• 正在執(zhí)行的語句查詢和拼接殺進(jìn)程

SELECT  'alter system kill session '''||b.sid||','|| 
    b.serial#||''';',b.sid oracleID,
b.username Oracle用戶,
b.serial#,
spid 操作系統(tǒng)ID,
paddr,
sql_text 正在執(zhí)行的SQL,
b.machine 計算機(jī)名
FROM v$process a, v$session b, v$sqlarea c
WHERE a.addr = b.paddr
AND b.sql_hash_value = c.hash_value;

• 鎖表語句殺進(jìn)程

select 'alter system kill session '''||s.sid||','|| 
    s.serial#||''';', l.session_id sid, 
s.serial#, 
l.locked_mode, 
l.oracle_username, 
s.user#, 
l.os_user_name, 
s.machine, 
s.terminal, 
a.sql_text, 
a.action 
from v$sqlarea a, v$session s, v$locked_object l 
where l.session_id = s.sid 
and s.prev_sql_addr = a.address 
order by sid, s.serial#;

• 最耗費CPU

select *
  from (select sql_text,
               buffer_gets,
               disk_reads,
               sorts,
               cpu_time / 1000000 cpu_sec,
               executions,
               rows_processed
          from v$sqlstats
         order by cpu_time DESC)
 where rownum < 11;

• 最耗費CPU的sql語句

select *
  from (select a.sid session_id,
               a.sql_id,
               a.status,
               a.cpu_time / 1000000 cpu_sec,
               a.buffer_gets,
               a.disk_reads,
               b.sql_text sql_text
          from v$sql_monitor a, v$sql b
         where a.sql_id = b.sql_id
         order by a.cpu_time desc)
 where rownum <= 20;

• 數(shù)據(jù)庫狀態(tài)分析

select   *  from (SELECT T.INST_ID,T.SQL_ID,T.LAST_ACTIVE_TIME,T.SQL_PROFILE, --如果該字段有值，就是按固化走執(zhí)行計劃
       T.PLAN_HASH_VALUE,T.SQL_FULLTEXT,T.CHILD_NUMBER 執(zhí)行計劃版本號,
       TRUNC((T.CPU_TIME/T.EXECUTIONS/1000000),4) 每次CPU時間,TRUNC((T.ELAPSED_TIME-T.CPU_TIME)/T.EXECUTIONS/1000000,4)"每次等待時間",T.EXECUTIONS 總執(zhí)行次數(shù),
      --trunc(T.EXECUTIONS/((T.LAST_ACTIVE_TIME-to_date(T.LAST_LOAD_TIME,'yyyy/mm/dd hh24:mi:ss'))*86400)) 平均每秒執(zhí)行次數(shù),
       round(t.ROWS_PROCESSED/t.executions,2) 平均返回行數(shù),TRUNC(T.ELAPSED_TIME / T.EXECUTIONS / 1000000,4) "每次執(zhí)行（秒）",
       TRUNC((T.BUFFER_GETS / T.EXECUTIONS/1000000),4) 每次邏輯讀,TRUNC((T.DISK_READS / T.EXECUTIONS/1000000),4) 每次物理讀,
       TRUNC((t.cluster_wait_time/t.EXECUTIONS/1000000),4) 每次集群等待,TRUNC((t.user_io_wait_time/t.EXECUTIONS/1000000),4) 每次IO等待,
       TRUNC((t.application_wait_time/t.EXECUTIONS/1000000),4) 每次應(yīng)用等待,TRUNC((t.concurrency_wait_time/t.EXECUTIONS/1000000),4) 每次并發(fā)等待,
       T.FIRST_LOAD_TIME 首次硬解析時間,T.LAST_LOAD_TIME 上次硬解析時間,
       t.MODULE,t.ACTION,t.PARSING_SCHEMA_NAME,TRUNC(T.ELAPSED_TIME/1000000,4) "執(zhí)行時間（秒）",
       TRUNC(T.CPU_TIME/1000000,4) CPU時間,t.PARSE_CALLS 總解析次數(shù), t.LOADS 硬解析次數(shù), T.BUFFER_GETS,T.CLUSTER_WAIT_TIME,
       T.USER_IO_WAIT_TIME,T.APPLICATION_WAIT_TIME,T.CONCURRENCY_WAIT_TIME,T.PLAN_HASH_VALUE
  FROM GV$SQL T
where t.EXECUTIONS >0
 --and t.sql_id='cjrpgh8gqybs0'
 order by t.CPU_TIME desc) xx
 where rownum<=20;

• 最耗緩存

SELECT * FROM (
SELECT SQL_FULLTEXT sql,
        buffer_gets, executions, buffer_gets/executions "Gets/Exec",
        hash_value,address,LAST_ACTIVE_TIME
   FROM V$SQLAREA
  WHERE buffer_gets > 10000
ORDER BY buffer_gets DESC)
WHERE rownum <= 10 ;

• 最多物理讀取

SELECT * FROM (
SELECT SQL_FULLTEXT sql,
        disk_reads, executions, disk_reads/executions "Reads/Exec",
        hash_value,address,LAST_ACTIVE_TIME
   FROM V$SQLAREA
  WHERE disk_reads > 1000
ORDER BY disk_reads DESC)
WHERE rownum <= 10 ;

• 最多執(zhí)行

SELECT * FROM (
SELECT substr(sql_text,1,40) sql,SQL_FULLTEXT,
        executions, rows_processed, rows_processed/executions "Rows/Exec",
        hash_value,address,LAST_ACTIVE_TIME
   FROM V$SQLAREA
  WHERE executions > 100
ORDER BY executions DESC)
WHERE rownum <= 10 ;

• 最耗內(nèi)存

SELECT * FROM (
SELECT substr(sql_text,1,40) sql,
        sharable_mem, executions, hash_value,address,LAST_ACTIVE_TIME
   FROM V$SQLAREA
  WHERE sharable_mem > 1048576
ORDER BY sharable_mem DESC)
WHERE rownum <= 10 ;

• 失效的索引重建

select 'alter index '||index_name||' rebuild online;' from user_indexes where status <> 'VALID' and index_name not like'%$$';