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Frequently Asked Questions
  Q: Under what license PGNP is published?
  A: PGNP (PostgreSQL Native Provider) is published under commercial software product license. It is a closed code proprietary software. It is not freeware, shareware, or open source software. In order to use it you would need to purchase a license.
  Q: Which versions of PostgreSQL are compatible to / supported by the Provider?
  A: We are testing PGNP Provider with PostgreSQL 8.2 and later (e.g. 8.4 and 9.X). Some of our customers reported that they successfully used the Provider with versions 8.0 and 8.1. However, please make sure that provider works with your version of PostgreSQL before the purchase.
  Q: How can I disable trial limitations in the trial version of the provider? Do I need to purchase a license for it?
  A: There is no way to deactivate or disable trial limitations in the trial version of the provider. If you need non trial version you would need to purchase a license and you would get non trial version from us.
  Q: What kind of limitations do you have in the trial version?

The trial version has the following limitations:
1. SELECT statements return up to 100 rows.
2. Database conversion in DTS/SSIS Wizard handles only first 100 rows in every table.
The trial is also popping up a reminder dialog once a day (when connection to a database is being made).

  Q: My application is written in C#, I am using .NET provider to access my data, what would I get if I switch to PGNP instead?
  A: Any .NET provider supports only subset of OLEDB interfaces. There is no way for example to use .NET providers for DTS/SSIS transformations. Also many reporting and management tools can only use OLEDB providers to access data in databases. .NET providers do not support server side cursors. .NET providers are written in managed code and can not outperform hand optimized native code. Obviously if you need to access PostgreSQL from native code (C++, Delphi, VB) then PGNP would be the only choice.
  Q: Do you support DTS/SSIS transformation from X to Y database?
  A: We have tested many databases transformations from SQL Server and Oracle to PostgreSQL. We believe this represents the most common scenario for DTS/SSIS. We have tested transformations from PostgreSQL to SQL Server and Oracle as well, but not as extensively. Since DTS/SSIS transformations rely on OLEDB data types mapping PGNP should work with any DB with properly written OLEDB provider.
  Q: What do you map SQL Server GUID data type to?
  A: After extensive research we decided to map it to Base64 encoded fixed-length (22) character field. Starting with version 1.2.8 and PostgreSQL 8.3 GUID is mapped to UUID field.
  Q: What are the System Requirements?
  A: PGNP provider is compatible with Window 2000, 2003, 2008, XP, Vista or later OS. We recommend MDAC 2.8 or later to be installed. Since provider does not consume any significant amount of memory or CPU cycles, the specific hardware requirements should be defined by an application used. For example, replicatrion of a large MS SQL Server database may require 8GB or more memory on the server.
  Q: Any implementation details?
  A: PGNP is written using MS C++ (VS 2005) with key functions implemented in hand optimized assembler. COM implemented using ATL and SQL is handled by state of the art SQL parser. For a fee more details can be obtained under NDA including purchase of the source code.
   Q: My application cannot open connection to a database using PGNP. What is the reason?

First, check if the server is accepting connections on the standard port: 5432. If non-standard port is used then specify it in the connection string: Extended Properties="PORT=7656".

Second, in case PostgreSQL server is running on a remote computer, check firewall settings and configuration in pg_hba.conf (to enable remote connections). See PostgreSQL documentation for more details.

We usually recommend using a UDL file for testing connectivity via PGNP provider. For this, create an empty file test.udl on Desktop. Double click on the file and, in Data Link Properties dialog, select "PostgreSQL Native Provider" and the parameters of connection in second tab. Click "Test Connection" button.

If connection test fails please check Postgres logs, and see if connection attempt was made, and why it was refused.


Why a simple query on a Linked Server table with 100 million rows results in unusually long execution time? Here is query example: SELECT TOP 20 * FROM [LINKSVR]...[bigtable]

   A: Please rewrite the query using openquery syntax:
SELECT * FROM openquery(LINKSVR, "SELECT TOP 10 * FROM bigtable")

The original query with "4-part identifiers" caches all rows from a table. The openquery is much more efficient. For stored procedures and SQL commands consider using Exec ... At... syntax.
   Q: Why updating a very large table via Linked Server results in Timeout error? Here is command example: SELECT 1 FROM OPENQUERY(LINKSVR,'UPDATE "bigtable" SET "IsActive"=True WHERE "UserId"=960 AND "Client"=True AND "IsActive"= False and "ris"=True and "rwcl"=True')
OLE DB provider "PGNP" for linked server "LINKSVR" returned message "timeout expired".
   A: The issue is caused by default command timeout that is equal to 30 seconds. Please add COMMAND_TIMEOUT=0 parameter to the Extended Properties in connection string.

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