oracle常用经典SQL查询

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17。查看等待（wait）情况

SELECT v$waitstat.class, v$waitstat.count count, SUM(v$sysstat.value) sum_value 

FROM v$waitstat, v$sysstat WHERE v$sysstat.name IN (’db block gets’, 

’consistent gets’) group by v$waitstat.class, v$waitstat.count

 

18。查看sga情况

SELECT NAME, BYTES FROM SYS.V_$SGASTAT ORDER BY NAME ASC

 

19。查看catched object

SELECT owner,              name,              db_link,              namespace,  

           type,              sharable_mem,              loads,              executions,   

          locks,              pins,              kept        FROM v$db_object_cache

          

20。查看V$SQLAREA

SELECT SQL_TEXT, SHARABLE_MEM, PERSISTENT_MEM, RUNTIME_MEM, SORTS, 

VERSION_COUNT, LOADED_VERSIONS, OPEN_VERSIONS, USERS_OPENING, EXECUTIONS, 

USERS_EXECUTING, LOADS, FIRST_LOAD_TIME, INVALIDATIONS, PARSE_CALLS, DISK_READS,

BUFFER_GETS, ROWS_PROCESSED FROM V$SQLAREA

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