# Since\_db
**URL:** https://discuss.elastic.co/t/since-db/87459
**Category:** Logstash
**Created:** [May 29, 2017, 1:33pm UTC](https://discuss.elastic.co/t/since-db/87459 "2017-05-29T13:33:55Z")
**Posts on this page:** 5
**Page:** 1
### Author:  [@Renu\_Sharma](https://discuss.elastic.co/u/Renu_Sharma)
#### Post date: [May 29, 2017, 1:33pm UTC](https://discuss.elastic.co/t/since-db/87459/1 "2017-05-29T13:33:55Z")
Hi,
I have doubt in since\_db which log-stash generate.
is it necessary to delete since\_db file each time or we have any other way?
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### Author:  [@Nico-DF](https://discuss.elastic.co/u/Nico-DF)
#### Post date: [May 29, 2017, 1:39pm UTC](https://discuss.elastic.co/t/since-db/87459/2 "2017-05-29T13:39:27Z")
If it's for replay purpose while developing, you don't have to.
You can use the sincedb\_path option in file and set it to `/dev/null` on linux, and `NUL` on windows
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### Author:  [@Renu\_Sharma](https://discuss.elastic.co/u/Renu_Sharma)
#### Post date: [May 30, 2017, 5:42am UTC](https://discuss.elastic.co/t/since-db/87459/3 "2017-05-30T05:42:00Z")
Hi,
Thanks for your quick reply.
I have tried this as sincedb\_path =\> "NUL"
But when i am using this its not generating any output.
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### Author:  [@Renu\_Sharma](https://discuss.elastic.co/u/Renu_Sharma)
#### Post date: [May 30, 2017, 5:45am UTC](https://discuss.elastic.co/t/since-db/87459/4 "2017-05-30T05:45:29Z")
Hi,
I was giving incorrect syntax..i correct that..its working now.
Thanks..🙂
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### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [June 27, 2017, 5:45am UTC](https://discuss.elastic.co/t/since-db/87459/5 "2017-06-27T05:45:31Z")
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