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learn-build-service-prod merged 1 commit into from
Jan 9, 2026
Merged

Auto Publish – main to live - 2026-01-09 17:00 UTC #5235

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6 changes: 3 additions & 3 deletions entity-framework/core/providers/cosmos/querying.md
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Original file line number Diff line number Diff line change
Expand Up @@ -48,7 +48,7 @@ protected override void OnModelCreating(ModelBuilder modelBuilder)
}

var tenantId = "Microsoft";
var userId = new Guid("99A410D7-E467-4CC5-92DE-148F3FC53F4C");
var userId = new Guid("00aa00aa-bb11-cc22-dd33-44ee44ee44ee");
var username = "scott";

var sessions = await context.Sessions
Expand All @@ -63,7 +63,7 @@ var sessions = await context.Sessions
Examining the logs generated by EF, we see this query executed as follows:

```sql
Executed ReadNext (166.6985 ms, 2.8 RU) ActivityId='312da0d2-095c-4e73-afab-27072b5ad33c', Container='test', Partition='["Microsoft","99a410d7-e467-4cc5-92de-148f3fc53f4c"]', Parameters=[]
Executed ReadNext (166.6985 ms, 2.8 RU) ActivityId='312da0d2-095c-4e73-afab-27072b5ad33c', Container='test', Partition='["Microsoft","00aa00aa-bb11-cc22-dd33-44ee44ee44ee"]', Parameters=[]
SELECT VALUE c
FROM root c
WHERE ((c["SessionId"] > 0) AND CONTAINS(c["Username"], "a"))
Expand Down Expand Up @@ -105,7 +105,7 @@ var session = await context.Sessions.SingleAsync(
In this query, a value for the `Id` property is provided (which is mapped to the Azure Cosmos DB `id` property), as well as values for all the partition key properties. Furthermore, there are no additional components to the query. When all these conditions are met, EF is able to execute the query as a point read:

```console
Executed ReadItem (46 ms, 1 RU) ActivityId='d7391311-2266-4811-ae2d-535904c42c43', Container='test', Id='9', Partition='["Microsoft","99a410d7-e467-4cc5-92de-148f3fc53f4c",10.0]'
Executed ReadItem (46 ms, 1 RU) ActivityId='d7391311-2266-4811-ae2d-535904c42c43', Container='test', Id='9', Partition='["Microsoft","00aa00aa-bb11-cc22-dd33-44ee44ee44ee",10.0]'
```

Note the `ReadItem`, which indicates that the query was executed as an efficient point read - no SQL query is involved.
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4 changes: 2 additions & 2 deletions entity-framework/core/what-is-new/ef-core-9.0/whatsnew.md
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Expand Up @@ -133,13 +133,13 @@ When executing this query, EF Core will extract the values of the `tenantId`, `u

```output
info: 6/10/2024 19:06:00.017 CosmosEventId.ExecutingSqlQuery[30100] (Microsoft.EntityFrameworkCore.Database.Command)
Executing SQL query for container 'UserSessionContext' in partition '["Microsoft","99a410d7-e467-4cc5-92de-148f3fc53f4c",7.0]' [Parameters=[]]
Executing SQL query for container 'UserSessionContext' in partition '["Microsoft","00aa00aa-bb11-cc22-dd33-44ee44ee44ee",7.0]' [Parameters=[]]
SELECT c
FROM root c
WHERE ((c["Discriminator"] = "UserSession") AND CONTAINS(c["Username"], "a"))
```

Notice that the partition key comparisons have been removed from the `WHERE` clause, and are instead used as the partition key for efficient execution: `["Microsoft","99a410d7-e467-4cc5-92de-148f3fc53f4c",7.0]`.
Notice that the partition key comparisons have been removed from the `WHERE` clause, and are instead used as the partition key for efficient execution: `["Microsoft","00aa00aa-bb11-cc22-dd33-44ee44ee44ee",7.0]`.

For more information, see the documentation on [querying with partition keys](xref:core/providers/cosmos/querying#partition-keys).

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