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(GSFC-671.0)[ADNET Affiliate]" , "pgsql-general@postgresql.org" Subject: Re: Why is an error not thrown when the time exceeds the lock timeout for an ExclusiveLock on a transaction ? Thread-Topic: Why is an error not thrown when the time exceeds the lock timeout for an ExclusiveLock on a transaction ? 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boundary="_005_BY1PR19MB775170360F6B063061F02709AEBF2BY1PR19MB7751namp_"; type="multipart/alternative" MIME-Version: 1.0 X-OriginatorOrg: sct-15-20-4755-11-msonline-outlook-e7757.templateTenant X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: BY1PR19MB7751.namprd19.prod.outlook.com X-MS-Exchange-CrossTenant-RMS-PersistedConsumerOrg: 00000000-0000-0000-0000-000000000000 X-MS-Exchange-CrossTenant-Network-Message-Id: 6cf57444-6106-4017-c6f5-08dd7ea9b793 X-MS-Exchange-CrossTenant-originalarrivaltime: 18 Apr 2025 18:49:15.0440 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 84df9e7f-e9f6-40af-b435-aaaaaaaaaaaa X-MS-Exchange-CrossTenant-rms-persistedconsumerorg: 00000000-0000-0000-0000-000000000000 X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH0PR19MB5178 List-Id: List-Help: List-Subscribe: List-Post: List-Owner: List-Archive: Archived-At: Precedence: bulk --_005_BY1PR19MB775170360F6B063061F02709AEBF2BY1PR19MB7751namp_ Content-Type: multipart/alternative; boundary="_000_BY1PR19MB775170360F6B063061F02709AEBF2BY1PR19MB7751namp_" --_000_BY1PR19MB775170360F6B063061F02709AEBF2BY1PR19MB7751namp_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable display server side postgresql.conf varables from postgresql.conf Server-Side Timeout Configuration: 1. 1. statement_timeout: 2. 2. lock_timeout: 3. 3. idle_in_transaction_session_timeout: Then dump the client-side timeout configuration thru Node.js code Node.js client.query(sql, { timeout: }). 2. Wrap Queries with a try...catch Block: 4. something like this should work thru javascript Node.js const { Pool } =3D require('pg'); const pool =3D new Pool({ connectionString: 'your_connection_string' }); async function executeQuery(sql) { const client =3D await pool.connect(); try { const result =3D await client.query(sql, { timeout: 5000 }); // Timeout aft= er 5 seconds return result; } catch (err) { console.error('Error executing query:', err); throw err; // Re-throw to propagate the error } finally { client.release(); } } if none of the server timeout parameters or client side timeout debug state= ments help you identify you may need to install pg_timeout extension to Postgres https://github.com/pierreforstmann/pg_timeout HTH ________________________________ From: Mansky, Edmund J. (GSFC-671.0)[ADNET Affiliate] Sent: Friday, April 18, 2025 1:28 PM To: pgsql-general@postgresql.org Cc: Mansky, Edmund J. (GSFC-671.0)[ADNET Affiliate] Subject: Why is an error not thrown when the time exceeds the lock timeout = for an ExclusiveLock on a transaction ? Hi Everyone, I have an SQL that updates a table in our database. The SQL in question is: UPDATE public.sum_partn_alloc AS T1 SET effective_date =3D to_char(CURRENT_= TIMESTAMP + interval '6 days', 'YYYYMMDDHH24MI') FROM public.sum_main AS T2 WHERE T1.status !=3D 8 AND (T1.effective_date =3D '0' OR CURRENT_TI= MESTAMP + interval '3 days' > to_timestamp(T1.effective_date, 'YYYYMMDDHH2= 4MI')) AND T1.ds_index IN (1741052236) AND T1.ds_index =3D T2.ds_index AND= T2.online_status =3D 'Y' where the number in BOLD in the list can be just a single number, or a long= list of numbers (20-50 or so). Normally, this SQL is executed without problem thousands of times a day. Then, we see at certain times when that SQL exceeds the timeout for the Sha= reLock on the transaction. No error is thrown from the DB and processing on= the driving Python script stops. I've seen this in the case of a single number in the list, or a long list o= f 20-50 numbers or so. I see in the log at that point : process 683860 still waiting for ShareLock= on transaction 492777941 after 1000.140 ms while updating tuple (1282991= ,25) in relation "sum_partn_alloc" The Postgres server (12.22), running on RHEL 8.10 is configured with a defa= ult lock timeout of 1 sec. Why is Postgres not throwing an error when the ShareLock time has exceeded = 1 sec. ? The Python script driving this SQL never gets an error from Postgres in it'= s exception block, and hence the script simply stops at that point and proc= essing stops. Are there other parameters one can set in the configuration that would resu= lt in the Python script getting an error from Postgres so that this case ca= n be handled and processing continues ? Any ideas or tips would be greatly appreciated. Thanks, --Ed [signature_1379146699] Ed Mansky Software Engineer SDAC / VSO NASA Goddard Space Flight Center ADNET SYSTEMS, Inc. 8800 Greenbelt Rd, Greenbelt MD 20771 edmund.j.mansky@nasa.gov --_000_BY1PR19MB775170360F6B063061F02709AEBF2BY1PR19MB7751namp_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable
display server side postgresql.conf varables from postgresql.conf
Server-Side Timeout Configuration:=
  1. 1. statement_timeout:
  3. 3. idle_in_transaction_session_ti= meout:

    Then dump the client-side timeout configuration thru Node.js code

    Node.js
    client.query(sql, { timeout: <milliseconds> }). 
    2. Wrap Queries with a try..= .catch Block:

  4. something like this should work thru java= script Node.js 
    const { Pool } =3D require('pg');

    const pool =3D new Pool({
    connectionString: 'your_connection_string'
    });

    async function executeQuery(sql) {
    const client =3D await pool.connect();
    try {
    const result =3D await client.query(sql, { timeout: 5000 });= // Timeout after 5 seconds
    return result;
    } catch (err) {
    console.error('Error executing query:', err);
    throw err; // Re-throw to propagate the error
    } finally {
    client.release();
    }
    }

    if none of the server timeout parameters or client side timeout debug state= ments help you identify
    you may need to install pg_timeout extension to Postgres
    https://github.com/pierreforstmann/pg_t= imeout

    HTH
From: Mansky, Edmund J. (GS= FC-671.0)[ADNET Affiliate] <edmund.j.mansky@nasa.gov>
Sent: Friday, April 18, 2025 1:28 PM
To: pgsql-general@postgresql.org <pgsql-general@postgresql.org>= ;
Cc: Mansky, Edmund J. (GSFC-671.0)[ADNET Affiliate] <edmund.j.man= sky@nasa.gov>
Subject: Why is an error not thrown when the time exceeds the lock t= imeout for an ExclusiveLock on a transaction ?
 

Hi Everyone,

 

I have an SQL that updates a table in our database. The SQL in quest= ion is:

 

UPDATE public.sum_partn_alloc AS T1 SET effective_date =3D to_char(C= URRENT_TIMESTAMP + interval '6 days', 'YYYYMMDDHH24MI') FROM public.sum_mai= n AS T2

        WHERE T1.status !=3D 8 AN= D (T1.effective_date =3D '0' OR CURRENT_TIMESTAMP + interval '3 days' >&= nbsp; to_timestamp(T1.effective_date, 'YYYYMMDDHH24MI'))

        AND T1.ds_index IN (17410= 52236) AND T1.ds_index =3D T2.ds_index AND T2.online_status =3D 'Y'<= /p>

 

where the number in BOLD in the list can be just a single number, or= a long list of numbers (20-50 or so).

 

Normally, this SQL is executed without problem thousands of times a = day.

 

Then, we see at certain times when that SQL exceeds the timeout for = the ShareLock on the transaction. No error is thrown from the DB and proces= sing on the driving Python script stops.

I've seen this in the case of a single number in the list, or a long= list of 20-50 numbers or so.

 

I see in the log at that point : process 683860 still waiting for Sh= areLock on transaction 492777941 after 1000.140 ms

           &n= bsp;            = ;            &n= bsp;         while updating tuple (= 1282991,25) in relation "sum_partn_alloc"

 

The Postgres server (12.22), running on RHEL 8.10 is configured with= a default lock timeout of 1 sec.

 

Why is Postgres not throwing an error when the ShareLock time has ex= ceeded 1 sec. ?

 

The Python script driving this SQL never gets an error from Postgres= in it's exception block, and hence the script simply stops at that point a= nd processing stops.

 

Are there other parameters one can set in the configuration that wou= ld result in the Python script getting an error from Postgres so that this = case can be handled and processing continues ?

 

Any ideas or tips would be greatly appreciated.

 

Thanks,

 

--Ed

 

 

 

 

 

 

3D"signature_1379146699"

3D"signature_3709253912"

Ed Mansk= y

Software = Engineer

SDAC / VS= O

NASA Godd= ard Space Flight Center

ADNET SYSTEM= S, Inc.

8800 Greenbe= lt Rd, Greenbelt MD 20771

edmund.j.mansky@nasa.gov

 

 

 

 

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