Re: something weird happened - can select by column value although column value exist

2018-10-11 Thread Tom Lane 
Ron  writes:
> On 10/11/2018 03:17 PM, Dmitry O Litvintsev wrote:
>> Today the following happened:
>> < 2018-10-11 13:31:52.587 CDT >ERROR:  insert or update on table "file" 
>> violates foreign key constraint "$1"
>> < 2018-10-11 13:31:52.587 CDT >DETAIL:  Key (volume)=(155303) is not present 
>> in table "volume".
>> [ but it is present ]
>>
>> What is this? Version 9.3.9,. running on Linux RH6.

> Index corruption?  Maybe rebuild the FK.

Yeah, I'd suspect index corruption as well, particularly seeing that this
is a three-year-old point release in a branch that had more than its share
of data corruption issues.  My suggestion is first update to 9.3.latest,
then reindex.

BTW, 9.3.x will be EOL next month, so you should be thinking about getting
onto a later release branch ...

regards, tom lane

Re: something weird happened - can select by column value although column value exist

2018-10-11 Thread Ron 

On 10/11/2018 03:17 PM, Dmitry O Litvintsev wrote:

Hi,

Today the following happened:

Found this error in my production log:

< 2018-10-11 13:31:52.587 CDT >ERROR:  insert or update on table "file" violates foreign 
key constraint "$1"
< 2018-10-11 13:31:52.587 CDT >DETAIL:  Key (volume)=(155303) is not present in table 
"volume".
< 2018-10-11 13:31:52.587 CDT >STATEMENT:
 INSERT INTO file 
(sanity_crc,uid,pnfs_id,crc,deleted,cache_mod_time,drive,volume,sanity_size,cache_status,gid,location_cookie,cache_location,original_library,bfid,pnfs_path,size)
 VALUES (
 4002229874,0,'',256655919,'u','2018-10-11 13:31:52','',(SELECT 
id FROM volume where label='A'),65536,'B',0,'C','D','E','F','',197243) 
RETURNING *

file table references volume table on file.volume = volume.id and file.volume 
is FK to volume.id. I doctored the query for privacy replacing string values 
with 'A', 'B'. ...

(Queries similar to the above quoted  are executed by an application and run 
thousand of times every day for years)

So, the problem:

SELECT id FROM volume where label='A';
id

  155303
(1 row)

BUT:

select * from volume where id = 155303;
  ...
(0 rows)

?!

id is a sequence:

id| integer | not null default 
nextval(('volume_seq'::text)::regclass)


This entry id = 155303 has existed for some time and has a lot of existing file 
entries holding
FK reference to volume id = 155303

I "fixed" the issue just by:

update volume set id  = 155303 where label='A';

BUT It did not work  right away. Meaning I did this once:

update volume set id  = 155303 where label='A';

no effect.

I did it again, I also did it;

update volume set id = (select id from volume where  label='A');

and then again

update volume set id  = 155303 where label='A';

eventually it worked. Now,


select count(*) from volume where label='A';
  count
---
  1
(1 row)


What is this? Version 9.3.9,. running on Linux RH6.


Index corruption?  Maybe rebuild the FK.


--
Angular momentum makes the world go 'round.

something weird happened - can select by column value although column value exist

2018-10-11 Thread Dmitry O Litvintsev 
Hi, 

Today the following happened:

Found this error in my production log:

< 2018-10-11 13:31:52.587 CDT >ERROR:  insert or update on table "file" 
violates foreign key constraint "$1"
< 2018-10-11 13:31:52.587 CDT >DETAIL:  Key (volume)=(155303) is not present in 
table "volume".
< 2018-10-11 13:31:52.587 CDT >STATEMENT:  
INSERT INTO file 
(sanity_crc,uid,pnfs_id,crc,deleted,cache_mod_time,drive,volume,sanity_size,cache_status,gid,location_cookie,cache_location,original_library,bfid,pnfs_path,size)
 VALUES (
4002229874,0,'',256655919,'u','2018-10-11 13:31:52','',(SELECT 
id FROM volume where label='A'),65536,'B',0,'C','D','E','F','',197243) 
RETURNING *

file table references volume table on file.volume = volume.id and file.volume 
is FK to volume.id. I doctored the query for privacy replacing string values 
with 'A', 'B'. ... 

(Queries similar to the above quoted  are executed by an application and run 
thousand of times every day for years) 

So, the problem:

SELECT id FROM volume where label='A';
   id   

 155303
(1 row)

BUT:

select * from volume where id = 155303;
 ...
(0 rows)

?!

id is a sequence:

id| integer | not null default 
nextval(('volume_seq'::text)::regclass)


This entry id = 155303 has existed for some time and has a lot of existing file 
entries holding 
FK reference to volume id = 155303

I "fixed" the issue just by:

update volume set id  = 155303 where label='A';

BUT It did not work  right away. Meaning I did this once:

update volume set id  = 155303 where label='A';

no effect. 

I did it again, I also did it;

update volume set id = (select id from volume where  label='A');

and then again 

update volume set id  = 155303 where label='A';

eventually it worked. Now, 


select count(*) from volume where label='A';
 count 
---
 1
(1 row)


What is this? Version 9.3.9,. running on Linux RH6.

Thanks,
Dmitry