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Write-Ahead Log (WAL)

Write-Ahead Log (WAL) is a set of append-only files recording all writes on ArangoDB server. It is typically used to perform data recovery after a crash or synchronize slave databases with master databases in replicated environments. WAL operations can only be performed by admin users via _system database.

Example:

from arango import ArangoClient

# Initialize the ArangoDB client.
client = ArangoClient()

# Connect to "_system" database as root user.
sys_db = client.db('_system', username='root', password='passwd')

# Get the WAL API wrapper.
wal = sys_db.wal

# Configure WAL properties.
wal.configure(
    historic_logs=15,
    oversized_ops=False,
    log_size=30000000,
    reserve_logs=5,
    throttle_limit=0,
    throttle_wait=16000
)

# Retrieve WAL properties.
wal.properties()

# List WAL transactions.
wal.transactions()

# Flush WAL with garbage collection.
wal.flush(garbage_collect=True)

# Get the available ranges of tick values.
wal.tick_ranges()

# Get the last available tick value.
wal.last_tick()

# Get recent WAL operations.
wal.tail()

See :class:`WriteAheadLog` for API specification.