sqlite-lsm1
Fast Python bindings for SQLite's LSM1 key/value store. LSM1 originated in the experimental SQLite4 project and now lives in the SQLite source tree. This package builds the engine and its Cython wrapper into a single native Python extension.
Features:
- Embedded, zero-configuration key/value database.
- Ordered traversal and nearest-key lookups using cursors.
- Nested transactions.
- Single-writer/multiple-reader MVCC concurrency.
- Checksummed transaction log and crash recovery.
- Linux, macOS, and Windows wheel builds.
- Python 3.9 and newer.
The durable database is stored in one main file. While a database is open,
LSM1 also uses -log and -shm sidecar files for recovery and shared state.
The sidecars are normally removed when the final connection closes cleanly.
Installation
Install a published wheel with pip:
python -m pip install sqlite-lsm1
Building from source requires a C compiler. Cython is installed automatically in pip's isolated build environment:
git clone https://github.com/carlopires/python-lsm-db
cd python-lsm-db
python -m pip install .
The distribution is named sqlite-lsm1; the import remains lsm for
compatibility with applications using the original package.
Quick start
Create a database by passing its path to LSM:
from lsm import LSM
db = LSM("test.ldb")
Keys and values
The database has a dictionary-like API:
db["foo"] = "bar"
assert db["foo"] == b"bar"
for i in range(4):
db[f"k{i}"] = str(i)
assert "k3" in db
assert "k4" not in db
del db["k3"]
Strings are encoded as UTF-8. Retrieved keys and values are always bytes.
Other input objects are converted to strings before being encoded; use
bytes directly when an exact binary representation matters.
Missing exact lookups raise KeyError. Nearest-key searches use SEEK_LE
and SEEK_GE:
from lsm import SEEK_GE, SEEK_LE
assert db["k1xx", SEEK_LE] == b"1"
assert db["k1xx", SEEK_GE] == b"2"
insert_many() atomically inserts either a mapping or an iterable of
(key, value) pairs in a single transaction:
rows = ((f"key-{i}", f"value-{i}") for i in range(10_000))
inserted = db.insert_many(rows)
assert inserted == 10_000
The input is streamed rather than materialized. If conversion or insertion
fails, the complete batch is rolled back. update() provides the same atomic
behavior for mappings:
db.update({"alpha": "a", "beta": "b"})
Slices and iteration
Iteration yields (key, value) byte pairs in bytewise key order:
list(db)
# [(b"alpha", b"a"), (b"beta", b"b"), (b"foo", b"bar"),
# (b"k0", b"0"), (b"k1", b"1"), (b"k2", b"2")]
Slices return generators and include both bounds:
list(db["k0":"k9"])
# [(b"k0", b"0"), (b"k1", b"1"), (b"k2", b"2")]
list(db["k0":])
list(db[:"k2"])
A descending pair of bounds selects reverse order. For an open-ended reverse
slice, use True as the step:
list(db["k2":"k0"])
# [(b"k2", b"2"), (b"k1", b"1"), (b"k0", b"0")]
list(db["k2"::True])
Slice deletion excludes the boundary keys:
del db["k0":"k9"]
Cursors
Cursors provide explicit control over traversal:
with db.cursor() as cursor:
for key, value in cursor:
print(key, value)
with db.cursor() as cursor:
cursor.seek("k0", SEEK_GE)
rows = list(cursor.fetch_until("k99"))
Always close cursors. A database cannot close while any of its cursors remain open, so using the cursor context manager is recommended.
Transactions
Transactions may be nested:
with db.transaction():
db["k1"] = "outer"
with db.transaction() as nested:
db["k2"] = "nested"
nested.rollback()
assert db["k1"] == b"outer"
assert "k2" not in db
transaction() can also decorate a function. A normal return commits and an
exception rolls back:
@db.transaction()
def store_pair(key1, value1, key2, value2):
db[key1] = value1
db[key2] = value2
Explicit begin(), commit(), and rollback() methods are available when a
context manager is not suitable.
Threads
Potentially blocking database, cursor, and maintenance operations release the GIL. Each connection serializes access with a re-entrant lock. A transaction owns its connection until its outermost commit or rollback, so another thread cannot interleave work with it.
Use one LSM connection per worker thread when actual overlap is desired.
LSM1 permits concurrent readers but still has a single-writer model.
Maintenance and tuning
The most commonly used tuning properties are:
autoflush: live in-memory tree limit in KB; default 1024.autocheckpoint: automatic checkpoint interval in KB; default 2048.automerge: target number of segments merged at once; default 4.autowork: automatically flush and merge during writes; enabled by default.write_safety:SAFETY_OFF,SAFETY_NORMAL, orSAFETY_FULL.transaction_log: enable the recovery log; enabled by default.multiple_processes: enable file locking and shared state; enabled by default.mmap: configure memory-mapped reads.
Applications that disable automatic work should schedule flush(), work(),
and checkpoint() themselves. checkpoint() returns the number of KB made
durable in the database file.
Development
Run the tests from an installed source checkout:
python tests.py
Build the documentation with:
python -m pip install -r docs/requirements.txt
sphinx-build -W -b html docs docs/_build/html
The complete API reference is maintained in the project documentation.
License
The Python wrapper is distributed under the MIT License. The vendored SQLite
LSM1 sources are in the public domain. See LICENSE and SQLITE_LICENSE.
1 maintainer
Release files for sqlite-lsm1 0.8.0
For a detailed explanation of source distributions (sdists) and built distributions (wheels), please see the package formats documentation.
Source distribution (sdist)
| File | Size | Uploaded | |
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| sqlite_lsm1-0.8.0.tar.gz | 414.2 kB | Details |
Built distributions (wheels)
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