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IDS Forum

RE: Long transaction aborted in alter table

Posted By: Mike Walker
Date: Sunday, 4 March 2018, at 3:37 p.m.

In Response To: Re: Long transaction aborted in alter table (jorge valenzuela)

Do you mean can you get away with ALTERING the table if you delete a lot of
records?

The smaller the table, the smaller the transaction will be when you alter
the table and the more likely it will be that the alter will complete. But
whether the alter will succeed depends on many factors - the size of the
table, the number of logs, the size of the logs, other things running at the
time, duration of the transaction, whether there are indexes on the table,
etc...so it's not really possible to say.

-----Original Message-----
From: ids-bounces@iiug.org [mailto:ids-bounces@iiug.org] On Behalf Of jorge
valenzuela
Sent: Sunday, March 04, 2018 1:28 PM
To: ids@iiug.org
Subject: Re: Long transaction aborted in alter table [40785]

If I delete a lot of records, can I update the table?

> El 03/03/2018, a las 16:12, Jack Parker <jack.parker4@verizon.net>
escribió:
>
> Why the hell doesnt email format properly?
>
> set pdqpriority 10; for the unload, this is the turbo button.
>
> create raw table <table> ()
> raw is important if you want optimal load performance.
>
> ....
>
> insert into <table> select *, <literal value> from <table>_ext;
>
> do a level 0 backup, even if it is to /dev/null.
>
> Hope that solves some of the mysteries that my email agent introduced.
>
> cheers
> j.
>
>> On Mar 3, 2018, at 7:06 PM, Jack Parker <jack.parker4@verizon.net> wrote:

>>
>> Really, use an external table as Mike suggests - especially if
>> it=E2=80=99= s a large table. (I love the detail Mike put into his
>> answer). I = differ from Mike in that I think it=E2=80=99s easier to
>> add the column = on the reload:
>>
>> create external table <table>_ext sameas <table> using (
>>
>> datafiles
>>
>> (
>>
>> "DISK:/<path>/<table>1.unl",
>>
>> "DISK:/<path>/<table>2.unl",
>>
>> =E2=80=A6..
>>
>> "DISK:/<path>/<table>32.unl",
>>
>> ),
>>
>> format "delimited",
>>
>> escape on,
>>
>> express
>> );
>>
>> set pdqpriority 10; =E2=80=94 Important, you want to take advantage
>> of = PDQ for the unload! This is the turbo button.
>> insert into <table>_ext select * from <table>;
>>
>> (drop and recreate your table with the new column =E2=80=94 create
>> raw = table <table> (=E2=80=A6=E2=80=A6=E2=80=A6) );
>> =E2=80=94 Important to create the table as raw is you want optimal
>> load = performance.
>>
>> insert into <table> select *, =E2=80=98D=E2=80=99 from <table>_ext;
>>
>> Alter table <table> type (standard); create your indexes now.
>> Do a level 0 backup (even if it=E2=80=99s to /dev/null)
>>
>> How many files you choose to use for the external table is up to you.
>> I = use a multiple or factor of the #cpus.
>>
>> This is waaaay faster than an unload statement.
>>
>> cheers
>> j.
>>
>>> On Mar 3, 2018, at 6:46 PM, jorge valenzuela <jorgervt@gmail.com> =
>> wrote:
>>> =20
>>> I think I will unload the table, will recreate and load again.=20 In
>>> my case I will only add a char(1) column with default value of "D",
>>> =
>> so, the=20
>>> instrucci=C3=B3n will be=20
>>> =20
>>> unload to filename=20
>>> select * from table, "D" ?=20
>>> Thanks in advance.=20
>>> =20
>>>> El 03/03/2018, a las 10:36, Mike Walker
>>>> <mike@advancedatatools.com>=20=
>>
>>> escribi=C3=B3:=20
>>>> =20
>>>> This will happen when you're doing a "slow alter" and all the pages
>>>> =
>> of the=20
>>>> table need to be rewritten.=20
>>>> =20
>>>> You could try changing the table to RAW (as long as you are not =
>> replicating)=20
>>>> and trying again, but you will need to make sure that you have
>>>> plenty =
>> of=20
>>>> room in the dbspace for a copy of the table to be stored while the
>>>> =
>> change is=20
>>>> made.=20
>>>> =20
>>>> You could add also add more logs, but this might be more trouble
>>>> than =
>> it's=20
>>>> worth.=20
>>>> =20
>>>> As Jack already recommended, the easiest thing to do is likely to =
>> unload the=20
>>>> table, recreate the table with the updated definition and reload
>>>> it. =
>> If you=20
>>>> are adding or dropping a column, then I would suggest unloading the
>>>> =
>> table in=20
>>>> the NEW format (e.g. with a blank value in the position of the new
>>>> =
>> column)=20
>>>> so that you can load it back in easily. Look at using external
>>>> tables =
>> for=20
>>>> the unload for the best performance. During the load, to avoid
>>>> long=20=
>>
>>>> transaction errors again, load the table as RAW or use a utility
>>>> like =
>> dbload=20
>>>> so that it commits regularly. Also leave off indexes and
>>>> constraints =
>> until=20
>>>> the table is loaded and recreate them after.=20
>>>> =20
>>>> Mike=20
>>>> =20
>>>> -----Original Message-----=20
>>>> From: ids-bounces@iiug.org [mailto:ids-bounces@iiug.org] On Behalf
>>>> Of =
>> jorge=20
>>>> valenzuela=20
>>>> Sent: Saturday, March 03, 2018 9:38 AM=20
>>>> To: ids@iiug.org=20
>>>> Subject: Long transaction aborted in alter table [40777]=20
>>>> =20
>>>> H,=20
>>>> I trying to add a column to a table but I get the long transaction
>>>> =
>> aborted,=20
>>>> what can I do?=20
>>>> Thanks in advance.=20
>>>> =20
>>>> =
>> *********************************************************************
>> *****=
>> **=20
>>>> ***=20
>>>> Forum Note: Use "Reply" to post a response in the discussion
>>>> forum.=20=
>>
>>>> =20
>>>> =20
>>>> =20
>>> =
>> *********************************************************************
>> *****=
>> *****=20
>>>> Forum Note: Use "Reply" to post a response in the discussion
>>>> forum.=20=
>>
>>>> =20
>>> =20
>>> =20
>>> =
>> *********************************************************************
>> *****=
>> *****=20
>>> Forum Note: Use "Reply" to post a response in the discussion
>>> forum.=20=
>>
>>> =20
>>
>>
>>
>
****************************************************************************
***
>> Forum Note: Use "Reply" to post a response in the discussion forum.
>>
>
>
>
****************************************************************************
***
> Forum Note: Use "Reply" to post a response in the discussion forum.
>

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