Обсуждение: idle in transaction process
Hi All
I am using postgres-8.4.0 on a cluster setup with slony-2.0.4 being used for replication.
Recently , I saw a "idle in transaction" postgres process as below.
postgres 13052 14742 0 May13 ? 00:00:00 postgres: slon abc 172.16.1.1(49017) idle in transaction
I wonder what could have lead to that hung postgres process . I googled about it a lot and they say that it could be
because of abrupt netwotk issue between slony and postgres . But in my case slon was connected
to its local postgres database. So, network wont be an issue in this case . What else could be the reason for
this hung process ? What should I do to come over this kind of issue in future. I think this hung process would have
taken locks on various tables. I wonder if killing the "idle in transaction" process would cause the locks on the tables
to be released or not. Can anyone please help me on that.
Thanks in Advance .
Tamanna
Best Regards,
Abbas
On Mon, Aug 15, 2011 at 11:14 PM, tamanna madaan <tamanna.madaan@globallogic.com> wrote:
Hi AllI am using postgres-8.4.0 on a cluster setup with slony-2.0.4 being used for replication.Recently , I saw a "idle in transaction" postgres process as below.postgres 13052 14742 0 May13 ? 00:00:00 postgres: slon abc 172.16.1.1(49017) idle in transactionI wonder what could have lead to that hung postgres process . I googled about it a lot and they say that it could bebecause of abrupt netwotk issue between slony and postgres . But in my case slon was connectedto its local postgres database. So, network wont be an issue in this case . What else could be the reason forthis hung process ? What should I do to come over this kind of issue in future. I think this hung process would havetaken locks on various tables. I wonder if killing the "idle in transaction" process would cause the locks on the tablesto be released or not. Can anyone please help me on that.
Of course it is a slon process if it is not due to a network issue, then might be any of your scripts, if not you can try by restarting the slon process on origin.
Abbas.
Abbas.
Thanks in Advance .Tamanna
Hi
Yes , restarting the slon resolves the issue. But. there are other processes also in my application which connect to postgres . Those processes can also cause "idle in transaction" postgres connection . So, I was wondering if I can make use of tcp_keepalives_idle , tcp_keepalives_interval and tcp_keepalives_count configurations in postgresql.conf to get rid of this "idle in transaction" process after a certain amount of time . Will this help or not ??
Thanks...
Tamanna
On Tue, Aug 16, 2011 at 11:56 AM, Abbas <abbas.dba@gmail.com> wrote:
Best Regards,
AbbasOn Mon, Aug 15, 2011 at 11:14 PM, tamanna madaan <tamanna.madaan@globallogic.com> wrote:Hi AllI am using postgres-8.4.0 on a cluster setup with slony-2.0.4 being used for replication.Recently , I saw a "idle in transaction" postgres process as below.postgres 13052 14742 0 May13 ? 00:00:00 postgres: slon abc 172.16.1.1(49017) idle in transactionI wonder what could have lead to that hung postgres process . I googled about it a lot and they say that it could bebecause of abrupt netwotk issue between slony and postgres . But in my case slon was connectedto its local postgres database. So, network wont be an issue in this case . What else could be the reason forthis hung process ? What should I do to come over this kind of issue in future. I think this hung process would havetaken locks on various tables. I wonder if killing the "idle in transaction" process would cause the locks on the tablesto be released or not. Can anyone please help me on that.Of course it is a slon process if it is not due to a network issue, then might be any of your scripts, if not you can try by restarting the slon process on origin.
Abbas.Thanks in Advance .Tamanna
--
Tamanna Madaan | Associate Consultant | GlobalLogic Inc.
Leaders in Software R&D Services
ARGENTINA | CHILE | CHINA | GERMANY | INDIA | ISRAEL | UKRAINE | UK | USA
Office: +0-120-406-2000 x 2971
www.globallogic.com
Can anyone please suggest me on this .
Thanks..
Tamanna
--
Tamanna Madaan | Associate Consultant | GlobalLogic Inc.
Leaders in Software R&D Services
ARGENTINA | CHILE | CHINA | GERMANY | INDIA | ISRAEL | UKRAINE | UK | USA
Office: +0-120-406-2000 x 2971
www.globallogic.com
Thanks..
Tamanna
On Thu, Aug 18, 2011 at 2:47 PM, tamanna madaan <tamanna.madaan@globallogic.com> wrote:
HiYes , restarting the slon resolves the issue. But. there are other processes also in my application which connect to postgres . Those processes can also cause "idle in transaction" postgres connection . So, I was wondering if I can make use of tcp_keepalives_idle , tcp_keepalives_interval and tcp_keepalives_count configurations in postgresql.conf to get rid of this "idle in transaction" process after a certain amount of time . Will this help or not ??Thanks...TamannaOn Tue, Aug 16, 2011 at 11:56 AM, Abbas <abbas.dba@gmail.com> wrote:
Best Regards,
AbbasOn Mon, Aug 15, 2011 at 11:14 PM, tamanna madaan <tamanna.madaan@globallogic.com> wrote:Hi AllI am using postgres-8.4.0 on a cluster setup with slony-2.0.4 being used for replication.Recently , I saw a "idle in transaction" postgres process as below.postgres 13052 14742 0 May13 ? 00:00:00 postgres: slon abc 172.16.1.1(49017) idle in transactionI wonder what could have lead to that hung postgres process . I googled about it a lot and they say that it could bebecause of abrupt netwotk issue between slony and postgres . But in my case slon was connectedto its local postgres database. So, network wont be an issue in this case . What else could be the reason forthis hung process ? What should I do to come over this kind of issue in future. I think this hung process would havetaken locks on various tables. I wonder if killing the "idle in transaction" process would cause the locks on the tablesto be released or not. Can anyone please help me on that.Of course it is a slon process if it is not due to a network issue, then might be any of your scripts, if not you can try by restarting the slon process on origin.
Abbas.Thanks in Advance .Tamanna
--
Tamanna Madaan | Associate Consultant | GlobalLogic Inc.
Leaders in Software R&D Services
ARGENTINA | CHILE | CHINA | GERMANY | INDIA | ISRAEL | UKRAINE | UK | USA
Office: +0-120-406-2000 x 2971
www.globallogic.com
--
Tamanna Madaan | Associate Consultant | GlobalLogic Inc.
Leaders in Software R&D Services
ARGENTINA | CHILE | CHINA | GERMANY | INDIA | ISRAEL | UKRAINE | UK | USA
Office: +0-120-406-2000 x 2971
www.globallogic.com
On 08/18/11 2:17 AM, tamanna madaan wrote: > Yes , restarting the slon resolves the issue. But. there are other > processes also in my application which connect to postgres . Those > processes can also cause "idle in transaction" postgres connection . > So, I was wondering if I can make use of tcp_keepalives_idle , > tcp_keepalives_interval and tcp_keepalives_count configurations in > postgresql.conf to get rid of this "idle in transaction" process after > a certain amount of time . Will this help or not ?? Idle In Transaction means that the process has issued a BEGIN to start a transaction but is sitting there doing nothing. if they stay that way for hours, they block vacuum from freeing any tuples since the start of the oldest transaction.. Long running Idle in Transaction processes generally indicate a error in your program design. -- john r pierce N 37, W 122 santa cruz ca mid-left coast
On Sun, Aug 21, 2011 at 10:52 PM, tamanna madaan <tamanna.madaan@globallogic.com> wrote: > Can anyone please suggest me on this . Both the PostgreSQL and Slony versions you are running have known bugs that cause problems. Update them first and see if your problem goes away.