SQL Server 2012 virtually out, Microsoft talks features, licensing
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1 SQL Server 2012 virtually out, Microsoft talks features, licensing If you had to pick one or two features that are most important in SQL Server 2012, what are they and why? Mark Kromer: If I had to pick just two, then I would go with my two personal favorites: AlwaysOn and column-store indexes. AlwaysOn availability groups (AGs) are important because they solve several specific issues customers raised when implementing database mirroring. AGs now include multiple secondary servers, so there is no need for a witness server, readable secondaries or multiple databases within a mirrored group. Column-store indexes can dramatically improve query performance for data warehouse workloads and make a big difference in data warehousing and business intelligence. SQL Server 2012 has core-based licensing, as compared with processor-based licensing in SQL Server 2008 R2. Why is this change good for IT shops migrating to SQL Server 2012? Kromer: The way Microsoft has implemented core-based licensing is very beneficial to IT shops because the price of an Enterprise Edition license does not increase unless your server has processors with more than four cores. Because the price of a SQL Server core license is essentially today's processor license divided by four, this means that there is no price increase for core-based licenses on a server with four-core or fewer processors. Can you explain how AlwaysOn and its availability groups will improve high availability in SQL Server 2012? Kromer: AlwaysOn is a marketing term that encompasses all of the SQL Server highavailability features but mostly focuses on advances made to clustering and the new availability groups feature. AGs provide database mirroring-like functionality with synchronous and asynchronous options but allow multiple secondaries that can be read-only as well as allowing multiple databases included in that availability group. This allows you to offload reporting and database backups to a secondary server. Automatic failover is provided to a synchronous secondary server and uses a virtual host name capability via "listeners" that leverage the Windows Cluster Server API [application programming interface] instead of the existing SQL Server database mirroring secondary server ODBC [open database connectivity] clause. This means that AGs provide high availability, disaster recovery -- you can use asynchronous transactions to a remote site secondary server -- and performance gains by offloading backups and reporting to a secondary. Although AGs use Cluster Server, you do not need to configure complex cluster configurations. AGs only require that you install SQL Server as a typical SQL Server instance, as opposed to a failover cluster instance, and make sure that each node joins the cluster. SQL Server will do the remaining work, such as creating the necessary services and virtual names. This also eliminates the need for a witness server.
2 Using The AlwaysOn Feature of SQL Server 2012 This is the first in a four-part series on the new AlwaysOn feature in SQL Server In this article, AlwaysOn is introduced and contrasted with previous highavailability solutions in SQL Server. The second part of the series will commence with a detailed walkthrough on preparing the environment for AlwaysOn. Prior to SQL Server 2012, SQL Server had several high availability and disaster recovery solutions for an enterprise s mission critical databases such as failover clustering, database mirroring, log shipping or combinations of these. Each solution typically has a major limitation, in the case of failover clustering for example, its configuration is very tedious and complex and you arguably have single shared storage or single point of failure. Database mirroring is relatively easy to configure in comparison with failover clustering, but you can have only one database in a single mirroring setup and you cannot read from the mirrored database. Log shipping does not provide automatic failover (higher availability) though it be used for disaster recovery with some expected data loss. SQL Server 2012 (Code name SQL Server Denali) introduces a new feature called AlwaysOn which combines the best of failover clustering and database mirroring and overcomes major of the limitations imposed in failover clustering or a database mirroring setup. Please note, in this article instance, server, replica and node refer to same thing and will be used interchangeably. Understanding The AlwaysOn Feature AlwaysOn is a new High Availability (HA) and Disaster Recovery (DR) solution in SQL Server 2012 which improves high availability and protects data of your mission critical applications. AlwaysOn lets you utilize your current hardware and provides a flexible and simplified configuration, deployment and management experience. AlwaysOn is common name for two high availability and disaster recovery solutions: AlwaysOn Failover Cluster Instance (FCI) This is an enhancement to the existing SQL Server failover clustering (which is based on Windows Server Failover Cluster (WSFC)) which provides higher availability of SQL Server instance after failover. Some of the enhancements in AlwaysOn Failover Cluster Instance over the existing SQL Server failover clustering are: For improved site protection you can now set up multisite failover clustering You can now define flexible failover policy to better control instance failover You now have better and improved diagnostics capabilities out of the box AlwaysOn Availability Group (AG) This is a completely new HA/DR feature and combines best of failover clustering and database mirroring. It allows you to create a group of databases which failover together as a
3 unit from one replica/instance of SQL Server to another replica/instance of SQL Server in the same availability group. Each availability group that we create, allows you to create one (and only) availability group listener which is nothing but a Virtual Network Name (VNN) to be used by clients to connect to the availability group. The AlwaysOn availability group is based on Windows Server Failover Cluster (WSFC) and hence you need to install the failover clustering feature on each server/replica and create a failover cluster adding all these server/replicas before you can start enabling/creating the availability group. You can have numerous availability groups on a single instance but a database from that instance can only be part of one availability group thus you cannot also create a database mirroring session for databases already participating in an availability group. Availability Groups Compared To Traditional SQL Server Failover Clustering In a typical SQL Server failover cluster (at the instance level), you will have two nodes/instances (Active-Passive or Active-Active) connected to shared storage drives. Though SQL Server failover clustering has been good and is used in many deployments for higher availability and disaster recovery, it has several limitations and pain points, such as: The process of setting up SQL Server failover clustering is tedious and complex there are some steps that you have to perform missing any of those steps can result in hours of additional work. This is why setting up SQL Server failover clustering is only recommended to be performed by highly experienced professionals. Both the nodes are connected to a shared storage drive; though these drives might have their own failover mechanisms we still can have a single point of failure. One of the nodes is idle all the time in case of Active-Passive cluster (recommended) and hence resources are underutilized. Though you have an Active-Active failover cluster this is not recommended as after failover one node will have double the load from both the cluster setup/applications. The infrastructure and configuration of each node should be exactly same as other nodes and mimic each other. You cannot distribute or load balance your read-write load from read only load on multiple nodes. An AlwaysOn availability group is superior to SQL Server failover clustering because the configuration, deployment and management is relatively simple and all the nodes/replicas will a copy of the databases and hence there is no shared storage or a single point of failure. You can have readable secondary and hence you can route your read-only load to a secondary replica and the read-write load to primary replica and hence have better utilization of your hardware resources. How Availability Group differs from database mirroring Database mirroring (at database level) can be set up in either synchronous mode or asynchronous mode but not both in a single mirroring setup.
4 1. Synchronous Commit mode (high-safety) : The transaction logs are hardened at both the principal server as well as at the mirror server before commit acknowledgement is returned to the client; it may introduce some latency but ensures no data loss after failover. In this mode you can also set automatic failover and for that you need another instance which will work as a witness and peforms the job of role switching. 2. Asynchronous Commit mode (high performance) : The principal server hardens the transaction log at the principal server and returns the commit acknowledgement to client without waiting for transaction log hardening acknowledgement to be received from the mirror server. Transaction log hardening at the mirror server happens in a asynchronous manner. These all sound good solutions but like SQL Server failover clustering, it has also several limitations: 1. You can have only one database in a single mirroring session/setup, though you can define multiple mirroring sessions/setups (one for each database) but it is not possible to have a group of databases failover together. 2. Databases on mirror server are always in recovery mode and hence you cannot read from a mirrored database (though you can create a database snapshot and read from it but but would only reflect data till the particular point in time when it was created). 3. You cannot load balance your read-write requests on one server and read-only on another server. 4. You can have only one mirror server; you cannot have one for higher availability (synchronous commit mode) and one for disaster recovery (asynchronous commit mode) in one single mirroring session, although you can combine it with log shipping for disaster recovery. An AlwaysOn availability group is recommended over database mirroring as this overcomes several limitations imposed in database mirroring, for example with an AlwaysOn availability group: 1. You can have multiple mirrored instance/nodes/replicas (up to four secondaries apart from one primary replica) with a combination of synchronous commit mode and asynchronous commit mode both at the same time. The replica set up in synchronous commit mode can be used for higher availability (or for automatic failover) and the replica set up in asynchronous commit mode can be used for disaster recovery. 2. You can combine two or more database together and failover them as a unit, you don t need to do it for each database separately as you were doing in case of database mirroring. 3. You can offload the read-only load from the primary replica to the secondary by configuring the secondary as readable. In this way you can have better utilization of secondary replica s hardware resources. 4. You can also offload backup operations from the primary replica to the secondary replica and hence have less workload/io on the primary replica and better utilization of the secondary replica s hardware. Preparing the Environments for an AlwaysOn Availability Group An AlwaysOn availability group is based on a Windows Server Failover Cluster (Windows Server 2008 and later versions) and hence before you can start creating an AlwaysOn Availability Group you need to first setup/install failover clustering on each node/replica and
5 then create a failover cluster with all the nodes/replicas joined to it. These are steps that you need to perform: 1. Install SQL Server 2012 on each node/replica/server 2. Install the failover clustering feature on each node/replica/server 3. Create a failover cluster and let all nodes/replicas/servers join to the cluster Each AlwaysOn availability group can have one primary replica/node/server and up to four secondary replicas. Out of these four, two of them can be set to have synchronous commit mode and one of it can have setting for automatic failover.
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