Questions tagged [database]
Questions pertaining to runtime storage and chain databases, including querying storage, database back-ups and archiving.
24
questions
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How to generate database weights?
As a chain grows the DB operations should get costlier. Is there a standard procedure that outlines how to generate these weights? Or should we continue using the default substrate weights for this ...
- 3,702
3
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2
answers
39
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Is it possible to bootstrap a parachain node from pre-existing solo chainstate?
Let's imagine a scenario where a team is running a substrate private network and have all their chainstate that they want to move to a parachain after acquiring a slot. My question is, when the team ...
- 3,702
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29
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ink dapp asking to sign transactions everytime i reload
so i am building a dapp with ink
it has messages to get data and put data
and on FE when i logged in with the polkadot-js extension wallet
everytime i reload the page it asks me to sign the ...
- 133
2
votes
0
answers
16
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Offchain Storage lock vs compare-set/mutate function
While using offchain workers when do we want to use a StorageLock and when would we want to use a mutate function on StorageValueRef since both of them are kind of lock on db.
3
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1
answer
47
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How to store offchain mutable values
Are there offchain storage options in substrate? Like a regular mongodb- or mysql database, I don't want to use something else and just stick with something supported with substrate stack.
The only ...
- 1,073
4
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1
answer
176
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State Pruning: Archive-Canonical vs Archive-Finalized
Currently in substrate there is a possibility to set state pruning to "archive-canonical" or "number". In docs it states, that these values will cause to:
archive-canonical - Keep ...
- 41
0
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1
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62
views
Caching functions
My rust is limited, I would like to simplify some of my code, and it would be helpful if I could have a caching function to cache database reads in memory.
Are there any helpers that I can use for ...
- 766
0
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65
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What is the best available way to take substrate DB backup without stopping the service? [duplicate]
I have the substrate setup on AWS EC2 with EBS volume attached to it. I wonder what would be the best way to take substrate DB backup.
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119
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What is the best practice for storing a hash?
I am about to make the decision on how to store some hash value inside the blockchain. A hash value is the best practice to minimise the size of the blockchain, but still allows people to verify ...
- 503
3
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1
answer
156
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Export state of a running chain and run it as alice
Hello everyone,
I'm trying to spin up a test chain(with imported real chain data) with alice(so I can start it from genesis and start producing blocks with --alice flag) and after dumping the state of ...
- 319
3
votes
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answer
199
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How to prune sibling blocks?
Testing some behaviors on a collator, I often end-up with [🌗] Block import error: State Database error: Too many sibling blocks inserted
Is there way to remove those siblings from the database ?
- 781
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275
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How can I purging chain database between tests of a development testnet?
I am running a few tests using Jest and Polkadot.js, and I need to reset the state before each test. Should I do that or spawn a new node each time? And if so, what's the best way to do it? I am using ...
4
votes
1
answer
127
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How to to run the substrate-node-template with parity-db instead of rockdb?
I'm looking for a how-to-guide, or an example that runs the substrate-node-template using parity-db instead of rockdb.
- 682
8
votes
1
answer
102
views
Get block height from database snapshot, without running a node
I have synced a Substrate-based parachain (Moonbase Alpha) and stopped the node to take a snapshot of the database directory. I would like to know what's the best block (block height, last finalized ...
- 181
4
votes
2
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70
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Is there a way for a validator node to store relay chain db and parachain data in different partitions
Is there a way to tell the validator node to store db/full/parachains on a different partition/location. Or is it safe to rsync it to a folder on another partition and then simlink it for a live ...
- 278
9
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204
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Is there a way to prune blocks/transactions from the database
My understanding is that --pruning remove the old trie nodes but does not delete the content of the blocks, is there a way to also delete the blocks/transaction up to some point and only keep states ...
- 278
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318
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Why does Substrate use rocksdb & paritydb over leveldb?
What are the benefits of rocksdb over leveldb? Can Substrate use leveldb?
I understand that rocksdb was the database of choice for Parity Ethereum client, and paritydb aims to fix a lot of the ...
- 123
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How do I create a snapshot of the substrate database and load it on future runs? [duplicate]
I am making use of JS tests to check my contract calls however there is a large amount of setup required before each test. This means the tests take a very long time to run. I know the substrate ...
- 1,462
2
votes
1
answer
65
views
Off-chain DB indexing example
Where can I find Tomasz Drwięga Off-chain DB indexing example, implementing the following runtime function?
fn on_finalize(_n: BlockNumberFor<T>){}
TIA
- 682
4
votes
1
answer
72
views
DB backup and restarting the node with the DB backed up file is not working as expected
We are trying to restart the nodes with the DB backup file such as chain data DB, keystore etc these are backed up regularly. But we are getting the below error :
Error: Service(Client(Backend("...
- 759
11
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1
answer
275
views
How expensive is it to access storage items?
How expensive are storage reads and writes?
Does the cost depend on the size of the item?
- 8,463
3
votes
2
answers
109
views
Persistent Offchain Worker Storage
Offchain workers storage comes in two flavors: Persistent and Local.
pub enum StorageKind {
/// Persistent storage is non-revertible and not fork-aware. It means that any value
/// set by the ...
- 2,414
10
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4
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348
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How to configure a Substrate Network with Injected Block History from a snapshot or database backup?
Is it possible to use the chain specification file or some other mechanism to configure a Substrate network with injected block history? In this case, the motivation is CI/CD/testing, but I can see ...
- 650
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Does each block save a copy of a Storage item?
This is what I read from the substrate storage docs: https://docs.substrate.io/v3/runtime/storage/
Runtime storage allows you to store data in your blockchain that is
persisted between blocks and can ...
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