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  • Features for enabling and disabling WAL mode · 5 ✖

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id html_url issue_url node_id user created_at updated_at ▲ author_association body reactions issue performed_via_github_app
671151461 https://github.com/simonw/sqlite-utils/issues/132#issuecomment-671151461 https://api.github.com/repos/simonw/sqlite-utils/issues/132 MDEyOklzc3VlQ29tbWVudDY3MTE1MTQ2MQ== simonw 9599 2020-08-10T03:54:06Z 2020-08-10T03:54:06Z OWNER

For the moment I'll build it without the --retry mode.

 
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 Features for enabling and disabling WAL mode 675839512  
671151170 https://github.com/simonw/sqlite-utils/issues/132#issuecomment-671151170 https://api.github.com/repos/simonw/sqlite-utils/issues/132 MDEyOklzc3VlQ29tbWVudDY3MTE1MTE3MA== simonw 9599 2020-08-10T03:52:02Z 2020-08-10T03:52:02Z OWNER

I'm having trouble figuring out how to write a test that locks a SQLite database (so I can test that --retry actually works). I tried this recipe but it didn't seem to prevent another process from running pragma journal_mode='wal'; against that database:

```python import time import sys import sqlite3

filename = sys.argv[-1]

db = sqlite3.connect(filename) with db: db.execute("create table if not exists counter(id integer primary key, counter text)") time.sleep(100) ```

 
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 Features for enabling and disabling WAL mode 675839512  
671147344 https://github.com/simonw/sqlite-utils/issues/132#issuecomment-671147344 https://api.github.com/repos/simonw/sqlite-utils/issues/132 MDEyOklzc3VlQ29tbWVudDY3MTE0NzM0NA== simonw 9599 2020-08-10T03:29:00Z 2020-08-10T03:29:00Z OWNER

The CLI options should take multiple database files:

$ sqlite-utils enable-wal *.db

It's possible for this to fail if the DB is locked. How about a --retry option that causes it to retry a bunch of times if that happens?

 
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 Features for enabling and disabling WAL mode 675839512  
671147148 https://github.com/simonw/sqlite-utils/issues/132#issuecomment-671147148 https://api.github.com/repos/simonw/sqlite-utils/issues/132 MDEyOklzc3VlQ29tbWVudDY3MTE0NzE0OA== simonw 9599 2020-08-10T03:27:50Z 2020-08-10T03:27:50Z OWNER

https://www.sqlite.org/pragma.html#pragma_journal_mode lists six modes: DELETE | TRUNCATE | PERSIST | MEMORY | WAL | OFF

I'm only going to implement utilities for DELETE (wal-off) and WAL (wal-on) - the other modes look like they're for specialist purposes that I don't need to support.

If it turns out I do need them I can add those to sqlite-utils later.

 
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 Features for enabling and disabling WAL mode 675839512  
671146948 https://github.com/simonw/sqlite-utils/issues/132#issuecomment-671146948 https://api.github.com/repos/simonw/sqlite-utils/issues/132 MDEyOklzc3VlQ29tbWVudDY3MTE0Njk0OA== simonw 9599 2020-08-10T03:26:51Z 2020-08-10T03:26:51Z OWNER

For the CLI:

$ sqlite-utils enable-wal github.db
$ sqlite-utils disable-wal github.db

For the Python library:

```python import sqlite_utils

db = sqlite_utils.Database("github.db") db.enable_wal() db.disable_wal() mode = db.journal_mode # "wal" or "delete" or others ```

 
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 Features for enabling and disabling WAL mode 675839512  

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