Re: auto_explain logs ERROR: 08P01 for every query using bindvariable

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От Ted Liu
Тема Re: auto_explain logs ERROR: 08P01 for every query using bindvariable
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Msg-id 1612134292.2041998.1580486077284@mail.yahoo.com
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Ответ на Re: auto_explain logs ERROR: 08P01 for every query using bind variable  (Jeff Janes <jeff.janes@gmail.com>)
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Hi Jeff,

Thank you for looking into this issue.

Our Postgres version is 11.5. The auto_explain settings are 

                name                | setting
------------------------------------+---------
 auto_explain.log_analyze           | off
 auto_explain.log_buffers           | off
 auto_explain.log_format            | text
 auto_explain.log_min_duration      | 190000
 auto_explain.log_nested_statements | off
 auto_explain.log_timing            | on
 auto_explain.log_triggers          | off
 auto_explain.log_verbose           | off
 auto_explain.sample_rate           | 1
(9 rows)

The client is java using jdbc. 

Thanks,

Ted

On Friday, January 31, 2020, 9:52:51 AM EST, Jeff Janes <jeff.janes@gmail.com> wrote:


On Fri, Jan 31, 2020 at 2:14 AM Ted Liu <ted_liu@yahoo.com> wrote:
To whom it may concern,

For performance and security, most of our queries use bind variables. We also implemented auto_explain for tracking down un-optimized queries. Our database supports a large application. During the work-hours, there are 30,000+ queries executed every hour. PostgreSQL logs rotates every hour and each log contains 30,000+ error message like below.

2020-01-27 00:00:03 UTC:xxx.xx.0.189(35556):xxxxxx@xxxxxxdb:[130756]:ERROR:  ERROR: 08P01: bind message supplies 0 parameters, but prepared statement "..." requires 1 
2020-01-27 00:00:03 UTC:xxx.xx.0.189(35558):xxxxxx@xxxxxxdb:[130756]:LOCATION:  exec_bind_message, postgres.c:1601
2020-01-27 00:00:03 UTC:xxx.xx.0.189(35558):xxxxxx@xxxxxxdb:[130756]:STATEMENT:  EXPLAIN select ...,...,..,... from ... where ....=$1

These error messages are really overwhelming to us and they are not useful at all. In our opinion, these error messages should not be logged. 

I agree they shouldn't be logged.  And I don't get such messages when using auto_explain with something like `pgbench -M prepared`.

What version are you using?  What settings are you using for auto_explain?  What is your client language/driver?  Maybe the client is doing something weird like sending duplicate binds?

Cheers,

Jeff

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