f， dba_data_files df
  where f.file# = df.file_id
  order by df.tablespace_name;

select substr(a.file#，1，2) "#"， substr(a.name，1，30) "Name"，
  a.status， a.bytes， b.phyrds， b.phywrts
  from v$datafile a， v$filestat b
  where a.file# = b.file#;

select user_indexes.table_name， user_indexes.index_name，uniqueness， column_name
  from user_ind_columns， user_indexes
  where user_ind_columns.index_name = user_indexes.index_name
  and user_ind_columns.table_name = user_indexes.table_name
  order by user_indexes.table_type， user_indexes.table_name，
  user_indexes.index_name， column_position;

select a.value + b.value "logical_reads"， c.value "phys_reads"，
  round(100 * ((a.value+b.value)-c.value) / (a.value+b.value)) "BUFFER HIT RATIO"
  from v$sysstat a， v$sysstat b， v$sysstat c
  where a.statistic# = 38 and b.statistic# = 39
  and c.statistic# = 40;

select parameter， gets，Getmisses ， getmisses/(gets+getmisses)*100 "miss ratio"，
  (1-(sum(getmisses)/ (sum(gets)+sum(getmisses))))*100 "Hit ratio"
  from v$rowcache
  where gets+getmisses <>0
  group by parameter， gets， getmisses;

select sum(pins) "Total Pins"， sum(reloads) "Total Reloads"，
  sum(reloads)/sum(pins) *100 libcache
  from v$librarycache;
  select sum(pinhits-reloads)/sum(pins) "hit radio"，sum(reloads)/sum(pins) "reload percent"
  from v$librarycache;

select count(name) num_instances ，type ，sum(source_size) source_size ，
  sum(parsed_size) parsed_size ，sum(code_size) code_size ，sum(error_size) error_size，
  sum(source_size) +sum(parsed_size) +sum(code_size) +sum(error_size) size_required
  from dba_object_size
  group by type order by 2;

SELECT name， gets， misses， immediate_gets， immediate_misses，
  Decode(gets，0，0，misses/gets*100) ratio1，
  Decode(immediate_gets+immediate_misses，0，0，
  immediate_misses/(immediate_gets+immediate_misses)*100) ratio2
  FROM v$latch WHERE name IN ('redo allocation'， 'redo copy');片

SELECT name， value FROM v$sysstat WHERE name IN ('sorts (memory)'， 'sorts (disk)');

SELECT osuser， username， sql_text from v$session a， v$sqltext b
  where a.sql_address =b.address order by address， piece;

SELECT (SUM(PINS - RELOADS)) / SUM(PINS) "LIB CACHE" FROM V$LIBRARYCACHE;
  SELECT (SUM(GETS - GETMISSES - USAGE - FIXED)) / SUM(GETS) "ROW CACHE" FROM V$ROWCACHE;
  SELECT SUM(PINS) "EXECUTIONS"， SUM(RELOADS) "CACHE MISSES WHILE EXECUTING" FROM V$LIBRARYCACHE;

SELECT SUM(GETS) "DICTIONARY GETS"，SUM(GETMISSES) "DICTIONARY CACHE GET MISSES"
  FROM V$ROWCACHE

select * from sys.props$ where name='NLS_CHARACTERSET';

select busy/(busy+idle) "shared servers busy" from v$dispatcher;

select sum(wait)/sum(totalq) "dispatcher waits" from v$queue where type='dispatcher';
  select count(*) from v$dispatcher;
  select servers_highwater from v$mts;

log-slow-queries=/var/lib/mysql/slowquery.log
long_query_time=2
log-queries-not-using-indexe