Retain: specifies some time for which info is retained. Enter a value in between one and 365000. The default value is 3650. The value from the Maintain parameter need to be greater than or equal to the worth from the DURATION parameter. TDengine instantly deletes facts that is more mature https://tdenginedatabase01975.blogminds.com/5-essential-elements-for-tdengine-database-17547623