Quick size comparison:
```
$ ./convert
[ 0.000001] pickle.load
[ 2.983616] write sqlite3
[ 8.993280] write DBM (GNU)
[ 61.849732] write DBM (NDBM)
[ 87.584065] done
$ ls -Slh contents_mapping-jammy-amd64.*
-rw-rw-r-- 1 bdrung bdrung 2,1G Jul 23 15:10
contents_mapping-jammy-amd64.ndbm.db
-rw-rw-r-- 1 bdrung bdrung 1,2G Jul 23 15:09 contents_mapping-jammy-amd64.dbm
-rw-r--r-- 1 bdrung bdrung 802M Jul 23 15:08 contents_mapping-jammy-amd64.db
-rw-rw-r-- 1 bdrung bdrung 753M Jul 23 14:49 contents_mapping-jammy-amd64.pickle
```
Script for it:
```python3
#!/bin/python3
import dbm.gnu
import dbm.ndbm
import pickle
import sqlite3
import sys
import time
START_TIME = time.perf_counter()
def log(text: str) -> None:
time_ = time.perf_counter() - START_TIME
sys.stderr.write(f"[{time_:11.6f}] {text}\n")
def write_sqlite(database, file2pkg):
connection = sqlite3.connect(database)
cursor = connection.cursor()
cursor.execute("CREATE TABLE file2deb(file, package)")
cursor.executemany("INSERT INTO file2deb VALUES(?, ?)", file2pkg.items())
connection.commit()
connection.close()
def write_dbm_gnu(database, file2pkg):
db = dbm.gnu.open(database, "cf")
for filename, package in file2pkg.items():
db[filename] = package
db.sync()
db.close()
def write_ndbm(database, file2pkg):
db = dbm.ndbm.open(database, "c")
for filename, package in file2pkg.items():
db[filename] = package
db.close()
def main(file):
log("pickle.load")
with open(f"{file}.pickle", "rb") as file2pkg_file:
file2pkg = pickle.load(file2pkg_file)
log("write sqlite3")
write_sqlite(f"{file}.db", file2pkg)
log("write DBM (GNU)")
write_dbm_gnu(f"{file}.dbm", file2pkg)
log("write DBM (NDBM)")
write_ndbm(f"{file}.ndbm", file2pkg)
log("done")
if __name__ == "__main__":
main("contents_mapping-jammy-amd64")
```
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https://bugs.launchpad.net/bugs/2073787
Title:
apport-retrace needs more than 1 GB
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https://bugs.launchpad.net/ubuntu/+source/apport/+bug/2073787/+subscriptions
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