I've recently been upgraded to Office 2007. I have several Access databases (that I've kept in the Access 2000 format for several reasons) that are linked to SQL Server 2000 databases. I have dozens of queries in these databases that I use often. I create new queries daily, sorting, summarizing and generally analyzing the data.
Since the upgrade, some queries take an extremely long time to complete (minutes rather than seconds), and one new one I've tried to run doesn't complete at all, I have to end task on Access. It's a rather simple query, it joins 3 tables, and sorts on one of the fields. I do this ALL THE TIME, and now it appears I can't.
I've searched for discussions of similar problems, but haven't seen specific recommendations.
Any ideas?
I would suggest deleting all your ODBC linked tables and recreating them from scratch as a starting point.
If your queries do not need to make any changes to the data you may find converting them to SQL Pass through queries will speed them up considerable. Note these queries are not parsed through the Jet DB Engine but sent directly to the server and bypass any linked tables.
You will have to use MS SQL syntax and lose the QBE grid though and the result will be read only.
If you need to update data then maybe stored procedures are the way to go.
When I converted to SQL Server backend, I used SQL Server Migration Assistant. I recommend it highly. It's very good at what it does.
Having said that, I assume you're using linked tables in your FE. I convert slow-moving queries by copying the SQL from Access, then pasting it into a "new query" window on SQL Server Management Studio. Then, working through all the syntax changes one at a time, I convert the query to T-SQL and save it as a view with the same name as the query in Access.
I have a little routine that then renames the Access query to "Local_" and then creates a linked table entry to the view on SQL Server. You'll find that a query that used to run for minutes will run for seconds this way. You can, of course, do this manually.
SQL Server Migration Assistant, by the way, will convert many queries (it doesn't try to convert action queries, only select queries...) with little or no intervention.
I would use Access Data Projects with SQL Server 2000. It works great when your SQL backend is that old.
Related
I've been handed an interesting question in that an Apple centric user would be keen to run databases on Filemaker Pro and we already have several running on MS SQL.
FM Pro is visually stunning and as a front end to work with customers would look good, but I'm more SQL at heart.
Does anybody use both?
Can you easily run tasks between SQL and FM Pro to update data to FM Pro (say overnight)?
Has anybody made the change from SQL to FM Pro for any purpose and found it to be ok?
Thanks in advance
To expand on user4166144's answer a bit, you can add MS SQL as an external data source to FileMaker using ODBC. (See "Using FileMaker Pro, I want to create a live connection to a MS SQL Server, Oracle or MySQL data source.")
This will let you base layouts on an MS SQL table just as though it was a native FileMaker table. That is, the data will be "live", with no need for over-night copying about.
There are some limitations to ODBC connections, which will probably be irrelevant in your case. Mostly, ODBC data sources in FileMaker don't get all the FileMaker goodies in Manage Database. Tables from ODBC sources are "shadow tables". For example, if you delete a field ("column") in FileMaker, it doesn't get deleted in the SQL database. However, creating, editing, and deleting records all work as normal. You can even add tables from ODBC sources to the relationship graph, which is the primary way that you get data from multiple tables in FileMaker.
FileMaker is a little hard to wrap your head around coming from an SQL background. It's meant for rapid application development, and as such it has certain paradigms in mind. Here are a few things to know that I hope will help:
Every user interface ("Layout") in FileMaker is based on a table occurrence. The body of a layout represents a single record in that table occurrence. Every script, calculation and related piece of data is calculated from the perspective of that single record in that single table occurrence. That is, a layout is a "cursor".
There is no (sane) FileMaker way to do the equivalent of an SQL "OR" when it comes to the Relationship Graph.
FileMaker 12 has two features with very similar names. It has a calculation function "ExecuteSQL", which allows you to run SELECT statements on table occurrences in FileMaker; that includes ODBC sources. It also has a script step called "Execute SQL", which is handy for running arbitrary SQL against an ODBC data source. This latter is probably going to be very useful for you.
It's somewhat hard to get the results of SQL queries onto FileMaker layouts in any kind of elegant way. Generally, you need to write the results to a global field, a global variable, or a regular field. If you want to display tabular data from an SQL query in a decent kind of way, you will need to generate HTML and spit it into data url in a Web Viewer element on a layout (i.e., prefix the HTML with "data:text/html,")
FileMaker, since version 9, includes the ability to connect to a number of SQL databases without resorting to using SQL, including MySQL, SQL Server, and Oracle. This requires installation of the SQL database ODBC driver to connect to a SQL database. SQL databases can be used as data sources in FileMaker’s relationship graph, thus allowing the developer to create new layouts based on the SQL database; create, edit, and delete SQL records via FileMaker layouts and functions; and reference SQL fields in FileMaker calculations and script steps. It is a cross platform relational database application.
Versions from FileMaker Pro 5.5 onwards also have an ODBC interface.
FileMaker 12 introduced a new function, ExecuteSQL, which allows the user to perform an SQL query against the FileMaker database to retrieve data, but not for modification or deletion, or schema changes.
We have an AS400 mainframe running our DB2 transactional database. We also have a SQL Server setup that gets loaded nightly with data from the AS400. The SQL Server setup is for reporting.
I can link the two database servers, BUT, there's concern about how big a performance hit DB2 might suffer from queries coming from SQL Server.
Basically, the fear is that if we start hitting DB2 with queries from SQL Server we'll bog down the transactional system and screw up orders and shipping.
Thanks in advance for any knowledge that can be shared.
Anyone who has a pat answer for a performance question is wrong :-) The appropriate answer is always 'it depends.' Performance tuning is best done via measure, change one variable, repeat.
DB2 for i shouldn't even notice if someone executes a 1,000 row SELECT statement. Take Benny's suggestion and run one while the IBM i side watch. If they want a hint, use WRKACTJOB and sort on the Int column. That represents the interactive response time. I'd guess that the query will be complete before they have time to notice that it was active.
If that seems unacceptable to the management, then perhaps offer to test it before or after hours, where it can't possibly impact interactive performance.
As an aside, the RPG guys can create Excel spreadsheets on the fly too. Scott Klement published some RPG wrappers over the Java POI/HSSF classes. Also, Giovanni Perrotti at Easy400.net has some examples of providing an Excel spreadsheet from a web page.
I'd mostly agree with Buck, a 1000 row result set is no big deal...
Unless of course the system is looking through billions of rows across hundreds of tables to get the 1000 rows you are interested in.
Assuming a useful index exists, 1000 rows shouldn't be a big deal. If you have IBM i Access for Windows installed, there's a component of System i Navigator called "Run SQL Scripts" that includes "Visual Explain" that provides a visual explanation of the query execution plan. View that you can ensure that an index is being used.
On key thing, make sure the work is being done on the i. When using a standard linked table MS SQL Server will attempt to pull back all the rows then do it's own "where".
select * from MYLINK.MYIBMI.MYLIB.MYTABE where MYKEYFLD = '00335';
Whereas this format sends the statement to the remote server for processing and just gets back the results:
select * from openquery(MYLINK, 'select * from mylib.mytable where MYKEYFLD = ''00335''');
Alternately, you could ask the i guys to build you a stored procedure that you can call to get back the results you are looking for. Personally, that's my preferred method.
Charles
Is it possible to build a generic query that verifies and if needed corrects a whole table schema?
Example:
On my dev machine i have a sql server with some tables. I, and others, make changes to the tables and sometimes misses to notify the others about them. :/
I want to build a query that reads the dev sql tables and creates a query that i can run one another sql server and updates that table there so that they are equal.
I cant drop the table and recreate it unfortunately. I dont want to change any of the data.
If this is to hard with sql syntax is there some tools that can do this for me? The sql tables are almost always on different machines and most likely i cant connect directly to them from the same place. So tha fixing/verifying needs to be done "offline".
Time is not of the essence, it can be a very slow query as long as it works.
update: I want to verify the sql schema and not the content of the table
update2: We are using SQL Server 2008 R2
It is possible, but not easy. This kind of tool is called a Data Dictionary, and you can write one yourself (see advice from the Database Programmer) or you can buy a commercial one, for example RedGate's SQL Compare.
I'm working on a legacy project, written for the most part in Delphi 5 before it was upgraded to Delphi 2007. A lot has changed after this upgrade, except the database that's underneath. It still uses MS-Access for data storage.
Now we want to support SQL Server as an alternate database. Still just for single-user situations, although multi-user support will be a feature for the future. And although there won't be many migration problems (see below) when it needs to use a different database, keeping two database structures synchronized is a bit of a problem.
If I would create an SQL script to generate the SQL Server database then I would need a second script to keep the Access database up-to-date too. They don't speak the same dialect. (At least, not for our purposes.) So I need a way to maintain the database structure in a simple way, making sure it can generate both a valid SQL Server database as an Access database. I could write my own tool where I store the database structure inside an XML file, which combined with some smart code and ADOX would generate both database types.
But isn't there already a good tool that can do this?
Note: the application also uses ADO and all queries are just simple select statements. Although it has 50+ tables, there's one root "Document" table and the user selects one of the "documents" in this table. It then collects all records from all tables that are related to this document record and stores them in an in-memory structure. When the user saves the data, it just writes the document record and all changed data back to the database again. Basically, this read/write mechanism of documents is the only database interaction in the whole application. So using a different database is not a big problem.
We will drop the MS-Access database in the future but for now we have 4000 customers using this application. We first need to make sure the whole thing works with SQL Server and we need to continue to maintain the current code. As a result, we will have to support both databases for at least a year.
Take a look at the DB Explorer, there is a trial download too.
OR
Use migration wizard from MS Access to SQL Server
After development in Access (schema changes), use the wizard again.
Use a tool to compare SQL Server schemata.
Are there any good database schema comparison tools out there that support Sybase SQL Anywhere version 10? I've seen a litany of them for SQL Server, a few for MySQL and Oracle, but nothing that supports SQL Anywhere correctly.
I tried using DB Solo, but it turned all my non-unique indexes into unique ones, and I didn't see any options to change that.
If you are willing to download SQL Anywhere Version 11, and Compare It!, check out the comparison technique shown here:
http://sqlanywhere.blogspot.com/2008/08/comparing-database-schemas.html
You don't have to upgrade your SQL Anywhere Version 10 database.
The new kid on the block is Qwerybuilder. It supports SQL Server, Sybase ASE, Sybase SQL Anywhere and Oracle. I've used it successfully with SQL Anywhere to track schema changes.
Two I've come across that support SQL Anywhere:
Upscene Database Workbench - http://www.upscene.com/products.dbw.sqlanywhere.php
Aquafold - http://www.aquafold.com/index-sybaseany.html
Each one appears has a schema comparison tool, however I have not used either to compare schemas.
SQLDelta is awesome. It is for SQL Server. I've used it with SQL 2000 and 2005. It will compare stored procedures, tables, views, permissions, indexes, etc. It can also compare data between tables I believe. You can sync the changes or generate SQL Scripts for later use. I use it often to script out db changes in development to production.
Ah...missed the Sybase remark. Not sure if SQLDelta can talk to it..but I'd probably give it a shot since Sybase is similar.
Try erwin (CA AllFusion ERwin Data Modeler). It supports quite a lot of different DBs, including SQL Anywhere, and is quite good in reverse/forward engineering and schema comparison. However, you may find it a bit too complex to use for the comparison...
I use SQL Data Compare from Red Gate along with SQL Compare the data compare allows you to Compare the contents of two databases and Automatically synchronize your data.
SQL compare allows you to do the same but with the database tables. Nice GUI on each and very easy setup. they also work on a remote database.
There not cheap but each has a 30 trail so you can get a feel if you like it or not.
Sybase PowerDesigner can also Compare or Merge your Database Schema.
It can also Load the Schema from various Databases by ODBC if you have Schema generation Scripts you can also load them into a Model.
Its an expensive tool but great to document and develop you schema changes IMHO.
Breck Carter's idea is a good one. For quick scans, I have an old product that is called DBDelta. I have it installed on an old Windows 2000 machine because the install I have will not work on an XP machine. It's a very small app that compares two SQL Anywhere databases across an ODBC connection.
I've done some searches to try and find a later copy, but have not been able to. The developer was Charles Butcher. I think he supported it for a while and then stopped back in 2002 or so.
I'll continue to look for a link. If I find something I will post it here.
QweryBuilder 5.5.0 will allow you to compare all procedures, functions, views, tables and triggers in one shot. This release is scheduled for mid May, 2010.
It hasn't been finalized yet but we are also looking at adding an option to turn the diff results into a script that can be executed on a target database.