With Oracle 11g OCI clients can store result sets on the client. I was wondering how ODP.NET will use this feature and if there are any coding constraints. Required setup: The feature must be enabled server side by setting the init.ora parameter client_result_cache_size (restart required) to the amout...

A few month ago I compared the .NET query notification possibilites between SQL Server and Oracle. At that time Oracle could only dectect changes at table level; not at row level. With the new release of ODP.NET 11.1 and Oracle 11g Oracle enhances the Query Notification support. Change detection can...

Lately I had a question in this Blog about an ORA-25408. My first thought was, that TAF and HA events should not be mixed. In order to confirm this, I wrote a small application with 3 connection possibilites 1. Normal connection 2. TAF connection with or without HA events 3. Connection with HA events...

SQL Server also offers an "array insert" possibility via .NET, which is called bulk copy . I wrote a similiar application as with the Oracle ODP.NET array insert. The point was not to compare Oracle vs. SQL Server, but to verify if the bulk copy is really faster than a normal insert via the...

ODP.NET supports array insert in two ways: 1. Binding arrays using ArrayBindCount cmd.Parameters.Add("firstname", OracleDbType.Varchar2, firstNames, ParameterDirection.Input); where firstNames is string[] 2. Binding to PL/SQL associative Arrays OracleParameter pFirstname = new OracleParameter...

Excellent presentation, but in German, about barrier free Web Design. Direct Google-Link ...read more

After the successfull RLB tests with RAC FAN events we re-tested the FCF with both Java and ODP.NET Startup As soon as the DBA puts an additional instance into a RAC service the client receives a FAN / FCF event. Both Java and .NET use the additional ...read more

My last RAC tests with runtime load balancing and .NET were not successful. ODP.NET always distributed the workload in a round robin manner. Now I know why: It is a AQ bug. I had more than one IP address defined (my real one and one for my vmWare). Since ...read more

Stefan Frutiger from Trivadis has extended my performance tests with linked server between SQL Server 2005 and Oracle 10g. First the hardware setup was enhanced: - 2 IBM laptops (T41 and T42) with W2003 and 1GB RAM - crossed cable as dedicated network ...read more

Because of some performance problems with Linked Severs between SQL Server and Oracle, I did some additional tests. I tested Microsoft SQL Server 2005 - 9.00.1399.06 (Intel X86) Oct 14 2005 00:33:37 Copyright (c) 1988-2005 Microsoft Corporation Developer ...read more

" Refactoring Databases" is a new book from Scott W. Ambler and Pramod J. Sadalage . They basically promote the agile development principles of software development into databases. The difficulty with databases is the fact, that we must manage ...read more

Agile Development puts people over processes. In my opinion this is a good trend, even though not completely new. Lately I was reading a very interesting blog about Agile Software Development at Google . I agree with the comments of many readers: Steve ...read more

With Oracle 10g R2 FAN and FCF we can load balance connections and requests over a "service". The service is defined to be run on one or more instances on the RAC. Services take a CLB_GOAL LONG or SHORT and are created with DBMS_SERVICE.CREATE_SERVICE ...read more

Lately we have done some tests with Oracle 10g R2 load balancing and connection failover for RAC. Both features are mainly useful for application servers. The bottom line: the JDBC driver from Oracle works, the ODP.NET provider not yet. Load balancing ...read more