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Documentation Select Features Documentation of features often looked for. Download this Manual. SQLite provides an excellent development alternative for applications that are predominantly read-only or require a smaller installation footprint. As with all database servers, though, there are some differences that are specific to SQLite that you should be aware of.

For all SQLite versions, there is some slightly counter-intuitive behavior when attempting to match some types of strings. These are triggered when using the iexact or contains filters in Querysets. The behavior splits into two cases:. For substring matching, all matches are done case-insensitively. For strings containing characters outside the ASCII range, all exact string matches are performed case-sensitively, even when the case-insensitive options are passed into the query. So the iexact filter will behave exactly the same as the exact filter in these cases.

Some possible workarounds for this are documented at sqlite. Thus, Django exposes the default SQLite behavior and you should be aware of this when doing case-insensitive or substring filtering.

SQLite has no real decimal internal type. OperationalError: database is locked errors indicate that your application is experiencing more concurrency than sqlite can handle in default configuration.

This error means that one thread or process has an exclusive lock on the database connection and another thread timed out waiting for the lock the be released. Switching to another database backend. Rewriting your code to reduce concurrency and ensure that database transactions are short-lived. Increase the default timeout value by setting the timeout database option:. Calling it will have no effect. For most backends, raw queries Manager. SQLite does not support this. If a row is added, changed, or deleted within the loop, then that row may or may not appear, or may appear twice, in subsequent results fetched from the iterator.

Your code must handle this. If the extension is not enabled on your installation, a system error fields. E will be raised. To enable the JSON1 extension you can follow the instruction on the wiki page. Django supports Oracle Database Server versions Version 6. In order for the python manage. The Oracle database backend uses the SYS. To connect using the service name of your Oracle database, your settings.

Django will use a different connect descriptor depending on that choice. This format is required when using RAC or pluggable databases without tnsnames. If you plan to run Django in a multithreaded environment e. Apache using the default MPM module on any modern operating system , then you must set the threaded option of your Oracle database configuration to True :. Oracle imposes a name length limit of 30 characters. To accommodate this, the backend truncates database identifiers to fit, replacing the final four characters of the truncated name with a repeatable MD5 hash value.

Additionally, the backend turns database identifiers to all-uppercase. Django quotes all identifiers used in queries to prevent most such problems, but this error can still occur when an Oracle datatype is used as a column name. In particular, take care to avoid using the names date , timestamp , number or float as a field name.

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