Contents
Why do I have to change a column on a replicated table?
There are many reasons this might be the case eg possibly the datatype has been incorrectly chosen, or a default is missing, or we want to rename a column. Attempting to change the table schema directly will result in the error “Cannot alter/drop the table ‘tablename’ because it is being published for replication”.
Can you change indexed views that are replicated as tables?
You cannot alter indexed views that are replicated as tables. Indexed views that are replicated as indexed views can be altered, but altering them will cause them to become regular views, rather than indexed views.
When to create a snapshot of a replicated table?
Usually, when you add a new article to an existing publication in transactional replication, running the snapshot agent will create a snapshot of just the new article. In our case, it’ll also create a snapshot of the ‘tEmployees’ table. So, to avoid all the issues and complications mentioned above,
When does alter table cannot have a collation change?
ALTER COLUMN can’t have a collation change if one or more of the following conditions exist: If a CHECK constraint, FOREIGN KEY constraint, or computed columns reference the column changed. If any index, statistics, or full-text index are created on the column. If a schema-bound view or function references the column.
Who is the subscriber in transactional replication?
The Publisher or Subscriber is a non- SQL Server database, such as Oracle. By default, Subscribers to transactional publications should be treated as read-only, because changes are not propagated back to the Publisher. However, transactional replication does offer options that allow updates at the Subscriber.
How does merge replication differ from transactional replication?
For merge replication, details of the rows updated are kept in MSmerge_contents, and if a particular row has been changed once or a hundred times, there will still only be one entry in this system table, while in transactional replication, 100 updates to a row is propagated as 100 subscriber updates.
When to use queued updating in transactional replication?
Ultimately, all Subscribers will achieve the same values as the Publisher. If immediate updating or queued updating options are used with transactional replication, updates can be made at the Subscriber, and with queued updating, conflicts might occur. The following illustration shows the principal components of transactional replication.
How are changes propagated in SQL server replication?
The three procedures that replication creates by default for each table article are: sp_MSins_< tablename >, which handles inserts. sp_MSupd_< tablename >, which handles updates. sp_MSdel_< tablename >, which handles deletes.
How does transactional replication propagate to the subscriber?
By default, transactional replication propagates changes to Subscribers through a set of stored procedures that are installed on each Subscriber. When an insert, update or delete occurs on a table at the Publisher, the operation is translated into a call to a stored procedure at the Subscriber.
How are schema changes propagated in SQL Server?
Transactional Replication Schema changes are propagated to Subscribers running previous versions of SQL Server, but the DDL statement should only include syntax supported by the version at the Subscriber. If the Subscriber republishes data, the only supported schema changes are adding and dropping a column.
Can you rename table because it is published for replication?
“cannot rename the table because it is published for replication”. But this table is not among the published articles. I’m suspecting it’s flagged somewhere as published, because it’s possible that someone added it before to publication, and dropped it but it was not unflagged in SQL Server.
Can a subscription be dropped in Merge Replication?
In merge replication, there is no possibility of dropping the subscription on a per article basis using the script above, as there is in transactional and snapshot replication. If we drop the subscription entirely including all other articles (sp_dropmergesubscription), then try to run sp_dropmergearticle there will be an error if the snapshot has
How to replicate schema changes on publication databases?
To replicate schema changes, the compatibility level of the publication must be at least 90RTM. If Subscribers are running previous versions of SQL Server or the compatibility level is less than 90RTM you can use sp_repladdcolumn (Transact-SQL) and sp_repldropcolumn (Transact-SQL) to add and drop columns. However, these procedures are deprecated.
Is it possible to change the schema of a table?
Attempting to change the table schema directly will result in the error “Cannot alter/drop the table ‘tablename’ because it is being published for replication”. So, how to change an existing column without breaking replication?
When does a schema change fail in transactional replication?
You cannot drop published objects, therefore the schema change fails. For transactional replication and merge replication, schema changes are propagated incrementally when the Distribution Agent or Merge Agent runs.