# JDBC issue when using paging

**URL:** <https://discuss.elastic.co/t/jdbc-issue-when-using-paging/111818>\
**Category:** Logstash\
**Created:** [December 14, 2017, 4:57pm UTC](https://discuss.elastic.co/t/jdbc-issue-when-using-paging/111818 "2017-12-14T16:57:45Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![arisbanach](https://avatars.discourse-cdn.com/v4/letter/a/f07891/32.png) [@arisbanach](https://discuss.elastic.co/u/arisbanach)\
**Post date:** [December 14, 2017, 4:57pm UTC](https://discuss.elastic.co/t/jdbc-issue-when-using-paging/111818/1 "2017-12-14T16:57:46Z")

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I am not sure why this is happening, but I have a large Postgres database I'm importing from Amazon RDS. I have set the `statement => "SELECT * from mytable"` and `jdbc_paging_enabled => true` and `jdbc_page_size => 10000`.

The weird issue is that when I run Logstash with this config, it takes a LONG time to do anything. I can see it connects to the database, then it hangs for about 20 minutes, and then it begins to import. If I tail `/var/log/logstash/logstash-plain.log` while it hangs it shows this:

```
[2017-12-14T16:48:10,396][INFO][logstash.pipeline] Pipeline started {"pipeline.id"=>"main"}
[2017-12-14T16:48:10,421][INFO][logstash.agent] Pipelines running {:count=>1, :pipelines=>["main"]}
[2017-12-14T16:48:15,897][INFO][logstash.inputs.jdbc] (0.013302s) SELECT version()

```

The odd thing is, if I comment out `jdbc_paging_enabled => true` and `jdbc_page_size => 10000` and set `statement => "SELECT * from mytable LIMIT 500"` it runs instantly without any issues. Almost any limit I set in the statement itself will make it run instantly.

Can someone weigh in what is causing this? I thought `jdbc_paging_enabled` was equivalent to setting `LIMIT 100000`. If that's true, why would the two produce two very different results?

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<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:** [January 11, 2018, 4:58pm UTC](https://discuss.elastic.co/t/jdbc-issue-when-using-paging/111818/2 "2018-01-11T16:58:00Z")

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