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Updating a nonexistent row and inserting a duplicate primary key would both cause errors in the transactional engine and cause the Distribution Agent to shut down. Transactional replication in either a bidirectional configuration or a peer-to-peer con figuration can be leveraged for high availability. You need to ensure that no conflicts are enabled by doing the following:

Restrict applications to writing to only a single partner. Partition the writes among the publishers within the application because each database should still contain a full copy of all of the data.

A heap is a table without a clustered index. Heaps have one row in sys.partitions, with index_id = 0 for each partition used by the heap. By default, a heap has a single partition. When a heap has multiple partitions, each partition has a heap structure that contains the data for that specific partition. Depending on the data types in the heap, each heap structure will have one or more allocation units to store and manage the data for a specific partition. At a minimum, each heap will have one IN_ROW_DATA allocation unit per partition. The heap will also have one LOB_DATA allocation unit per partition, if it contains large object (LOB) columns. It will also have one ROW_OVERFLOW_DATA allocation unit per partition, if it contains variable-length columns that exceed the 8,060-byte row size limit. The column first_iam_page in the sys.system_internals_allocation_units system view points to the first Index Allocation Map (IAM) page in the chain of IAM pages that manage the space allocated to the heap in a specific partition. SQL Server 2005 uses the IAM pages to move through the heap. The data pages and the rows within them are not in any specific order and are not linked. The only logical connection between data pages is the information recorded in the IAM pages. Table scans or serial reads of a heap can be performed by scanning the IAM pages to find the extents that are holding pages for the heap. Because the IAM represents extents in the same order that they exist in the data files, this means that serial heap scans progress sequentially through each file. Using the IAM pages to set the scan sequence also means that rows from the heap are not typically returned in the order in which they were inserted.

By providing the appropriate restrictions, transactional replication in either a bidirec tional or peer-to-peer configuration will react the same way as transactional replica tion with queued updating subscribers or merge replication with respect to failovers and failbacks.

Exam Tip When Microsoft exams discuss RAID, they almost always do so in the context of software rather than hardware RAID. Software RAID is managed by Windows; hardware RAID is managed by a hardware device such as a RAID adapter. From a Windows perspective, a configured hardware RAID device appears as a single disk. If a disk in a hardware RAID array fails, you deal with it at the hardware level rather than by using the Computer Management console. Depending on the hardware RAID, the product might ship with its own drivers and software. Generally, you do not troubleshoot and restore hardware RAID devices using the Disk Management console, though you might use that console to work with volumes hosted on hardware RAID disks.

When employing regular transactional replication, the failback to the publisher is a multistep process because changes are expected to be sent from publisher to sub scriber. To fail back, all the changes made to the subscriber must be moved back to the publisher. Reinitialization can be accomplished in two different ways: