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Why per-wallet db.log and database?
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Topic: Why per-wallet db.log and database? (Read 176 times)
jnano
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Why per-wallet db.log and database?
March 06, 2018, 05:03:24 PM
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ABCbits
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#1
In a
GitHub discussion
related to multi-wallet there was a mention of (optionally?) each wallet having "its own bdb environment", and storing each wallet.dat in a directory along with db.log and a /database subdirectory.
What's the idea here and what's the database directory supposed to hold?
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achow101
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Re: Why per-wallet db.log and database?
March 09, 2018, 12:48:20 AM
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ABCbits
(2)
#2
Both the file db.log and the directory
database
are files used by the BDB database engine. The directory
database
is a temporary directory that is used to store data about the wallet while the wallet database is open. If Bitcoin Core is uncleanly closed, the BDB database will also be uncleanly closed. If it is uncleanly closed, then in order to open it again without having any problems, you must have the
database
directory as it contains some BDB state data. If they are separated (wallet.dat moved out or
database
is deleted), then the wallet database can be corrupted and private keys corrupted. This can result in a loss of funds.
Having separate wallet directories containing their own database environments allows for better dynamic wallet handling and a failure to close the BDB environment cleanly may only just effect one wallet instead of all wallets.
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jnano
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Re: Why per-wallet db.log and database?
March 16, 2018, 01:41:14 PM
#3
So wallet.dat is BDB, and ./database/ is a transactional log?
achow101
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Re: Why per-wallet db.log and database?
March 16, 2018, 05:45:34 PM
#4
Quote from: jnano on March 16, 2018, 01:41:14 PM
So wallet.dat is BDB, and ./database/ is a transactional log?
database/ is used for whatever other temporary data BDB needs. This includes (but is not necessarily limited to) database transaction logs.
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