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After this lesson, you will be able to:

If possible, avoid spanning volumes across disks. The failure of one disk means that you lose all data within the spanned volume. Volumes spanned across multiple disks have a greater chance of failure than volumes located on a single disk. Many administrators make the mistake of extending a volume across disks as a way of dealing with a lack of space on an existing volume. Although this solves the problem of a lack of space on an existing volume, you should use this approach only as a stopgap measure until you can find a better solution.

The change-tracking process in merge replication is as follows: 1. The application issues a transaction. 2. The trigger behind the table is fired. 3. Insert or update is logged into MSmerge_contents while a delete is logged to MSmerge_tombstone. 4. The trigger commits. 5. The transaction commits. Unlike transactional replication, merge does not move copies of data into a distribution database. The logging that occurs within MSmerge_contents and MSmerge_tombstone indicates only that a change was made to a specific row. The actual data involved in the change is not copied; it resides only in the table. This creates an interesting effect. If 10 separate transactions were issued to the same row between cycles of the replica tion engine, and the table were configured with transactional replication, all 10 trans actions would be moved to the distribution database by the Log Reader Agent and then all 10 would subsequently be applied to the subscriber. The net effect is that nine transactions would be applied, only to be replaced by the tenth transaction against

UPDATE Test.Accounts SET Balance = Balance - 500 WHERE AccountNumber = 1001; /* Empties the account, again. That is, the account is now at -500 instead of 0. */ COMMIT TRAN; DROP TABLE Test.Accounts;

11

scriber. This is accomplished by using the following process to synchronize changes:

In this case, it is possible to withdraw more money from the account than what was available because the shared lock issued by the SELECT statement is not held for the duration of the transaction. This enables the update in Connection 2 to withdraw money from the account even though the transaction in Connection 1 has not yet completed. To solve this problem, you can change the transaction isolation level to repeatable read, which will cause Connection 1 to keep its lock on the row for the entire transaction, as follows:

3

1. The merge engine connects to the subscriber. 2. The merge engine connects to the publisher. 3. The merge engine interrogates the MSmerge_genhistory table on the subscriber to determine the list of generations that are not present on the publisher. 4. The merge engine then pulls the list of tables and rows contained in MSmerge_contents and MSmerge_tombstone for the generations that the pub lisher does not have. 5. The merge engine constructs delete statements from the rows extracted from MSmerge_tombstone. 6. The merge engine extracts the contents of the rows from the base tables in the database and packages the changes into batches. 7. The changes packaged are applied to the publisher. 8. Generations submitted to the publisher are logged into MSmerge_contents. 9. Conflicts are detected and resolved. 10. The merge engine interrogates the MSmerge_genhistory table on the publisher to determine the list of generations that are not present on the subscriber. 11. The merge engine then pulls the list of tables and rows contained in MSmerge_contents and MSmerge_tombstone for the generations that the sub scriber does not have. 12. The merge engine constructs delete statements from the rows extracted from MSmerge_tombstone. 13. The merge engine extracts the contents of the rows from the base tables in the database and packages the changes into batches. 14. The changes packaged are applied to the subscriber. 15. Generations submitted to the subscriber are logged into MSmerge_contents. A basic diagram of merge replication with the synchronization process is shown in Figure 11-9.

CREATE TABLE Test.Accounts ( AccountNumber INT PRIMARY KEY ,Balance DECIMAL(19,5) NOT NULL ); INSERT Test.Accounts (AccountNumber, Balance) VALUES (1001, 500);