Include sqlite3 in documentation

Author: achow101

doc/build-osx.md

@@ -19,7 +19,7 @@ Then install [Homebrew](https://brew.sh).
 
 ## Dependencies
 ```shell
-brew install automake berkeley-db4 libtool boost miniupnpc pkg-config python qt libevent qrencode
+brew install automake berkeley-db4 libtool boost miniupnpc pkg-config python qt libevent qrencode sqlite
 ```
 
 If you run into issues, check [Homebrew's troubleshooting page](https://docs.brew.sh/Troubleshooting).
@@ -79,7 +79,7 @@ compiled in `disable-wallet` mode with:
 ./configure --disable-wallet
 ```
 
-In this case there is no dependency on Berkeley DB 4.8.
+In this case there is no dependency on Berkeley DB 4.8 and SQLite.
 
 Mining is also possible in disable-wallet mode using the `getblocktemplate` RPC call.
 

doc/build-unix.md

@@ -46,6 +46,7 @@ Optional dependencies:
  libqrencode | QR codes in GUI  | Optional for generating QR codes (only needed when GUI enabled)
  univalue    | Utility          | JSON parsing and encoding (bundled version will be used unless --with-system-univalue passed to configure)
  libzmq3     | ZMQ notification | Optional, allows generating ZMQ notifications (requires ZMQ version >= 4.0.0)
+ sqlite3     | SQLite DB       | Wallet storage (only needed when wallet enabled)
 
 For the versions used, see [dependencies.md](dependencies.md)
 
@@ -91,6 +92,10 @@ pass `--with-incompatible-bdb` to configure.
 
 Otherwise, you can build from self-compiled `depends` (see above).
 
+SQLite is required for the wallet:
+
+    sudo apt install libsqlite3-dev
+
 To build Bitcoin Core without wallet, see [*Disable-wallet mode*](/doc/build-unix.md#disable-wallet-mode)
 
 
@@ -144,6 +149,10 @@ libqrencode (optional) can be installed with:
 
     sudo dnf install qrencode-devel
 
+SQLite can be installed with:
+
+    sudo dnf install sqlite-devel
+
 Notes
 -----
 The release is built with GCC and then "strip bitcoind" to strip the debug
@@ -238,7 +247,7 @@ disable-wallet mode with:
 
     ./configure --disable-wallet
 
-In this case there is no dependency on Berkeley DB 4.8.
+In this case there is no dependency on Berkeley DB 4.8 and SQLite.
 
 Mining is also possible in disable-wallet mode using the `getblocktemplate` RPC call.
 

doc/dependencies.md

@@ -21,6 +21,7 @@ These are the dependencies currently used by Bitcoin Core. You can find instruct
 | Python (tests) |  | [3.5](https://www.python.org/downloads) |  |  |  |
 | qrencode | [3.4.4](https://fukuchi.org/works/qrencode) |  | No |  |  |
 | Qt | [5.9.8](https://download.qt.io/official_releases/qt/) | [5.5.1](https://github.com/bitcoin/bitcoin/issues/13478) | No |  |  |
+| SQLite | [3.32.1](https://sqlite.org/download.html) | [3.7.17](https://github.com/bitcoin/bitcoin/pull/19077) |  |  |  |
 | XCB |  |  |  |  | [Yes](https://github.com/bitcoin/bitcoin/blob/master/depends/packages/qt.mk) (Linux only) |
 | xkbcommon |  |  |  |  | [Yes](https://github.com/bitcoin/bitcoin/blob/master/depends/packages/qt.mk) (Linux only) |
 | ZeroMQ | [4.3.1](https://github.com/zeromq/libzmq/releases) | 4.0.0 | No |  |  |
@@ -33,6 +34,7 @@ Some dependencies are not needed in all configurations. The following are some f
 #### Options passed to `./configure`
 * MiniUPnPc is not needed with  `--with-miniupnpc=no`.
 * Berkeley DB is not needed with `--disable-wallet`.
+* SQLite is not needed with `--disable-wallet`.
 * Qt is not needed with `--without-gui`.
 * If the qrencode dependency is absent, QR support won't be added. To force an error when that happens, pass `--with-qrencode`.
 * ZeroMQ is needed only with the `--with-zmq` option.

doc/files.md

@@ -72,8 +72,9 @@ 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 (BDB) with keys and transactions
+`./`         | `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.