2
votes
Accepted
Can I use MongoDB for storing data locally instead of storing in RAM?
The Mongo_DB_plugin can be configured to listen to actions on chain from a locally hosted node. This can be resource intensive in processing large blocks, you don't have the option to listen through ...
- 3,425
2
votes
is that a good way to gather smart contract action data in backend with Demux.js？
Demux is intended for use when there is s lot of data that you want to save to the blockchain but not necessarily to RAM. RAM is an expensive resource and only needed if the dApp needs access to the ...
- 1,686
2
votes
Accepted
Onboarding new eos users to a note taking dapp
This issue has always been a tricky one, I believe steemit stores all the data on the block(which is insane if you consider the EOS ram prices). It is especially annoying for the second point that you ...
- 208
2
votes
Can we use mongodb store state?
Well, it depends.
But you've already got the right path to reduce RAM usage.
The first thing is whether the user state you mention is intend to be stored on the blockchain or not, fully or partly?
...
- 174
1
vote
How user data stored on the eos blockchain is compliant with regulations?
First of all, user data does not necessarily equal personal data and as long as you do not store personal data or something that falls under the GDPR on a public Blockchain you are ok.
It's simple, ...
- 1,929
1
vote
Accepted
nested stuff inside index_table
Without knowing the exact game logic I can't really answer your question but the following should at least show you how to nest objects.
struct [[eosio::table]] user_t {
struct card_skin_t {
...
- 1,929
1
vote
What is the way to create a map from 256 bit integers to values?
My answer is too long to fit in comment, so leave here.
I came to know we are using different terms, but saying same things. eosio::multi_index is a table and you can add items (I called these 'rows')...
- 2,320
1
vote
Accepted
Failed to migrate to postgres database: nerror: duplicate key value violates unique constraint \"pg_namespace_nspname_index\"
Other than the error of the duplicate key I would get a deadlock detected error, if I ever ran the demux after previously running it, or I would get current transaction is aborted, commands ignored ...
- 141
1
vote
Where and who is storing all the memo field data when its included in a transaction?
That's not a clear question, because a memo-field can be implemented in several different ways and if a developer wants to, he can also store it in RAM.
Assuming that you mean the memo of a standard ...
- 1,929
1
vote
What is mongodb_plugin used for?
chain_plugin is actually the core part that manages the blockchain data structure in nodeos. Most of time it is enabled automatically.
mongo_db_plugin is an add-on plugin that aims to replace the ...
- 475
1
vote
Accepted
mongodb sync is not fast enough
nodeos syncing is very CPU intensive but mongo_db_plugin is even much more CPU and IO intensive.
I see you are using a cloud server for nodeos, which is very likely not performant enough. In my ...
- 475
1
vote
Onboarding new eos users to a note taking dapp
You may want to check out NoteChain, which is Block.one's note taking application that they use as an example project for dApp developers to use as boilerplate:
NoteChain demonstrates the eosio ...
- 5,554
1
vote
Accepted
Using Demux to store data offchain in EOS blockchain
I've integrated it in my simple Chess Dapp if you'd like a code example:
https://github.com/NatPDeveloper/eos-chess/tree/master/js/lib/demux-js
Specifying contract:action to listen for:
const ...
- 3,425
1
vote
Accepted
Can you upload binary files to RAM?
You definitely should not use RAM for binary data unless it's literally very few bytes.
The RAM cost will be prohibitive.
And just imagine it in scale: the current available amount of RAM can store ...
- 598
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