In SQL 2012, if your primary drops offline or the cluster loses quorum, the readable replica databases drop offline. (This is hilarious because it’s right when you really want to be able to query the secondaries.) No way to control it – it’s totally automatic. In SQL 14, the secondaries remain online and readable when the primaries aren’t available. However, keep in mind that typical AlwaysOn AG connections sql server 2014 new features for dba go through the AG listener name, and then fetch the list of readable replicas from the primary. This just means that in order to keep your report queries online, you can’t use the AG listener – you have to connect directly to the replica’s server name. I like using a separate set of DNS records for readable replicas, like readonly.mydomainname.com, and have my report servers point at those.
- As you’d expect with SQL Server,
each new release has brought many new features over the years. - Microsoft has increased the performance of the SELECT INTO statement.
- When Microsoft introduced the columnstore index in SQL Server 2012, it provided improved performance for data warehousing queries.
- In which Phil illustrates an old trick using STUFF to intert a number of substrings from a table into a string, and explains why the technique might speed up your code…
- Some of the more exciting ones include Scalar UDF inlining, which automagically turns your scalar UDFs into something more efficient and set-based.
- The reduced latency gained from designating all or some of the transactions as delayed durable.
It gives you even faster load speed, query performance, concurrency, and even lower price per terabyte. SQL Server uses SSDs as an extension to the database buffer pool, allowing more in-memory processing and reducing disk I/O. For the Resource Gouvernor, Resource pools now support configuration of minimum and maximum IOPS per volume. Leveraging the memory-optimized TempDB metadata feature will help with your TempDB bottlenecks. ADR will help you significantly reduce your database recovery times because you no longer have to wait on that one super long-running transaction and will help control crazy transaction log growth. Need to use scalar UDFs but were afraid of the performance hit?
SQL Server AlwaysOn Improvements
In SQL Server 2014 single partitions can be rebuilt and additional partition switching and index rebuild operations can be performed while
the table is online. The Resource Governor lets you limit the amount of CPU and memory that a given workload can consume. SQL Server 2014 extends the reach of the Resource Governor to manage storage I/O usage as well. The SQL Server 2014 Resource Governor can limit the physical I/Os issued for user threads in a given resource pool. The new columnstore index gives you the possibility to update the underlying table without dropping the columnstore index like you were forced to do in previous versions. Also, the columnstore index in SQL Server 2014 has to use all columns from the table and cannot be combined with another index.
This can be defined at the database level, COMMIT level, or ATOMIC block level in
Natively Compiled Stored Procedures. Also the following Stored Procedure sys.sp_flush_log is included to flush
the Transaction Log to disk in order to make previously committed transactions
durable with delayed durability. Encountering issues when trying to shrink the log file in SQL Server can lead to bloated database files, reduced storage efficiency, and potential performance degradation.
SQL SORT BY Statement
It will be nice if this tip would have included the version that these features are supported! Let’s take a look at the new features and improvements with SQL Server 2014. PostgreSQL is a powerful and versatile open-source relational database that is used by a wide range of businesses and organizations.
Although in SQL Server 2012 this feature was available there was a restriction where the underlying table has to be read-only. The columnstore indexes were introduced by Microsoft in SQL Server 2012 in order to provide important improvements in terms of performance for data warehouse-style queries. SQL Server 2012 CU2 already lets you back up databases to Azure storage.
Columnstore Indexes
This feature is only available in Enterprise edition of SQL Server 2014 and require a 64 bit installation of SQL Server. Yet another index-related improvement, but this time on columnstore indexes,
is the introduction of ordered clustered columnstore indexes to improve performance
for queries based on ordered column predicates. It is relatively easy to create table and/or stored procedures to take advantage of the In Memory Built-in feature.
Actually I am upgrading from 2008 so hopefully there is some good changes. Grants Connect permission for users on Databases that may be created in future. Now SQL Server backup data can be encrypted during the backup creation with several
new encryption algorithms like AES 128, AES 192, AES 256 and 3DES.