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Does Composite have a primary key?
A composite key specifies multiple columns for a primary-key or foreign-key constraint. The next example creates two tables. The first table has a composite key that acts as a primary key, and the second table has a composite key that acts as a foreign key.
Can a composite primary key have null value?
In composite primary key columns you cannot pass null values. Each column defined as a primary key would be validated so that null values are not passed on to them. If you have given a Unique constraint then we have a chance of NULL values being accepted. But in case of primary keys they cannot hold null values.
Do you need primary keys for transaction replication?
Let’s create a sample database to demonstrate the Primary Keys requirement for the transactional replication. The database will have one table with a primary key and tree tables without (one without indexes, one with clustered index, and one with unique nonclustered index):
How to troubleshoot SQL Server transactional replication performance?
Troubleshoot the data issues by using agent logging to external files. If there is blocking issue, then apply the blocked process trace definition. Use the Row Filters if the replication setup not able to handle the full dataset. Check the number of virtual log files, they can also be the cause of delay.
When does transactional replication go out of sync?
Recently, I encountered a case where the Transactional Replication between our Production OLTP server named XYZ and Reporting database server named PQR went out of sync. Both the servers were located in the same Data Centre in the USA.
Which is the default Default in transactional replication?
Because the original transaction is applied in smaller units, the Subscriber can access rows of a large logical Publisher transaction prior to the end of the original transaction, breaking strict transactional atomicity. The default is 0, which preserves the transaction boundaries of the Publisher.