12/6/2023 0 Comments Postgresql create database slave![]() Now sit back and watch your MSSQL data first being bulk-loaded into PostgreSQL, and then transactionally replicated (you will see a couple of seconds delay after a commit, same as when you replicate between two SQL Servers).Click Next through the rest of the wizard, make sure to check the box for Start snapshot agent.Select the created subscriber (PGSLAVE). ![]() Click next through the rest of the Wizard, and click Finish.Possibly modify description if you want to, click Next.This will happen if you have any IDENTITY columns in your table. You will get a warning about IDENTITY properties not being replicated to subscribers.Put a checkbox on the tables to replicate (tab1 in this example).In some cases it will work with drop and recreate, but I prefer creating the tables manually to make sure there is no mixup with datatypes and such (considering MSSQL doesn't really know about PostgreSQL datatypes) Change name conflicts to Keep existing table unchanged.Uncheck SQL Server 2000 and check Heterogeneous data sources, click Next.Select Transactional publication, click Next.Right-click Publication under Replication and select New publication.Pick the linked server you created (PGSLAVE).Right-click on the Replication node and select Configure publishing, subscribers, and distribution.Make sure the link works by clicking the Tables node and verify that you can see the tables of you database. Finally, enter the name of the ODBC datasource just created. Note that you should not pick the PostgreSQL ODBC driver here. ![]() Enter the name of the linked server (in all uppercase, in our case PGSLAVE), and pick the driver Microsoft OLE DB Provider for ODBC Drivers. This is done by right-clicking the Linked Servers node under Security and picking New Linked Server. Make sure that you create a system datasource, and make sure you use the PostgreSQL ANSI driver (there are some problems with the UNICODE driver in the way SQL Server uses it) ![]() Make sure you have the PostgreSQL ODBC drivers installed on the SQL Server machine (I'm using version 8.01.02).ĬREATE TABLE tab1(id int not null primary key, t varchar(128) not null) Ĭreate a ODBC System Datasource on the SQL Server. Make sure that this user has permissions to connect from the SQL Server machine in pg_hba.conf. It expects you to set up a user named sqlrepl in the PostgreSQL database, that the replication system will use to connect with. Here are the steps to do this for a simple example database - should work for more complex database as well of course. It's master/slave only, and SQL Server will be the master, but it's still quite useful. It turns out that SQL Server ships with replication functionality that can solve this problem with relatively little pain (depending on your schema of course), providing full transactional replication. For me in this case, I wanted to use tsearch2 to search some fulltext data, because the fulltext indexer in SQL Server really isn't very good. For example, as a step in migration or to be able to use PostgreSQL features for data analysis while not having to touch existing clients working with MSSQL. There can be many reasons for wanting to replicate your data from a MS SQL Server installation to your PostgreSQL installation. But I managed to recover the text, hopefully it helps someone. Note: I'm sorry, all screenshots were lost in the planet crash.
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