# Transportable databases parameter reference
Transportable databases parameter reference

Several parameters control the behavior of the `pg_transport` extension. Following, you can find descriptions of these parameters. 

**`pg_transport.num_workers`**  
The number of workers to use for the transport process. The default is 3. Valid values are 1–32. Even the largest database transports typically require fewer than 8 workers. The value of this setting on the destination DB instance is used by both destination and source during transport.

**`pg_transport.timing` **  
Specifies whether to report timing information during the transport. The default is `true`, meaning that timing information is reported. We recommend that you leave this parameter set to `true` so you can monitor progress. For example output, see [Transporting a PostgreSQL database to the destination from the source](PostgreSQL.TransportableDB.Transporting.md).

**`pg_transport.work_mem`**  
The maximum amount of memory to allocate for each worker. The default is 131072 kilobytes (KB) or 262144 KB (256 MB), depending on the PostgreSQL version. The minimum value is 64 megabytes (65536 KB). Valid values are in kilobytes (KBs) as binary base-2 units, where 1 KB = 1024 bytes.   
The transport might use less memory than is specified in this parameter. Even large database transports typically require less than 256 MB (262144 KB) of memory per worker.