Entity Framework Optimization Techniques in EF Execute multiple queries async and in parallel
Example
When using async queries, you can execute multiple queries at the same time, but not on the same context. If the execution time of one query is 10s, the time for the bad example will be 20s, while the time for the good example will be 10s.
Bad Example
IEnumerable<TResult1> result1;
IEnumerable<TResult2> result2;
using(var context = new Context())
{
result1 = await context.Set<TResult1>().ToListAsync().ConfigureAwait(false);
result2 = await context.Set<TResult1>().ToListAsync().ConfigureAwait(false);
}
Good Example
public async Task<IEnumerable<TResult>> GetResult<TResult>()
{
using(var context = new Context())
{
return await context.Set<TResult1>().ToListAsync().ConfigureAwait(false);
}
}
IEnumerable<TResult1> result1;
IEnumerable<TResult2> result2;
var result1Task = GetResult<TResult1>();
var result2Task = GetResult<TResult2>();
await Task.WhenAll(result1Task, result2Task).ConfigureAwait(false);
var result1 = result1Task.Result;
var result2 = result2Task.Result;
