After data is written to a time series table, how fast you can query that data depends on the query method that you use.
If you call the GetTimeseriesData operation to query data, you can immediately access the newly written data.
If you use a mapping table that is created for the time series table to query data in SQL, you can immediately access the data that you just wrote to existing time series. However, when you use SQL to query the data or metadata of new time series, you may experience a slight delay, which is usually just a few seconds. For example, when you bring a new device online and it creates a time series, the server automatically builds a metadata index for the new time series after the time series is received. The indexing process takes a few seconds to complete.