Opened 7 months ago
Last modified 7 months ago
#35596 assigned Bug
Database access optimization warning that get() can retrieve hundreds or thousands of records is outdated
| Reported by: | Francisco Couzo | Owned by: | Ripoohann S Kumar |
|---|---|---|---|
| Component: | Documentation | Version: | |
| Severity: | Normal | Keywords: | |
| Cc: | Francisco Couzo | Triage Stage: | Accepted |
| Has patch: | no | Needs documentation: | no |
| Needs tests: | no | Patch needs improvement: | no |
| Easy pickings: | no | UI/UX: | no |
Description
Second, the lookup doesn’t guarantee that only one object will be returned. If the query matches more than one object, it will retrieve and transfer all of them from the database. This penalty could be substantial if hundreds or thousands of records are returned. The penalty will be compounded if the database lives on a separate server, where network overhead and latency also play a factor.
This was modified 5 years ago in commit 330638b89f14e1fb06e9d313ccc9768ae167c53f
There is one specific case when get() can return all the result set, which is when using the oracle db and select_for_update
Change History (2)
comment:1 by , 7 months ago
| Owner: | set to |
|---|---|
| Status: | new → assigned |
comment:2 by , 7 months ago
| Summary: | Database access optimization page has outdated info → Database access optimization warning that get() can retrieve hundreds or thousands of records is outdated |
|---|---|
| Triage Stage: | Unreviewed → Accepted |
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A docs link for reference: https://docs.djangoproject.com/en/5.0/topics/db/optimization/#retrieve-individual-objects-using-a-unique-indexed-column
Agreed an update here would be nice, thank you for the report 👍 refs #6785