#33153 closed Bug (duplicate)
"database table is locked" error on SQLite when testing with mirror database
Reported by: | Adam Johnson | Owned by: | nobody |
---|---|---|---|
Component: | Testing framework | Version: | dev |
Severity: | Normal | Keywords: | |
Cc: | Triage Stage: | Unreviewed | |
Has patch: | no | Needs documentation: | no |
Needs tests: | no | Patch needs improvement: | no |
Easy pickings: | no | UI/UX: | no |
Description (last modified by )
Requirements:
- project uses SQLite for database
- has a "replica" db alias set up as test mirror of default
TestCase
hasdatabases = ["default", "replica"]
- Model is either from or two in a FK relationship
TestCase
tries to create an instance of that model
Result: The SQLite foreign key check, PRAGMA foreign_key_check
, fails with an OperationalError
like:
Traceback (most recent call last): File "/.../site-packages/django/test/testcases.py", line 278, in _setup_and_call self._post_teardown() File "/.../site-packages/django/test/testcases.py", line 1023, in _post_teardown self._fixture_teardown() File "/.../site-packages/django/test/testcases.py", line 1266, in _fixture_teardown connections[db_name].check_constraints() File "/.../site-packages/django/db/backends/sqlite3/base.py", line 322, in check_constraints violations = cursor.execute('PRAGMA foreign_key_check').fetchall() File "/.../site-packages/django/db/backends/utils.py", line 66, in execute return self._execute_with_wrappers(sql, params, many=False, executor=self._execute) File "/.../site-packages/django/db/backends/utils.py", line 75, in _execute_with_wrappers return executor(sql, params, many, context) File "/.../site-packages/django/db/backends/utils.py", line 84, in _execute return self.cursor.execute(sql, params) File "/.../site-packages/django/db/utils.py", line 90, in __exit__ raise dj_exc_value.with_traceback(traceback) from exc_value File "/.../site-packages/django/db/backends/utils.py", line 82, in _execute return self.cursor.execute(sql) File "/.../site-packages/django/db/backends/sqlite3/base.py", line 414, in execute return Database.Cursor.execute(self, query) django.db.utils.OperationalError: database table is locked: core_author
Reproduction project: https://github.com/adamchainz/django-ticket-33153 . Simply run ./manage.py test
to see the above exception.
Removing the FK from the model, the "replica"
entry in AuthorTests.databases
, or the mirror declaration in settings.py:DATABASES
causes the test to pass.
Change History (4)
comment:1 by , 3 years ago
Description: | modified (diff) |
---|
comment:2 by , 3 years ago
Severity: | Release blocker → Normal |
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Version: | 4.0 → dev |
comment:3 by , 3 years ago
Resolution: | → duplicate |
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Status: | new → closed |
I think it's a duplicate of #23718. TEST['MIRROR']
requires TransactionTestCase
to work with multiple databases.
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Okay so this actually reproduces back to Django 2.2 with the example repo. That makes sense since it was when end-of-test checking of deferrable database constraints was added for SQLite.
It looked like a Django 4.0 specific issue to me because it only started occurring for me when adding Django 4.0 support to django-perf-rec (PR). I will try work out why it hasn't failed on 2.2 onwards....
Edit: the reason was obvious - I added the mirror DB to the failing test's
TestCase.databases
on the 4.0 branch.