Database and retention policy mapping
The InfluxDB 1.x data model includes databases and retention policies. InfluxDB 2.7 replaces databases and retention policies with buckets. To support InfluxDB 1.x query and write patterns in InfluxDB 2.7, databases and retention policies are mapped to buckets using the database and retention policy (DBRP) mapping service.
The DBRP mapping service uses the database and retention policy specified in 1.x compatibility API requests to route operations to a bucket.
Default retention policies
A database can have multiple retention policies with one set as default.
If no retention policy is specified in a query or write request, InfluxDB uses
the default retention policy for the specified database.
Use the influx CLI or the InfluxDB API to set a retention policy as the
default retention policy for a database.
When creating a bucket
When you create a bucket, InfluxDB 2.7 automatically creates a “virtual” DBRP mapping. Virtual DBRP mappings are those that are created on your behalf.
- If your bucket name includes a forward slash (
/), the virtual DBRP mapping uses everything before the forward slash as the database name and everything after the forward slash as the retention policy name. If the database does not already have a default retention policy, the parsed retention policy is set as the default. - If your bucket name does not include a forward slash (
/), the virtual DBRP mapping uses the bucket name as the database andautogenas the retention policy. Theautogenretention policy is set as the default retention policy.
When writing data
When writing data using the
/write compatibility endpoint,
the DBRP mapping service uses the database and retention policy specified
in the request to write the data to the appropriate bucket.
When querying data
When querying data from InfluxDB 2.7
using the /query compatibility endpoint,
the DBRP mapping service uses the database and retention policy specified in the
request to query data from the appropriate bucket.
If no retention policy is specified, the database’s default retention policy is used.
A DBRP combination can only be mapped to a single bucket
Each unique DBRP combination can only be mapped to a single bucket. If you map a DBRP combination that is already mapped to another bucket, it will overwrite the existing DBRP mapping.
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