How to find the size of replication-specific tables in SQL Server

On the distribution database, you can execute the statement below to get the sizes of the internal replication-specific tables.

USE distribution 
GO 
SELECT Getdate() AS CaptureTime, 
Object_name(t.object_id) AS TableName, 
st.row_count, 
s.NAME 
FROM sys.dm_db_partition_stats st WITH (nolock) 
INNER JOIN sys.tables t WITH (nolock) 
ON st.object_id = t.object_id 
INNER JOIN sys.schemas s WITH (nolock) 
ON t.schema_id = s.schema_id 
WHERE index_id < 2 
AND Object_name(t.object_id) 
IN ('MSsubscriptions', 
'MSdistribution_history', 
'MSrepl_commands', 
'MSrepl_transactions') 
ORDER BY st.row_count DESC