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IDS Forum

Re: Long transaction aborted in alter table

Posted By: jorge valenzuela
Date: Sunday, 4 March 2018, at 3:27 p.m.

In Response To: Re: Long transaction aborted in alter table (Jack Parker)

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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