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Find Locking History [message #679856]

Wed, 08 April 2020 02:18

weekend79
Messages: 198
Registered: April 2005
Location: Islamabad

Senior Member

Hi
Need a query to find the history of "Which query" locked "Which another query/queries".
Note: gone through dba_hist_active_sess_history it gives blocking session serial no and blocking session but I can't get blocking query from it.

Thanks

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Re: Find Locking History [message #679857 is a reply to message #679856]

Wed, 08 April 2020 02:37

John Watson
Messages: 8964
Registered: January 2010
Location: Global Village

Senior Member

What you want may not be possible. Indeed, it is probably logically impossible.

My session could execute a zillion statements that, taken together, lock umpteen rows in numerous tables. And right now, perhaps my session is idle. Then your session hits a row that I have locked. Which of my statements do you want? That information is not recorded anywhere.

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Re: Find Locking History [message #679858 is a reply to message #679857]

Wed, 08 April 2020 02:52

weekend79
Messages: 198
Registered: April 2005
Location: Islamabad

Senior Member

Thanks for enlighting me, Can we find it in a different manner?
i.e. find the history of "Which query" locked "Which another query/queries" and keep it locked for more than 5 seconds?

Plus can we track the blocking query from column BLOCKING_SESSION, BLOCKING_SESSION_SERRIAL#, BLOCKING_INST_ID of table dba_hist_active_sess_history ? if yes then how?

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Re: Find Locking History [message #679859 is a reply to message #679858]

Wed, 08 April 2020 03:46

Michel Cadot
Messages: 68732
Registered: March 2007
Location: Saint-Maur, France, https...

Senior Member
Account Moderator

There is no history of locks.
There is no complete history of queries (ash is just samples).

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Re: Find Locking History [message #679860 is a reply to message #679858]

Wed, 08 April 2020 03:46

cookiemonster
Messages: 13963
Registered: September 2008
Location: Rainy Manchester

Senior Member

Nope - oracle tracks which session has a lock, it does not track which query did.

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Re: Find Locking History [message #679861 is a reply to message #679858]

Wed, 08 April 2020 03:48

John Watson
Messages: 8964
Registered: January 2010
Location: Global Village

Senior Member

The history you want is not possible. What if I insert a row and then update it and then delete it, all in one transaction. Which of the statements would you want?

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Re: Find Locking History [message #679862 is a reply to message #679861]

Wed, 08 April 2020 04:06

weekend79
Messages: 198
Registered: April 2005
Location: Islamabad

Senior Member

Thanks, John Watson & Michel Cadot

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