---查詢sql當前的指標：
select
a.hash_value, a.sql_text,
a.plan_hash_value,
round(a.buffer_gets/a.executions) bg_per_exec,
round(a.cpu_time/1000/a.executions) cpu_per_exec,
round(a.elapsed_time/1000/a.executions) time_per_exec,
round(a.rows_processed/a.executions) rows_per_exec,
a.executions,
a.buffer_gets,
a.disk_reads,
a.cpu_time,
a.elapsed_time,
a.rows_processed
from v$sql a
where hash_value=377282797
and cpu_time<>0
and buffer_gets<>0
and rows_processed<>0
order by sql_text
/--查詢sql的歷史執行次數變化：
select b.begin_interval_time, a.sql_id,a.executions_delta,a.executions_delta/(15*60)
from dba_hist_sqlstat a, dba_hist_snapshot b where
a.sql_id in ('0js9jz3qx087j')
and b.begin_interval_time> to_date('2014-03-31 13:00:00','yyyy-mm-dd hh24:mi:ss')
and b.begin_interval_time
---sql歷史上邏輯讀、物理讀、執行時間等的變化 (毫秒)
select b.begin_interval_time, a.sql_id,a.plan_hash_value,a.executions_delta,
round((a.buffer_gets_delta) /decode(nvl(a.executions_delta, 0),0,1, a.executions_delta),3) bg_per_exec,
round((a.disk_reads_delta) /decode(nvl(a.executions_delta, 0),0,1, a.executions_delta),3) diskr_per_exec,
round((a.cpu_time_delta/1000) /decode(nvl(a.executions_delta, 0),0,1, a.executions_delta),3) ctime_ms_per_exec,
round((a.elapsed_time_delta/1000) /decode(nvl(a.executions_delta, 0),0,1, a.executions_delta),3) etime_ms_per_exec,
round((a.apwait_delta/1000) /decode(nvl(a.executions_delta, 0),0,1, a.executions_delta),3) apwait_delta_ms_per_exec,
round((a.ccwait_delta/1000) /decode(nvl(a.executions_delta, 0),0,1, a.executions_delta),3) ccwait_delta_ms_per_exec,
round((a.rows_processed_total) /decode(nvl(a.executions_delta, 0),0,1, a.executions_delta),3) row_process_per_exec
from dba_hist_sqlstat a, dba_hist_snapshot b
where a.sql_id = 'atd4sn0445c66'
and b.begin_interval_time> to_date('2014-12-04 09:00:00','yyyy-mm-dd hh24:mi:ss')
and b.begin_interval_timeselect b.begin_interval_time, a.sql_id,a.plan_hash_value,a.executions_delta,
round(a.buffer_gets_delta/a.executions_delta,3) bg_per_exec,
round(a.disk_reads_delta/a.executions_delta,3) diskr_per_exec,
round(a.cpu_time_delta/1000/a.executions_delta,3) ctime_ms_per_exec,
round(a.elapsed_time_delta/1000/a.executions_delta,3) etime_ms_per_exec,
round(a.apwait_delta/1000/a.executions_delta,3) apwait_ms_delta_per_exec,
round(a.ccwait_delta/1000/a.executions_delta,3) ccwait_ms_delta_per_exec,
round(a.rows_processed_total/a.executions_delta,3) row_process_per_exec
from dba_hist_sqlstat a, dba_hist_snapshot b
where a.sql_id = 'fvxkpft53fmqj'
and b.begin_interval_time> to_date('2014-12-26 09:00:00','yyyy-mm-dd hh24:mi:ss')
and b.begin_interval_time
----查詢一段時間內每個snapshot 間隔內的top sql：
select snap_id,begin_interval_time,sql_id,executions_delta,round(cpu_time_ms/executions_delta) cpu_time_per_exec_ms,ranking from
(select * from
(select a.snap_id,b.begin_interval_time,a.sql_id,a.executions_delta,round(a.cpu_time_delta/1000) cpu_time_ms,
rank() over (partition by a.snap_id order by a.cpu_time_delta desc) ranking
from dba_hist_sqlstat a, dba_hist_snapshot b
where a.snap_id=b.snap_id
and b.begin_interval_time> to_date('2015-01-04 09:30:00','yyyy-mm-dd hh24:mi:ss')
and b.begin_interval_time
SQL資料庫相關
資料庫相關知識點 sql,對錶的理解,對錶的主鍵,外來鍵的理解,檢視,為什麼要有檢視,檢視有什麼功能,檢視與表有什麼區別 主鍵是唯一標識的一條記錄，不能重複，不能為空 表的外來鍵是另乙個表的主鍵，可以重複，可以為空 索引，字段沒有重複值，可以有空值，可以有乙個或者多個唯一索引 檢視是乙個或者多個表按...
oracle資料庫相關操作
查詢兩個欄位的重複資料 select from a1 a where a.rowid select max b.rowid from a1 b where a.cldbh b.cldbh and a.sjsj b.sjsj rowid是資料的詳細位址，通過rowid，oracle可以快速的定位某行具...
oracle資料庫相關操作
最近公司乙個專案要遷移到oracle資料庫，發現oracle與mysql操作有很多不同，記錄一下 獲取系統時間 mysql newdate sqlserver sysdatetime oracle sysdate ora 00911 無效字元 在mybatis中寫oracle sql，末尾不要加分號...