SQL Server 2019: Unexpectedly Slow Performance with Indexed Views
I'm working on a project and hit a roadblock. I'm working on a personal project and I'm learning this framework and I'm converting an old project and I'm confused about I've encountered a strange issue with I'm encountering significant performance issues when querying an indexed view in SQL Server 2019..... The view aggregates data from multiple tables and includes a WHERE clause to filter records based on a date range. Despite having an index on the view, the query execution time seems to be ten times longer than expected compared to running the same query directly on the base tables. Here’s the SQL for the indexed view: ```sql CREATE VIEW dbo.MyIndexedView WITH SCHEMABINDING AS SELECT TableA.ID, SUM(TableB.Amount) AS TotalAmount FROM dbo.TableA JOIN dbo.TableB ON TableA.ID = TableB.TableA_ID WHERE TableB.TransactionDate >= '2023-01-01' AND TableB.TransactionDate < '2023-12-31' GROUP BY TableA.ID; CREATE UNIQUE CLUSTERED INDEX IDX_MyIndexedView ON dbo.MyIndexedView(ID); ``` When I run the following query: ```sql SELECT * FROM dbo.MyIndexedView WHERE ID = 1; ``` It takes about 5 seconds to return results. However, if I run: ```sql SELECT ID, SUM(Amount) AS TotalAmount FROM dbo.TableB WHERE TransactionDate >= '2023-01-01' AND TransactionDate < '2023-12-31' GROUP BY ID HAVING ID = 1; ``` This returns results in about 0.5 seconds. I've tried updating statistics and rebuilding indexes, but the performance issue persists. Also, I've looked into the execution plans, and the indexed view's query seems to be utilizing a nested loop join, which feels inefficient given the data size. Is there something specific about indexed views in SQL Server 2019 that could be affecting performance? Are there any best practices I might have overlooked that could help improve the query speed? For context: I'm using Sql on Ubuntu. What's the best practice here? I've been using Sql for about a year now. I'd love to hear your thoughts on this. I recently upgraded to Sql LTS. I'm working on a application that needs to handle this. Any help would be greatly appreciated! For reference, this is a production REST API. What am I doing wrong?