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History

moneromooo-monero 383ff4f689 remove "using namespace std" from headers It's nasty, and actually breaks on Solaris, where if.h fails to build due to: struct map *if_memmap;		2017-11-14 16:56:10 +00:00
..
blockchain_export.cpp	Fix compiler warnings with Clang 6.0.0.	2017-10-15 22:02:24 +03:00
blockchain_import.cpp	remove "using namespace std" from headers	2017-11-14 16:56:10 +00:00
blockchain_utilities.h	blockchain_import: warn for chunks over 500000, not 100000	2017-09-01 22:48:33 +01:00
blocksdat_file.cpp	precomputed block hashes are now in blocks of N (currently 256)	2017-09-18 16:29:00 +01:00
blocksdat_file.h	precomputed block hashes are now in blocks of N (currently 256)	2017-09-18 16:29:00 +01:00
bootstrap_file.cpp	remove "using namespace std" from headers	2017-11-14 16:56:10 +00:00
bootstrap_file.h	remove "using namespace std" from headers	2017-11-14 16:56:10 +00:00
bootstrap_serialization.h	update copyright year, fix occasional lack of newline at line end	2017-02-21 19:38:18 +02:00
CMakeLists.txt	blockchain_utilities: Add monero-blockchain-{ex,im}port binaries to	2017-10-15 22:19:38 +01:00
README.md	update copyright year, fix occasional lack of newline at line end	2017-02-21 19:38:18 +02:00

README.md

Monero Blockchain Utilities

Introduction

The blockchain utilities allow one to import and export the blockchain.

Usage:

See also each utility's "--help" option.

Export an existing blockchain database

$ monero-blockchain-export

This loads the existing blockchain and exports it to $MONERO_DATA_DIR/export/blockchain.raw

Import the exported file

$ monero-blockchain-import

This imports blocks from $MONERO_DATA_DIR/export/blockchain.raw (exported using the monero-blockchain-export tool as described above) into the current database.

Defaults: --batch on, --batch size 20000, --verify on

Batch size refers to number of blocks and can be adjusted for performance based on available RAM.

Verification should only be turned off if importing from a trusted blockchain.

If you encounter an error like "resizing not supported in batch mode", you can just re-run the monero-blockchain-import command again, and it will restart from where it left off.

## use default settings to import blockchain.raw into database
$ monero-blockchain-import

## fast import with large batch size, database mode "fastest", verification off
$ monero-blockchain-import --batch-size 20000 --database lmdb#fastest --verify off

Import options

--input-file specifies input file path for importing

default: <data-dir>/export/blockchain.raw

--output-file specifies output file path to export to

default: <data-dir>/export/blockchain.raw

--block-stop stop at block number

--database <database type>

--database <database type>#<flag(s)>

database type: lmdb, memory

flags:

The flag after the # is interpreted as a composite mode/flag if there's only one (no comma separated arguments).

The composite mode represents multiple DB flags and support different database types:

safe, fast, fastest

Database-specific flags can be set instead.

LMDB flags (more than one may be specified):

nosync, nometasync, writemap, mapasync, nordahead

Examples:

$ monero-blockchain-import --database lmdb#fastest

$ monero-blockchain-import --database lmdb#nosync

$ monero-blockchain-import --database lmdb#nosync,nometasync