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With mixed authentication mode (technically known as SQL Server and Windows authentication mode), users connect to SQL Server through SQL Server logins or Windows accounts. If a user attempting to connect has a valid SQL Server login, the connection is accepted. If a user does not have a valid SQL Server login, SQL Server verifies the user s Windows account information. If the Windows account has suffi cient permissions to connect to SQL Server, the connection is then accepted.

In the repeatable read isolation level, SQL Server not only guarantees that dirty reads do not happen in your transaction, but it also guarantees that if you issue two DML statements against the same table with the same WHERE clause (one query could be a select and the next could be an update), both queries will return the same results. This is not entirely true because the latter queries might return more rows than the first query. A repeatable read protects against deletes and updates of accessed rows, but not against inserts that match the specific WHERE clause, which is the phantom rows concurrency problem. Note that phantom rows might also occur if you use aggregate functions, although it is not as easy to detect. The first query might, for example, include the sum over four rows, while the second query includes the sum over five rows. One important thing to note is that, because the repeatable read isolation level is achieved using blocking of the other transaction, the use of this isolation level greatly increases the number of locks held for the duration of the transaction. This, in turn, can cause serious perfomance problems due to blocked transactions. It also greatly increases the risk for deadlocks. A deadlock is encountered if different connections are waiting for locks held by each other. In the repeatable read isolation level, shared locks are acquired for read operations and are also held for the duration of the transaction, not allowing changes to the data by other transactions. The following example shows the behavior of the repeatable read isolation level:

Object Explorer User or Role Properties (Securables Page) You can use the Securables page in either the User or Role Properties dialog box to view or set explicit permissions on database securables for a user, database role, or application role. This page shows only permissions that are explicitly granted or denied to a user or role. The principal may inherit additional permissions through membership in a group or role. The sum of all the explicit and inherited (implicit) permissions of the principal

One advantage of SQL Server authentication (as opposed to Windows authentica tion) is that SQL Server authentication does not depend on any external servers to function. However, when you use choose Windows authentication for SQL Server in an Active Directory domain, a domain controller must be available to complete user authentication. If a domain controller is not available, the logon attempt fails. There

ALTER DATABASE <current_database> SET ALLOW_SNAPSHOT_ISOLATION OFF; ALTER DATABASE <current_database> SET READ_COMMITTED_SNAPSHOT OFF; -- Table including some example rows used in this example. CREATE TABLE Test.TestTran (Col1 INT NOT NULL, Col2 INT NOT NULL); INSERT Test.TestTran (Col1, Col2) VALUES (1, 1); INSERT Test.TestTran (Col1, Col2) VALUES (1, 2);

fore, when you configure SQL Server with Windows authentication in an Active Direc tory domain, you need to configure the domain controllers to have high availability.

Typically, when you deploy SQL Server, you are doing so in a network environment that has a preexisting security infrastructure: a Windows domain. As a result, you need to know how to integrate SQL Server into this infrastructure, not only to lever age this security in place but also to understand what adjustments you might need to make to Active Directory security on the server itself.

SET TRANSACTION ISOLATION LEVEL REPEATABLE READ; BEGIN TRAN; SELECT * FROM Test.TestTran WHERE Col1 = 1; /* Returns 2 rows. */

constitutes its effective permissions. From this page, you can access the following items: