您好,登錄后才能下訂單哦!
這篇文章主要介紹了數(shù)據(jù)庫中如何查看故障時(shí)間等待事件、問題sql及會(huì)話訪問次數(shù),具有一定借鑒價(jià)值,感興趣的朋友可以參考下,希望大家閱讀完這篇文章之后大有收獲,下面讓小編帶著大家一起了解一下。
DBA_HIST_ACTIVE_SESS_HISTORY
DBA_HIST_ACTIVE_SESS_HISTORY displays the history of the contents of the in-memory active session history of recent system activity. This view contains snapshots of V$ACTIVE_SESSION_HISTORY. See "V$ACTIVE_SESSION_HISTORY" for further interpretation details for many of these columns (except SNAP_ID, DBID, and INSTANCE_NUMBER).
查看故障時(shí)間段等待事件、問題sql id及會(huì)話訪問次數(shù)
--alter session set nls_date_format='yyyy-mm-dd hh34:mi:ss'; select trunc(sample_time, 'mi') tm, sql_id, nvl(event,'CPU'),count(distinct session_id) cnt from dba_hist_active_sess_history where sample_time between to_date('2019-08-22 14:00:00') and to_date('2019-08-22 14:30:00') group by trunc(sample_time, 'mi'), sql_id,nvl(event,'CPU') order by cnt desc;
查看該sql相關(guān)的等待事件及對(duì)應(yīng)的會(huì)話訪問次數(shù)
select sql_id, nvl(event, 'CPU'), count(distinct session_id) sz from dba_hist_active_sess_history a, dba_hist_snapshot b where sample_time between to_date('2019-08-22 14:00:00') and to_date('2019-08-22 15:00:00') and sql_id = '4ksvn2rgjnhcm' and a.snap_id = b.snap_id and a.instance_number = b.instance_number group by sql_id, nvl(event, 'CPU') order by sz desc;
感謝你能夠認(rèn)真閱讀完這篇文章,希望小編分享的“數(shù)據(jù)庫中如何查看故障時(shí)間等待事件、問題sql及會(huì)話訪問次數(shù)”這篇文章對(duì)大家有幫助,同時(shí)也希望大家多多支持億速云,關(guān)注億速云行業(yè)資訊頻道,更多相關(guān)知識(shí)等著你來學(xué)習(xí)!
免責(zé)聲明:本站發(fā)布的內(nèi)容(圖片、視頻和文字)以原創(chuàng)、轉(zhuǎn)載和分享為主,文章觀點(diǎn)不代表本網(wǎng)站立場,如果涉及侵權(quán)請聯(lián)系站長郵箱:is@yisu.com進(jìn)行舉報(bào),并提供相關(guān)證據(jù),一經(jīng)查實(shí),將立刻刪除涉嫌侵權(quán)內(nèi)容。