SQL Standard vs. SQL Express

[mikebrewer]

Hey guys,

Hopefully not a dumb question here but I'm having difficulty understanding something with an application setup I have going right now...

I have an application that has a database behind it of roughly 500 MB in size. Not really big. I have a bunch of clients that I want to have this database in an offline mode so I have setup SQL Web Synchronization and this all works really well. The data gets back and forth between client and server flawlessly.

The problem I have is that when I use SQL Express on the client side, the application takes FOREVER to run queries. Here is an example of one of the queries:

strSQL = "SELECT * FROM myTable WHERE myTable.Field IN (" & Criteria & ") AND JobDate=#" & Me.CurrentDate & "#"
Me.Subform.Form.RecordSource = strSQL

This is built on a Microsoft Access frontend with SQL backend holding the data.

When I run this query against SQL Express, it takes forever to return say 2 or 3 records. But then when I run the same exact query against the full SQL Standard, it returns everything in a flash.

I know SQL Server Express has some limitations but I don't think what I'm doing would hit any of those limitations. Most of it is fairly straightforward and plain, in my opinion. Am I missing something in the way that Microsoft Access works with SQL editions? Anyone else ever have this type of problem?

 

[SQL_Hell]

Hi,

Did the database originate on SQL server standard edition and you put copy on SQL express and now you're having performance issues?

If so how did you copy it over?

 

[mikebrewer]

Yes, the database originated in SQL Standard (originally 2008, recently upgraded to 2014) and then was built into a SQL server Express on a client by using SQL Web replication (merge replication).

If the client runs Express, its slow as molasses. If I install SQL Standard, runs like a champ.

I don't think its poor query writing. I don't know if there is a setting that I need to change or something goofy that I'm missing.

Thanks!

 

[SQL_Hell]

Ok, so you updated the data via replication, but how were the tables built in the sql express database?

What I am wondering, is whether the indexes and primary keys were left out?

 

[mikebrewer]

Gotcha. The tables get built from a snapshot of the database that lives in SQL Standard on the main server. It is a replica. So if you were to go into SQL Management Console on the client (I installed the SQL Express version that includes the Management studio), you will see the same data structure that lives on the main server.

 

[SQL_Hell]

Ok, let's try and rule this out before we go any further, Can you run the following code on both environments and compare the outputs?

[FONT=Consolas][SIZE=2][COLOR=#0000ff][FONT=Consolas][SIZE=2][COLOR=#0000ff][FONT=Consolas][SIZE=2][COLOR=#0000ff]SELECT [/COLOR][/SIZE][/FONT][/COLOR][/SIZE][/FONT][/COLOR][/SIZE][/FONT][FONT=Consolas][SIZE=2][COLOR=#ff00ff][FONT=Consolas][SIZE=2][COLOR=#ff00ff][FONT=Consolas][SIZE=2][COLOR=#ff00ff]object_name[/COLOR][/SIZE][/FONT][/COLOR][/SIZE][/FONT][/COLOR][/SIZE][/FONT][FONT=Consolas][SIZE=2][COLOR=#808080][FONT=Consolas][SIZE=2][COLOR=#808080][FONT=Consolas][SIZE=2][COLOR=#808080]([/COLOR][/SIZE][/FONT][/COLOR][/SIZE][/FONT][/COLOR][/SIZE][/FONT][FONT=Consolas][SIZE=2][COLOR=#008080][FONT=Consolas][SIZE=2][COLOR=#008080][FONT=Consolas][SIZE=2][COLOR=#008080]idxstat[/COLOR][/SIZE][/FONT][/COLOR][/SIZE][/FONT][/COLOR][/SIZE][/FONT][FONT=Consolas][SIZE=2][COLOR=#808080][FONT=Consolas][SIZE=2][COLOR=#808080][FONT=Consolas][SIZE=2][COLOR=#808080].[/COLOR][/SIZE][/FONT][/COLOR][/SIZE][/FONT][/COLOR][/SIZE][/FONT][FONT=Consolas][SIZE=2][COLOR=#ff00ff][FONT=Consolas][SIZE=2][COLOR=#ff00ff][FONT=Consolas][SIZE=2][COLOR=#ff00ff]object_id[/COLOR][/SIZE][/FONT][/COLOR][/SIZE][/FONT][/COLOR][/SIZE][/FONT][FONT=Consolas][SIZE=2][COLOR=#808080][FONT=Consolas][SIZE=2][COLOR=#808080][FONT=Consolas][SIZE=2][COLOR=#808080]) [/COLOR][/SIZE][/FONT][/COLOR][/SIZE][/FONT][/COLOR][/SIZE][/FONT][FONT=Consolas][SIZE=2][COLOR=#0000ff][FONT=Consolas][SIZE=2][COLOR=#0000ff][FONT=Consolas][SIZE=2][COLOR=#0000ff]as [/COLOR][/SIZE][/FONT][/COLOR][/SIZE][/FONT][/COLOR][/SIZE][/FONT][FONT=Consolas][SIZE=2][COLOR=#008080][FONT=Consolas][SIZE=2][COLOR=#008080][FONT=Consolas][SIZE=2][COLOR=#008080]table_name
[/COLOR][/SIZE][/FONT][/COLOR][/SIZE][/FONT][/COLOR][/SIZE][/FONT][FONT=Consolas][SIZE=2][COLOR=#808080][FONT=Consolas][SIZE=2][COLOR=#808080][FONT=Consolas][SIZE=2][COLOR=#808080],[/COLOR][/SIZE][/FONT][/COLOR][/SIZE][/FONT][/COLOR][/SIZE][/FONT][FONT=Consolas][SIZE=2][COLOR=#008080][FONT=Consolas][SIZE=2][COLOR=#008080][FONT=Consolas][SIZE=2][COLOR=#008080]sidx[/COLOR][/SIZE][/FONT][/COLOR][/SIZE][/FONT][/COLOR][/SIZE][/FONT][FONT=Consolas][SIZE=2][COLOR=#808080][FONT=Consolas][SIZE=2][COLOR=#808080][FONT=Consolas][SIZE=2][COLOR=#808080].[/COLOR][/SIZE][/FONT][/COLOR][/SIZE][/FONT][/COLOR][/SIZE][/FONT][FONT=Consolas][SIZE=2][COLOR=#008080][FONT=Consolas][SIZE=2][COLOR=#008080][FONT=Consolas][SIZE=2][COLOR=#008080]name [/COLOR][/SIZE][/FONT][/COLOR][/SIZE][/FONT][/COLOR][/SIZE][/FONT][FONT=Consolas][SIZE=2][COLOR=#0000ff][FONT=Consolas][SIZE=2][COLOR=#0000ff][FONT=Consolas][SIZE=2][COLOR=#0000ff]as [/COLOR][/SIZE][/FONT][/COLOR][/SIZE][/FONT][/COLOR][/SIZE][/FONT][FONT=Consolas][SIZE=2][COLOR=#008080][FONT=Consolas][SIZE=2][COLOR=#008080][FONT=Consolas][SIZE=2][COLOR=#008080]index_name
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[/COLOR][/SIZE][/FONT][/COLOR][/SIZE][/FONT][/COLOR][/SIZE][/FONT][FONT=Consolas][SIZE=2][COLOR=#808080][FONT=Consolas][SIZE=2][COLOR=#808080][FONT=Consolas][SIZE=2][COLOR=#808080],[/COLOR][/SIZE][/FONT][/COLOR][/SIZE][/FONT][/COLOR][/SIZE][/FONT][FONT=Consolas][SIZE=2][COLOR=#008080][FONT=Consolas][SIZE=2][COLOR=#008080][FONT=Consolas][SIZE=2][COLOR=#008080]idxstat[/COLOR][/SIZE][/FONT][/COLOR][/SIZE][/FONT][/COLOR][/SIZE][/FONT][FONT=Consolas][SIZE=2][COLOR=#808080][FONT=Consolas][SIZE=2][COLOR=#808080][FONT=Consolas][SIZE=2][COLOR=#808080].[/COLOR][/SIZE][/FONT][/COLOR][/SIZE][/FONT][/COLOR][/SIZE][/FONT][FONT=Consolas][SIZE=2][COLOR=#008080][FONT=Consolas][SIZE=2][COLOR=#008080][FONT=Consolas][SIZE=2][COLOR=#008080]avg_fragmentation_in_percent [/COLOR][/SIZE][/FONT][/COLOR][/SIZE][/FONT][/COLOR][/SIZE][/FONT][FONT=Consolas][SIZE=2][COLOR=#0000ff][FONT=Consolas][SIZE=2][COLOR=#0000ff][FONT=Consolas][SIZE=2][COLOR=#0000ff]as [/COLOR][/SIZE][/FONT][/COLOR][/SIZE][/FONT][/COLOR][/SIZE][/FONT][FONT=Consolas][SIZE=2][COLOR=#008080][FONT=Consolas][SIZE=2][COLOR=#008080][FONT=Consolas][SIZE=2][COLOR=#008080]index_fragmentaion
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[/COLOR][/SIZE][/FONT][/COLOR][/SIZE][/FONT][/COLOR][/SIZE][/FONT][FONT=Consolas][SIZE=2][COLOR=#808080][FONT=Consolas][SIZE=2][COLOR=#808080][FONT=Consolas][SIZE=2][COLOR=#808080]INNER [/COLOR][/SIZE][/FONT][/COLOR][/SIZE][/FONT][/COLOR][/SIZE][/FONT][FONT=Consolas][SIZE=2][COLOR=#808080][FONT=Consolas][SIZE=2][COLOR=#808080][FONT=Consolas][SIZE=2][COLOR=#808080]JOIN [/COLOR][/SIZE][/FONT][/COLOR][/SIZE][/FONT][/COLOR][/SIZE][/FONT][FONT=Consolas][SIZE=2][COLOR=#008000][FONT=Consolas][SIZE=2][COLOR=#008000][FONT=Consolas][SIZE=2][COLOR=#008000]sys[/COLOR][/SIZE][/FONT][/COLOR][/SIZE][/FONT][/COLOR][/SIZE][/FONT][FONT=Consolas][SIZE=2][COLOR=#808080][FONT=Consolas][SIZE=2][COLOR=#808080][FONT=Consolas][SIZE=2][COLOR=#808080].[/COLOR][/SIZE][/FONT][/COLOR][/SIZE][/FONT][/COLOR][/SIZE][/FONT][FONT=Consolas][SIZE=2][COLOR=#008000][FONT=Consolas][SIZE=2][COLOR=#008000][FONT=Consolas][SIZE=2][COLOR=#008000]indexes [/COLOR][/SIZE][/FONT][/COLOR][/SIZE][/FONT][/COLOR][/SIZE][/FONT][FONT=Consolas][SIZE=2][COLOR=#008080][FONT=Consolas][SIZE=2][COLOR=#008080][FONT=Consolas][SIZE=2][COLOR=#008080]sidx
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Replace the red word "DatabaseName" with the name of your database and ensure the queries are running against the database, as opposed to "master" which is default.

What we are looking for here, is the same amount of indexes in both environments and that the indexes aren't suffering from any fragmentation.

 

[mikebrewer]

Sorry I haven't gotten back to this, I had some meetings today. It looks like I have some heavily fragmented indexes. I need to run the rebuild but unfortunately, I have to do that offline as I don't have the enterprise version of SQL. i'll try that out tonight and see if that helps or not. I have never done it so I'm sure it well past time that I do something about that!

 

[SQL_Hell]

Cool, sounds like a plan. If you need help with reindexing let me know.

You also need to update statistics after you run the reindex, because not all statistics will be updated when you issue the reindex.

However updating stats is easy, just run the following in SSMS against your database:

exec sp_updatestats

 

[mikebrewer]

So I did all that and on some of the tables, it will still show fragmentation. I also noticed that the forms that are slow are forms where I've got drop down menus and such that are linking to other tables.

For example, I have a form that loads that has a kind of complex query, but not really. its pulling all the customer orders up (which right now has one record in it) and also pull some information from the customer table and the customer authorized contacts table.

Then on the form itself, I've got a few dropdown menus that are linked.

On SQL Standard on my PC, form opens up in a flash. On SQL Express, it takes 30 seconds. This is after re-indexing, updating stats, etc.

 

[SQL_Hell]

Hmmm, did you run the query I gave you on both environments? and check the same amount of indexes?

SQL express can't be causing this slowdown, there must be something else up.

Regarding the indexes that won't defragment, they are probably being ignored because there is small amount of data in the tables

 

[mikebrewer]

it seems to be more prevalent on forms where I have drop-down menus. This means that the form has multiple tables it is referencing. the record source may be only one table but I may have 3 or 4 fields on that table that are keys on another table.

The example is the Customer Order Form... there is the customer order table which has the customer number field that is a drop down of our customer list. Then there is the authorized order person which is another table related to the customer number. Then there is a order item id which is yet another drop down.

I may try to bring a lot of that data locally to the application so it doesn't have to reference the database as much.