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RE: question...

Posted By: Knox, Ernest
Date: Thursday, 11 February 2016, at 4:33 p.m.


Ernie Knox
Sr. Technologist, I&TG - Database Management
Sears Holdings Management Corp
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Cell: (847) 665-0722
Corp. Cell: 224-465-0553=A0
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-----Original Message-----
From: Villagomez, Mary=20
Sent: Thursday, February 11, 2016 3:30 PM
To: Knox, Ernest
Subject: RE: question...

To submit a question, do you address the email to I am having=
trouble with the jvm/java install on the newer Kexe servers, and want to s=
end in a question.

Mary Villagomez
Informix & MySQL DBA
Member Technology
Office: B2-260A
Phone: 847-286-1768

-----Original Message-----
From: Knox, Ernest
Sent: Thursday, February 11, 2016 9:19 AM
To: MySQLDBA Communications
Subject: FW: Transaction Locking and Indexes [36547]

Some Informix knowledge to retain.

Ernie Knox
Sr. Technologist, I&TG - Database Management

-----Original Message-----
From: [] On Behalf Of Art K=
Sent: Thursday, February 11, 2016 10:15 AM
Subject: Re: Transaction Locking and Indexes [36547]


OK, here's what's happening:=20

Without the index every delete has to scan the entire table looking for mat=
ching rows to delete. Each row as it is examined has to be locked, dirty re=
ad or no dirty read, for a fraction of a second. As multiple scans zip thro=
ugh the table it is inevitable that one or more will encounter a row that's=
locked. If multiple sessions have to delete multiple rows on the same page=
they will all have to latch the same page in the cache and so will queue u=
p behind one another each holding a lock on a different row on that one pag=
e. They will single thread on the cache page latch and on the LRU latch nee=
ded to move the page from the clean part of the LRU queue to the dirty part=
or from the middle of the dirty queue to the most recently used end of the=
dirty queue. All that time the N+1st session is waiting for a row lock on =
one of the rows in that frozen page to clear so it can read that row and co=
ntinue its scan. Eventually, sometimes, the last waiter times out before it=
gets access to the locks or latches that it needs.=20

This is one of the few cases in which page locks MIGHT perform better, but =
I doubt it. The index almost eliminates the problem because that waiter who=
doesn't need to update another row on the same cache page is able to skip =
over the page locks because it is scanning the index instead which is not b=
eing locked and which it does not have to acquire a lock for.=20


Art S. Kagel, President and Principal Consultant ASK Database Management ww=


Disclaimer: Please keep in mind that my own opinions are my own opinions an=
d do not reflect on the IIUG, nor any other organization with which I am as=
sociated either explicitly, implicitly, or by inference. Neither do those o=
pinions reflect those of other individuals affiliated with any entity with =
which I am affiliated nor those of the entities themselves.=20

On Thu, Feb 11, 2016 at 9:54 AM, DAVID SIBLEY <> wrote:=20

> Many thanks for the responses although the detail below may explain=20
> the issue a little better.
> The database is in transnational mode. I have set lock mode to wait 30=20
> and the isolation level is dirty read.
> The transaction running within the multiple copies of the application,=20
> one at each location should not clash as the select is unique to each=20
> site, the transactions should be unique.
> The real question is why without an index on the column being used in=20
> the where clause do I get the error outlined and when I add the index=20
> on the column does the error cease and the delete statement executes succ=
> Is there something in the database set-up which would cause this issue?=20
> Forum Note: Use "Reply" to post a response in the discussion forum.=20


Forum Note: Use "Reply" to post a response in the discussion forum.=20

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Messages In This Thread

  • RE: question...
    Knox, Ernest -- Thursday, 11 February 2016, at 4:33 p.m.

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