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Test Code : 70-761
Test designation : Querying Data with Transact-SQL
Vendor designation : Microsoft
real questions : 130 true Questions

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Querying Data with Transact-SQL book

statistics Compression in SQL Server 2012 | 70-761 true Questions and VCE practice Test

This chapter is from the e-book 

With information explosion happening in the trade and commercial enterprise, more and more information is being kept within SQL Server. although, the databases are not any longer averaging 100GB in measurement as they fill been 10 years in the past. Now databases are becoming larger than ever, with sizes from 10 to 50TB now being usual. moreover, it's commonly most efficacious a pick few tables inside the database that are becoming to these record-breaking sizes. To combat this, even though storage is getting more affordable, Microsoft has brought data compression and equipment, particularly the facts Compression Wizard and selected Transact-SQL statements, to facilitate facts compression. for this reason, a DBA can compress tables and indexes to conserve space for storing at a mild CPU can charge. one of the crucial leading design dreams of information compression became to shrink records warehouse reality tables. fact tables are typically the greatest tables within a data warehouse as a result of they comprise the vast majority of the statistics associated with a database.

SQL Server provides two methods, web page and Row compression, to in the reduction of data storage on disk and hasten I/O performance with the aid of decreasing the volume of I/O required for transaction processing. web page and row compression toil in distinct, yet complementary, ways and are worth further dialogue.

page compression uses an algorithm called “deduplication.” When deduplicating, as the designation implies, SQL Server looks for reproduction values that loom again and again in the records web page. as an instance, the table HumanResources.worker within the AdventureWorks2012 database carries an nvarchar(50) column referred to as JobTitle. This column incorporates many reproduction values—things relish “Design Engineer” and analysis and construction supervisor.” These values may look time and again on a sole statistics page. the usage of web page compression, SQL Server can remove such reproduction values within a data page with the aid of changing each reproduction cost with a tiny pointer to a sole leer of the full value. (by the way, here is called “dictionary-based mostly compression.”)

through comparison, row compression doesn't definitely utilize a compression algorithm per se. in its place, when row compression is enabled, SQL Server with ease gets rid of any added, unused bytes in a difficult and likeaflash statistics ilk column, corresponding to a CHAR(50) column.

page and row compression are not suitable, however with the aid of enabling web page compression SQL Server instantly includes row compression. that you may besides specify compression per partition, so partitioned tables may fill numerous compression specifications at once.

the utilize of the records Compression Wizard to Compress house

The facts Compression Wizard can besides be used to investigate and compress house associated with a desk saved in a bank or clustered index structure. additionally, it might probably besides befriend compression tables the utilize of nonclustered index and index views. eventually, if the desk is partitioned, a DBA can compress portions of the tables, and quite a few partitions would not fill to reserve the very compressed settings.

The facts Compression Wizard can besides be invoked through correct-clicking any table or index and opting for Storage and then maneuver Compression. the 1st step is to select the compression ilk in keeping with a partition quantity, or you can settle to utilize the identical compression for barnone partitions. The compression alternatives encompass Row, page, or None, indicating no compression.

The subsequent step is to click on the compute button to overview the disk can freight savings. The cost discount rates should be displayed in the Requested Compressed space column in line with a partition number. here's displayed in determine three.14. The ultimate step includes identifying an output choice. it is workable to create a script, Run instantly, or schedule the project to commence at a later time.

Figure 3.14.

determine three.14. Specifying the compression classification with the statistics Compression Wizard.

facts Compression with Transact SQL

For these of you who don't relish the usage of a GUI, the following examples outline the default syntax for compressing data with Transact-SQL.

creating a desk with Row Compression Enabled CREATE table <table name> (<Column 1. int, <Column 2> nvarchar(50) ) WITH (DATA_COMPRESSION = ROW); GO making a desk with web page Compression Enabled CREATE table <desk name> (<Column 1. int, <Column 2> nvarchar(50) ) WITH (DATA_COMPRESSION = web page); GO

the following Transact-SQL syntax illustrates compressing the earnings Order detail desk in the AdventureWorks2012 database via the page compression environment:

USE [AdventureWorks2012] ALTER desk [Sales].[SalesOrderDetail] REBUILD PARTITION = ALL WITH (DATA_COMPRESSION = page )

you could monitor compression undertaking with the efficiency counters page Compression makes an attempt/sec and web page Compressed/sec create in the SQL Server entry strategies Object. for example, this Transact-SQL code will question each counters:

opt for cntr_value FROM sys.dm_os_performance_counters where counter_name relish 'page Compression%'

As mentioned prior, compression is protected simplest in the enterprise version of SQL Server. Compression technologies dramatically chop I/O requests and storage; youngsters, the storage gained is usually on the cost of introduced CPU exercise. for this reason, it's strongly recommended that you just check earlier than imposing statistics compression in a construction workload scenario. In most transaction processing scenarios, SQL Server has CPU to spare and sorely wants greater I/O throughput. youngsters, on occasion the growth to I/O performance is not gigantic enough to warrant the lost CPU. leer at various to accomplish unavoidable that performance isn't negatively impacted.

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