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Tracks when a transaction has requested a lock on a resource already locked by another transaction, resulting in a deadlock. Indicates that a finer-grained lock has been converted to a coarser-grained lock. Locking at a smaller granularity, such as rows, increases concurrency but has a higher overhead because more locks must be held if many rows are locked. Locking at a larger granularity, such as tables, decreases concurrency because locking an entire table restricts access to any part of the table by other transactions. Tracks when a lock is released.

10

-- Connection 3 /* Leave the above line to easily see that this query window belongs to Connection 3. */ USE TestDB;

User Database (unrecovered)

The primary database is accessible to applications and accepts transactions. Transac tion log backups are taken on a periodic basis and copied to the server hosting the secondary database.

5. In Connection 2, execute the following SQL statements to start a transaction, and acquire an exclusive lock on one row in the test table.

2

The secondary database, also referred to as the standby, is normally inaccessible, and transaction log backups from the primary database are restored on a continuous basis. The secondary database can be in one of two modes: Standby Mode or No Recovery Mode. When the secondary database is in Standby Mode, users can connect to and issue selects against the database. When the secondary database is in No Recovery Mode, users cannot connect to the database. In either mode, transaction logs can be restored to the secondary database. Transaction logs cannot be restored when users are connected to the database, so you should not use Standby Mode for high availability architectures.

-- Connection 2 BEGIN TRAN; UPDATE Test.TestTable SET Col2 = Col2 + 1 WHERE Col1 = 1;

The monitor server, which is optional within a log shipping architecture, contains a set of jobs that send alerts when the log shipping session is perceived to be out of sync.

Log shipping operates between databases, so a primary server and a secondary server do not actually exist. It is entirely possible to log ship one database from ServerA to ServerB and then log ship a different database from ServerB back to ServerA. When we refer to a primary or primary server, we are specifically referring to the SQL Server instance that contains the primary database within a particular log shipping session. When we refer to a secondary or secondary server, we are specifically referring to the SQL Server instance that contains the secondary database within a par ticular log shipping session. When we refer to a standby or standby server, we are specifically refer ring to the SQL Server instance that contains the secondary database within a particular log shipping session. For brevity, we use the terms primary and secondary/standby throughout the remainder of this chapter. Please keep in mind that these terms refer to a particular database, and any other object referenced for either a primary database or a secondary database applies to the instance that is hosting the specific database.

6. In Connection 1, execute the following transaction to try to read the row that has been updated (but not committed) by Connection 2.

Lock:Timeout (timeout > 0)

1. What are the two modes that a standby server can be in 2. What are the three components of log shipping and what are their purposes

-- Connection 1 SET TRANSACTION ISOLATION LEVEL READ COMMITTED; BEGIN TRAN; SELECT * FROM Test.TestTable WHERE Col1 = 1;

1. Standby Mode and No Recovery Mode. 2. The primary database is accessible and accepts transactions. The second ary database has a continuous chain of transaction logs applied to keep it up to date with the primary. The monitor instance sends alerts when the log shipping session is out of sync.

You can accomplish log shipping either by using the components built into SQL Server or by custom coding all the logic. Both methods are used extensively within the industry. The built-in log shipping components consist of a set of stored procedures and tables. The stored procedures are used to configure the jobs that do all the work in a log ship ping architecture as well as maintain the entries in the log shipping tables. The log shipping tables are simply a repository of data that tracks the configuration and oper ational state of the log shipping environment.