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Merge #20152: doc: Update wallet files in files.md

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defe48a51f doc: Update wallet files in files.md (Hennadii Stepanov)

Pull request description:

  This PR is a #19077 follow up, and it addresses the [comment](https://github.com/bitcoin/bitcoin/pull/19077#discussion_r504805234):

  > If need to update, there are two corrections that could be made:
  >
  >  * Line 69 "Wallets are Berkeley DB (BDB) databases" is no longer true
  >
  >  * Line 76 "Wallet lock file" should say "BDB wallet lock file"

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  RiccardoMasutti:
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  meshcollider:
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fanquake 2020-10-27 15:19:05 +08:00
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@ -8,6 +8,10 @@
- [Multi-wallet environment](#multi-wallet-environment)
- [Berkeley DB database based wallets](#berkeley-db-database-based-wallets)
- [SQLite database based wallets](#sqlite-database-based-wallets)
- [GUI settings](#gui-settings)
- [Legacy subdirectories and files](#legacy-subdirectories-and-files)
@ -67,26 +71,36 @@ Subdirectory | File(s) | Description
## Multi-wallet environment
Wallets are Berkeley DB (BDB) databases:
Wallets are Berkeley DB (BDB) or SQLite databases.
Subdirectory | File(s) | Description
-------------|-------------------|------------
`database/` | BDB logging files | Part of BDB environment; created at start and deleted on shutdown; a user *must keep it as safe* as personal wallet `wallet.dat`
`./` | `db.log` | BDB error file
`./` | `wallet.dat` | Personal wallet with keys and transactions. May be either a Berkeley DB or SQLite database file.
`./` | `.walletlock` | Wallet lock file
`./` | `wallet.dat-journal` | SQLite Rollback Journal file for `wallet.dat`. Usually created at start and deleted on shutdown. A user *must keep it as safe* as the `wallet.dat` file.
1. Each user-defined wallet named "wallet_name" resides in `wallets/wallet_name/` subdirectory.
1. Each user-defined wallet named "wallet_name" resides in the `wallets/wallet_name/` subdirectory.
2. The default (unnamed) wallet resides in `wallets/` subdirectory; if the latter does not exist, the wallet resides in the data directory.
3. A wallet database path can be specified by `-wallet` option.
3. A wallet database path can be specified with the `-wallet` option.
4. `wallet.dat` files must not be shared across different node instances, as that can result in key-reuse and double-spends due the lack of synchronization between instances.
5. Any copy or backup of the wallet should be done through a `backupwallet` call in order to update and lock the wallet, preventing any file corruption caused by updates during the copy.
### Berkeley DB database based wallets
Subdirectory | File(s) | Description
-------------|-------------------|-------------
`database/` | BDB logging files | Part of BDB environment; created at start and deleted on shutdown; a user *must keep it as safe* as personal wallet `wallet.dat`
`./` | `db.log` | BDB error file
`./` | `wallet.dat` | Personal wallet (a BDB database) with keys and transactions
`./` | `.walletlock` | BDB wallet lock file
### SQLite database based wallets
Subdirectory | File | Description
-------------|----------------------|-------------
`./` | `wallet.dat` | Personal wallet (a SQLite database) with keys and transactions
`./` | `wallet.dat-journal` | SQLite Rollback Journal file for `wallet.dat`. Usually created at start and deleted on shutdown. A user *must keep it as safe* as the `wallet.dat` file.
## GUI settings
`bitcoin-qt` uses [`QSettings`](https://doc.qt.io/qt-5/qsettings.html) class; this implies platform-specific [locations where application settings are stored](https://doc.qt.io/qt-5/qsettings.html#locations-where-application-settings-are-stored).