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Questions tagged [blockchain-import]

Questions about the blockchain-import feature including security related concerns and comparisons with syncing the blockchain from scratch

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F exception while reading from file, height=2521799: Error in deserialization of chunk

I have been following the What is the fastest way to synchronize the daemon? post to import the blockchain. I download the blockchain.raw successfully but I got error at importing the last block: $ ...
Péter Szilvási's user avatar
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How does the function get_and_convert_block_blob_from_height work?

"get_and_convert_block_blob_from_height" function is called multiple times when running the binaries such as depth, export, import. What does it do and how does it work ?
Mogambo's user avatar
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166 views

Blockchain is (fully?) synchronized, but lmdb size is 1 Gb

I'm just starting with Monero. I'm using pre-installed Monero (XMR) Wallet on Whonix. My settings are: Advanced mode Portable mode enabled Local node, with location of blockchain set to a separate ...
Zaza's user avatar
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1 answer
69 views

What is a fakechain?

The output of monerod --help and monero-blockchain-import --help show a --keep-fakechain option: --keep-fakechain Don't delete any existing database when ...
Flux's user avatar
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1 vote
1 answer
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Monerod synchronization very slow on SSD with good network bandwidth

I'm trying to sync local node. I downloaded the monero blockchain.raw file and imported it using monero-blockchain-import. Importing the blockchain took about 5 hours. But for some reasons it imported ...
mooko's user avatar
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2 votes
1 answer
1k views

More detailed explanations for the db-sync-mode parameters? (i.e. safe, fast, fastest; sync, async; and nblocks_per_sync)

Can someone give more detailed explanations on what the various db-sync-mode parameters actually do in monerod and monero-blockchain-import, and why one might select each of them? (i.e. safe, fast, ...
mmortal03's user avatar
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1 vote
1 answer
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Which is the more reliable coin after April 2018 network upgrade?

As far I understand monero is now divided as monero and monero classic/original/0 . So which is the more reliable coin? I do have a linux node in which an old version of monerod was installed. To ...
SMJ's user avatar
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17 votes
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I forgot to upgrade (from CLI or GUI v0.13 to CLI or GUI v0.14) and, as a result, accidentally synced to the wrong (alternative) chain

I forgot to upgrade (from CLI or GUI v0.13 to CLI or GUI v0.14) and, as a result, accidentally synced to the wrong (alternative) chain. How do I resolve this issue?
dEBRUYNE's user avatar
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8 votes
1 answer
3k views

Why does the option "--verify 0" for monero-blockchain-import not work?

When I use the command ./monero-blockchain-import --verify 0 --input-file ./blockchain.raw it says "Failed to parse arguments: unrecognised option '--verify'".
Lucy Tao's user avatar
4 votes
1 answer
7k views

Which directory does monero-blockchain-import, by default, use to store the imported blockchain?

I am not sure if this makes sense or not. I was using an old version of the Monero GUI and I was stuck at block 140001. I thought it was a sycning problem so I downloaded the raw blockchain from ...
Orange Man's user avatar
2 votes
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202 views

Move blockchain folder on Windows [duplicate]

I have read https://www.monero.how/tutorial-how-to-speed-up-initial-blockchain-sync and downloaded the 27.2 gb raw file. I had the monero gui installed and specified the directory for the blockchain ...
JP Hellemons's user avatar
2 votes
2 answers
1k views

Can't find the .bitmonero directory to set up the blockchain.raw file in Ubuntu 17.10?

I changed from windows to Ubuntu 17.10 Linux. I'm totally new on it. I've been learning how to work with the terminal, and I have already downloaded my old windows blockchain.raw file located in the ...
Luis Herrera's user avatar
1 vote
0 answers
157 views

bootstrap import data dir command not working

Hi I am trying to import the raw blockchain into my linux computers Persistent folder, however the command to tell it to do that will not work if I type ./monero-blockchain-import --data-dir /home/...
Chase's user avatar
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4 votes
1 answer
1k views

How do I constrain memory usage during initial blockchain sync

I'm trying to get monerod up and running on a VPS with 1gb of RAM. My understanding is that once the chain is synced, monerod's memory usage should be quite reasonable. However, during the initial ...
puzzler's user avatar
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1 vote
1 answer
346 views

Can I use a copy of a blockchain created on Mac OS X, on an offline Ubuntu (ARMv7) box?

I created a wallet on an offline/air-gapped Ubuntu box, but my main computer is a Mac. If I want to sync the offline Ubuntu wallet to check the balance, can I use the blockchain created on my Mac? If ...
tficharmers's user avatar
6 votes
1 answer
621 views

Since monerod through Tor is slower (on Whonix), would importing the .raw be faster?

My understanding is that importing a blockchain backup with Monero and other cryptocurrencies takes about the same time it takes to sync normally. The only reason I could see for someone doing that, ...
will's user avatar
  • 111
6 votes
2 answers
913 views

How do you convert the Monero blockchain from Linux to Windows?

I know there is a tool that can be used to convert the format but what steps should be taken to do so?
ferretinjapan's user avatar
7 votes
1 answer
264 views

Do checkpoints make initial blockchain sync faster?

Do the checkpoint hashes in checkpoints.cpp make the syncing go faster? Why or why not?
CQM's user avatar
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5 votes
1 answer
760 views

What is the risk of specifying --verify 0 with blockchain_import?

I have noticed that importing a blockchain snapshot file blockchain.raw speeds up dramatically when using --verify 0. The default value is 1 though. What is the downside, or risk, of not verifying ...
dpzz's user avatar
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8 votes
1 answer
942 views

Why is it faster to synchronize from the network than to import from a raw data file?

I've read some places that its faster to synchronize from the network than to download and then import a raw blockchain file. Why is it faster to synchronize from the network?
Ginger Ale's user avatar
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