skywalking-java/docs/en/setup/backend/backend-storage.md

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# Backend storage
SkyWalking storage is pluggable, we have provided the following storage solutions, you could easily
use is by changing the `application.yml`
- [**H2**](#h2)
- [**ElasticSearch 6**](#elasticsearch-6)
## H2
Active ElasticSearch 6 as storage, set storage provider to **H2**.
Setting fragment example
```yaml
```
## ElasticSearch 6
Active ElasticSearch 6 as storage, set storage provider to **elasticsearch**.
Setting fragment example
```yaml
storage:
elasticsearch:
clusterNodes: localhost:9200
indexShardsNumber: 2
indexReplicasNumber: 0
# Batch process setting, refer to https://www.elastic.co/guide/en/elasticsearch/client/java-api/5.5/java-docs-bulk-processor.html
bulkActions: 2000 # Execute the bulk every 2000 requests
bulkSize: 20 # flush the bulk every 20mb
flushInterval: 10 # flush the bulk every 10 seconds whatever the number of requests
concurrentRequests: 2 # the number of concurrent requests
# Set a timeout on metric data. After the timeout has expired, the metric data will automatically be deleted.
traceDataTTL: 90 # Unit is minute
minuteMetricDataTTL: 90 # Unit is minute
hourMetricDataTTL: 36 # Unit is hour
dayMetricDataTTL: 45 # Unit is day
monthMetricDataTTL: 18 # Unit is month
```
## More storage solution extension
Follow [Storage extension development guide](../../guides/storage-extention.md)
in [Project Extensions document](../../guides/README.md#project-extensions) in development guide.