What steps would you take if a delay in receiving data from the database causes problems in the application?

If delays in retrieving data from the database cause problems, the following steps can be taken:

1. Query optimization: check and improve SQL queries, add indexes, remove redundant operations.
2. Asynchronous operations: use asynchronous data access methods (e.g., async/await in C#) to avoid blocking the UI or main thread.
3. Caching: store frequently used data in memory or local storage to reduce the number of database requests.
4. Pagination and lazy loading: load data in parts rather than all at once.
5. Profiling and monitoring: use tools to analyze database and application performance.

Example of an asynchronous request in C#:

public async Task<List<User>> GetUsersAsync()
{
    using(var context = new AppDbContext())
    {
        return await context.Users.ToListAsync();
    }
}