Thread: query crashes backend - cvs
interesting that
select * from work_flats where (METRO_ID = 81 or METRO_ID = 82) and DISTRICT_ID < 11;
crashes backend
pqReadData() -- backend closed the channel unexpectedly.
This probably means the backend terminated abnormally before or while processing the request.
We have lost the connection to the backend, so further processing is impossible. Terminating.
while
select * from work_flats where METRO_ID = 81 or METRO_ID = 82 and DISTRICT_ID < 11;
works ok.
This happens with latest cvs, 6.3.2 has no problem.
Regards,
Oleg
_____________________________________________________________
Oleg Bartunov, sci.researcher, hostmaster of AstroNet,
Sternberg Astronomical Institute, Moscow University (Russia)
Internet: oleg@sai.msu.su, http://www.sai.msu.su/~megera/
phone: +007(095)939-16-83, +007(095)939-23-83
This query crashes the backend too.
template1=> select @1;
pqReadData() -- backend closed the channel unexpectedly.
This probably means the backend terminated abnormally before or while processing the request.
We have lost the connection to the backend, so further processing is impossible. Terminating.
With 6.3.2 the same query produces:
test=> select @1;
ERROR: Can't find left op: @ for type 23
--
Tatsuo Ishii
t-ishii@sra.co.jp
> select * from work_flats where (METRO_ID = 81 or METRO_ID = 82) and
> DISTRICT_ID < 11;
> crashes backend
> pqReadData() -- backend closed the channel unexpectedly.
> while
> select * from work_flats where METRO_ID = 81 or METRO_ID = 82 and
> DISTRICT_ID < 11;
> works ok.
>
> This happens with latest cvs, 6.3.2 has no problem.
postgres=> select * from t where (METRO_ID = 81 or METRO_ID = 82) and
postgres-> DISTRICT_ID < 11;
metro_id|district_id
--------+-----------
81| 1
82| 2
(2 rows)
More details please...
- Tom
Ok,
create table t0 ( a_id int4 NOT NULL, a varchar(10), a_t1_id int4);
create index a_id_t0 on t0 (a_id);
create index a_t1_id_t0 on t0 (a_t1_id);
COPY t0 FROM STDIN USING DELIMITERS '|';
1|at0|0
2|at0|0
\.
test=> \d t0
Table = t0
+----------------------------------+----------------------------------+-------+
| Field | Type | Length|
+----------------------------------+----------------------------------+-------+
| a_id | int4 not null | 4 |
| a | varchar() | 10 |
| a_t1_id | int4 | 4 |
+----------------------------------+----------------------------------+-------+
Indices: a_id_t0
a_t1_id_t0
test=> select * from t0 where a_id = 1 or a_id = 2 and a_t1_id < 1;
a_id|a |a_t1_id
----+---+-------
1|at0| 0
2|at0| 0
(2 rows)
test=> select * from t0 where (a_id = 1 or a_id = 2) and a_t1_id < 1;
pqReadData() -- backend closed the channel unexpectedly.
This probably means the backend terminated abnormally before or while processing the request.
We have lost the connection to the backend, so further processing is impossible. Terminating.
This is Linux box, running postgres from cvs
Linux om 2.1.117 #2 Tue Aug 25 21:05:29 MSD 1998 i586
Kernel modules 2.1.121
Gnu C egcs-2.91.57
Binutils 2.9.1.0.7
Linux C Library 5.4.46
Dynamic Linker (ld.so) 1.9.9
Linux C++ Library 27.1.4
Procps 1.2.7
Mount 2.8a
Net-tools (1998-03-02)
Kbd
Sh-utils 1.16
This happens also on another Linux box:
Linux dv 2.0.34 #7 Wed Aug 26 14:05:30 MSD 1998 i586 unknown
Kernel modules 2.1.71
Gnu C 2.7.2.3
Binutils 2.8.1.0.23
Linux C Library 5.4.44
Dynamic Linker (ld.so) 1.9.7
Linux C++ Library 27.2.8
Procps 1.2.6
Procinfo 12
Mount 2.7l
Net-tools 1.432.
Kbd 0.94
Sh-utils 1.16
Again, 6.3.2 works fine.
Also, cvs has a problem with vacuum analyze
test=> vacuum analyze t0;
ERROR: cannot write block -1 of [] blind
test=> \q
11:53[om]:~/bin>psql test
Welcome to the POSTGRESQL interactive sql monitor:
Please read the file COPYRIGHT for copyright terms of POSTGRESQL
type \? for help on slash commands
type \q to quit
type \g or terminate with semicolon to execute query
You are currently connected to the database: test
test=> \d t0
pqReadData() -- backend closed the channel unexpectedly.
This probably means the backend terminated abnormally before or while processing the request.
I run postmaster as 'postmaster -i -S -D/usr/local/pgsql/data/ -o -Fe'
(note, no -B 1024 now, because number of buffers > 128 causes
vacuum analyze crash also, I've already posted several day s ago)
Regards,
Oleg
On Wed, 16 Sep 1998, Thomas G. Lockhart wrote:
> Date: Wed, 16 Sep 1998 05:14:13 +0000
> From: "Thomas G. Lockhart" <lockhart@alumni.caltech.edu>
> To: Oleg Bartunov <oleg@sai.msu.su>
> Cc: pgsql-hackers@postgreSQL.org
> Subject: Re: [HACKERS] query crashes backend - cvs
>
> > select * from work_flats where (METRO_ID = 81 or METRO_ID = 82) and
> > DISTRICT_ID < 11;
> > crashes backend
> > pqReadData() -- backend closed the channel unexpectedly.
> > while
> > select * from work_flats where METRO_ID = 81 or METRO_ID = 82 and
> > DISTRICT_ID < 11;
> > works ok.
> >
> > This happens with latest cvs, 6.3.2 has no problem.
>
> postgres=> select * from t where (METRO_ID = 81 or METRO_ID = 82) and
> postgres-> DISTRICT_ID < 11;
> metro_id|district_id
> --------+-----------
> 81| 1
> 82| 2
> (2 rows)
>
> More details please...
>
> - Tom
>
_____________________________________________________________
Oleg Bartunov, sci.researcher, hostmaster of AstroNet,
Sternberg Astronomical Institute, Moscow University (Russia)
Internet: oleg@sai.msu.su, http://www.sai.msu.su/~megera/
phone: +007(095)939-16-83, +007(095)939-23-83
> interesting that > select * from work_flats where (METRO_ID = 81 or METRO_ID = 82) and DISTRICT_ID < 11; > crashes backend > pqReadData() -- backend closed the channel unexpectedly. > This probably means the backend terminated abnormally before or while processing the request. > We have lost the connection to the backend, so further processing is impossible. Terminating. > while > select * from work_flats where METRO_ID = 81 or METRO_ID = 82 and DISTRICT_ID < 11; > works ok. > > This happens with latest cvs, 6.3.2 has no problem. I can't reproduce this. Can you send a reproducable example with data, or tell me what columns have indexes. -- Bruce Momjian | 830 Blythe Avenue maillist@candle.pha.pa.us | Drexel Hill, Pennsylvania 19026 http://www.op.net/~candle | (610) 353-9879(w) + If your life is a hard drive, | (610) 853-3000(h) + Christ can be your backup. |
> interesting that > select * from work_flats where (METRO_ID = 81 or METRO_ID = 82) and DISTRICT_ID < 11; > crashes backend > pqReadData() -- backend closed the channel unexpectedly. > This probably means the backend terminated abnormally before or while processing the request. > We have lost the connection to the backend, so further processing is impossible. Terminating. > while > select * from work_flats where METRO_ID = 81 or METRO_ID = 82 and DISTRICT_ID < 11; > works ok. > > This happens with latest cvs, 6.3.2 has no problem. Never mind. I have a reproducable example now. -- Bruce Momjian | 830 Blythe Avenue maillist@candle.pha.pa.us | Drexel Hill, Pennsylvania 19026 http://www.op.net/~candle | (610) 353-9879(w) + If your life is a hard drive, | (610) 853-3000(h) + Christ can be your backup. |