Below is a 5-minute tutorial to test Streaming Query Replication from Postgres to Snowflake

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Step 1: CREATE Postgres and Snowflake Peers

  1. CREATE Postgres PEER
  2. CREATE Snowflake PEER

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Step 2: Create and populate tables on the Postgres PEER

Below script helps creates and populate pgbench_history with dummy data on your PostgreSQL peer. 
curl -O https://peerdb-sample-data.s3.us-east-2.amazonaws.com/import_data_for_tutorial.sh
chmod +x import_data_for_tutorial.sh
# "postgres://user:password@hostname:5432/dbname"
# is the connection string of your PostgreSQL peer.
./import_data_for_tutorial.sh "postgres://user:password@hostname:5432/dbname"

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Step 3: Create pgbench_history table on the destination (snowflake) PEER

CREATE TABLE pgbench_history (tid integer, bid integer,
aid integer, delta integer, mtime timestampntz, filler text);

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Step 4: Kick off MIRROR with 8 threads and 50000 rows per partition

CREATE MIRROR postgres_to_snowflake_tutorial
FROM postgres_peer TO snowflake_peer FOR
$$SELECT * FROM public.pgbench_history WHERE mtime BETWEEN {{.start}} AND {{.end}}$$
WITH (
	watermark_column = 'mtime',
	watermark_table_name = 'pgbench_history',
	mode = 'append',
	parallelism = 8,
	refresh_interval = 10,
	num_rows_per_partition = 50000,
	destination_table_name = 'public.pgbench_history'
);

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Step 5: Monitor the MIRROR

You can connect to localhost:8085 to gain full visibility into the different jobs and steps that PeerDB performs under the hood to manage the MIRROR.

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Step 6: Validate the MIRROR

In 1-2 minutes the MIRROR should complete syncing data. Now validate the data on both postgres and snowflake peers. Number of rows should match 
SELECT count(*) FROM postgres_peer.pgbench_history;
SELECT count(*) FROM snowflake_peer.public.pgbench_history;