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SQLite support in LND

With the introduction of the kvdb interface, LND can support multiple database backends. One of the supported backends is sqlite. This document describes how use LND with a sqlite backend.

Note that for the time being, the sqlite backend option can only be set for new nodes. Setting the option for an existing node will not migrate the data.

Supported platforms and architectures

Note that the sqlite backend is not supported for Windows (386/ARM) or for Linux (PPC/MIPS) due to these platforms not being supported by the sqlite driver library.

Configuring LND for SQLite

LND is configured for SQLite through the following configuration options:

  • db.backend=sqlite to select the SQLite backend.
  • db.sqlite.timeout=... to set the connection timeout. If not set, no timeout applies.
  • db.sqlite.busytimeout=... to set the maximum amount of time that a db call should wait if the db is currently locked.
  • db.sqlite.pragmaoptions=... to set a list of pragma options to be applied to the db connection. See the sqlite documentation for more information on the available pragma options.

Default pragma options

Currently, the following pragma options are always set:

foreign_keys=on
journal_mode=wal
busy_timeout=5000 // Overried with the db.sqlite.busytimeout option.

The following pragma options are set by default but can be overridden using the db.sqlite.pragmaoptions option:

synchronous=full
auto_vacuum=incremental
fullfsync=true // Only meaningful on a Mac.

Auto-compaction

To activate auto-compaction on startup, the incremental_vacuum pragma option should be used:

// Use N to restrict the maximum number of pages to be removed from the 
// freelist.
db.sqlite.pragmaoptions=incremental_vacuum(N) 

// Omit N if the entire freelist should be cleared.
db.sqlite.pragmaoptions=incremental_vacuum

Example as follows:

[db]
db.backend=sqlite
db.sqlite.timeout=0
db.sqlite.busytimeout=10s
db.sqlite.pragmaoptions=temp_store=memory
db.sqlite.pragmaoptions=incremental_vacuum