Agreement of Russian dynasty covers small and large-scale analysis of information (4,6)

I believe the answer is:

data mining

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'large-scale analysis of information' is the definition.
I can't judge whether this definition defines the answer.

'agreement of russian dynasty covers small' is the wordplay.
'agreement of russian' becomes 'da' (Russian for 'yes').
'dynasty' becomes 'tang' (I've seen this before).
'covers' means one lot of letters goes inside another.
'small' becomes 'mini' (I've seen this before).
'tang' going around 'mini' is 'tamining'.
'da'+'tamining'='DATA MINING'

'and' acts as a link.

Can you help me to learn more?

I've seen this clue in The Telegraph.

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