# SQL connection exception continuing in Logstash

**URL:** <https://discuss.elastic.co/t/sql-connection-exception-continuing-in-logstash/74641>\
**Category:** Logstash\
**Created:** [February 10, 2017, 11:12am UTC](https://discuss.elastic.co/t/sql-connection-exception-continuing-in-logstash/74641 "2017-02-10T11:12:24Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![elasticheart](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/elasticheart/32/65189_2.png) [@elasticheart](https://discuss.elastic.co/u/elasticheart)\
**Post date:** [February 10, 2017, 11:12am UTC](https://discuss.elastic.co/t/sql-connection-exception-continuing-in-logstash/74641/1 "2017-02-10T11:12:24Z")

</div>

Hi,

I am using jdbc input in Logstash, to fetch log entries from two different postgres tables. The queries are scheduled o run every hour, which fetched new nows only. Today, I am getting no entries in my elasticsearch and when I analyzed Logstash log trace, I found this;

```
[2017-02-10T04:00:27,861][ERROR][logstash.inputs.jdbc] Java::ComEdbUtil::PSQLException: An I/O error occurred while sending to the backend.: SELECT * FROM adminslogs where logtime > (current_timestamp - INTERVAL '1' HOUR)
[2017-02-10T04:00:27,865][WARN][logstash.inputs.jdbc] Exception when executing JDBC query {:exception=>#<Sequel::DatabaseError: Java::ComEdbUtil::PSQLException: An I/O error occurred while sending to the backend.>}
[2017-02-10T04:00:38,096][ERROR][logstash.inputs.jdbc] Java::ComEdbUtil::PSQLException: An I/O error occurred while sending to the backend.: SELECT * FROM userslogs where logtime > (current_timestamp - INTERVAL '1' HOUR)
[2017-02-10T04:00:38,097][WARN][logstash.inputs.jdbc] Exception when executing JDBC query {:exception=>#<Sequel::DatabaseError: Java::ComEdbUtil::PSQLException: An I/O error occurred while sending to the backend.>}
[2017-02-10T04:45:00,276][WARN][logstash.inputs.jdbc] Exception when executing JDBC query {:exception=>#<Sequel::DatabaseError: Java::ComEdbUtil::PSQLException: This connection has been closed.>}
[2017-02-10T04:45:00,276][WARN][logstash.inputs.jdbc] Exception when executing JDBC query {:exception=>#<Sequel::DatabaseError: Java::ComEdbUtil::PSQLException: This connection has been closed.>}
[2017-02-10T05:45:00,101][WARN][logstash.inputs.jdbc] Exception when executing JDBC query {:exception=>#<Sequel::DatabaseError: Java::ComEdbUtil::PSQLException: This connection has been closed.>}
[2017-02-10T05:45:00,101][WARN][logstash.inputs.jdbc] Exception when executing JDBC query {:exception=>#<Sequel::DatabaseError: Java::ComEdbUtil::PSQLException: This connection has been closed.>}
[2017-02-10T06:45:00,190][WARN][logstash.inputs.jdbc] Exception when executing JDBC query {:exception=>#<Sequel::DatabaseError: Java::ComEdbUtil::PSQLException: This connection has been closed.>}
[2017-02-10T06:45:00,190][WARN][logstash.inputs.jdbc] Exception when executing JDBC query {:exception=>#<Sequel::DatabaseError: Java::ComEdbUtil::PSQLException: This connection has been closed.>}
[2017-02-10T07:45:00,016][WARN][logstash.inputs.jdbc] Exception when executing JDBC query {:exception=>#<Sequel::DatabaseError: Java::ComEdbUtil::PSQLException: This connection has been closed.>}
[2017-02-10T07:45:00,016][WARN][logstash.inputs.jdbc] Exception when executing JDBC query {:exception=>#<Sequel::DatabaseError: Java::ComEdbUtil::PSQLException: This connection has been closed.>}
[2017-02-10T08:45:00,180][WARN][logstash.inputs.jdbc] Exception when executing JDBC query {:exception=>#<Sequel::DatabaseError: Java::ComEdbUtil::PSQLException: This connection has been closed.>}
[2017-02-10T08:45:00,180][WARN][logstash.inputs.jdbc] Exception when executing JDBC query {:exception=>#<Sequel::DatabaseError: Java::ComEdbUtil::PSQLException: This connection has been closed.>}
[2017-02-10T09:45:00,038][WARN][logstash.inputs.jdbc] Exception when executing JDBC query {:exception=>#<Sequel::DatabaseError: Java::ComEdbUtil::PSQLException: This connection has been closed.>}
[2017-02-10T09:45:00,038][WARN][logstash.inputs.jdbc] Exception when executing JDBC query {:exception=>#<Sequel::DatabaseError: Java::ComEdbUtil::PSQLException: This connection has been closed.>}

```

Why is this happening and it will be really helpful if somebody tell me how to fix this. It seems like a connection error, and is this a Logstash error?

Thanks in advance..

---

<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [March 10, 2017, 11:12am UTC](https://discuss.elastic.co/t/sql-connection-exception-continuing-in-logstash/74641/2 "2017-03-10T11:12:27Z")

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