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Adding populus gotcha covering storage costs

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Chris Ward 2019-03-18 14:20:47 +01:00
parent f174cb9ab9
commit 61be78b42a
1 changed files with 3 additions and 1 deletions
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docs/introduction-to-smart-contracts.rst
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@ -388,7 +388,9 @@ Each account has a data area called **storage**, which is persistent between fun
and transactions.
Storage is a key-value store that maps 256-bit words to 256-bit words.
It is not possible to enumerate storage from within a contract and it is
comparatively costly to read, and even more to modify storage.
comparatively costly to read, and even more to modify storage. Because of this cost,
you should minimise what you store in persistent storage to what the contract needs to run.
Store data like derived calculations, caching, and aggregates outside of the contract.
A contract can neither read nor write to any storage apart from its own.
The second data area is called **memory**, of which a contract obtains