Beginning Microsoft SQL Server 2008 ... - S3 Tech Training

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Appendix A: System Functions In addition, we have the OVER operator, which, while largely working as a ranking tool, can be applied to other forms of T-SQL functions (most notably aggregates). While I only discuss it as part of the ranking functions, you may see it referenced several other places in this appendix. Legacy System Functions (a.k.a. Global Variables) @@CONNECTIONS Returns the number of connections attempted since the last time your SQL Server was started. This one is the total of all connection attempts made since the last time your SQL Server was started. The key thing to remember here is that we are talking about attempts, not actual connections, and that we are talking about connections as opposed to users. Every attempt made to create a connection increments this counter regardless of whether that connection was successful or not. The only catch with this is that the connection attempt has to have made it as far as the server. If the connection failed because of NetLib differences or some other network issue, then your SQL Server wouldn’t even know that it needed to increase the count — it only counts if the server saw the connection attempt. Whether the attempt succeeded or failed does not matter. It’s also important to understand that we’re talking about connections instead of login attempts. Depending on your application, you may create several connections to your server, but you’ll probably only ask the user for information once. Indeed, even Query Analyzer does this. When you click for a new window, it automatically creates another connection based on the same login information. This, like a number of other system functions, is often better served by a system stored procedure, sp_monitor. This procedure, in one command, produces the information from the number of connections, CPU busy, through to the total number of writes by SQL Server. So, if basic information is what you’re after, then sp_monitor may be better — if you need discrete data that you can manipulate, then @@CONNECTIONS provides a nice, neat, scalar piece of data. @@CPU_BUSY 588 Returns the time in milliseconds that the CPU has been actively doing work since SQL Server was last started. This number is based on the resolution of the system timer — which can vary — and can therefore vary in accuracy. This is another of the “since the server started” kind of functions. This means that you can’t always count on the number going up as your application runs. It’s possible, based on this number, to figure out a CPU percentage that your SQL Server is taking up. Realistically though, I’d rather tap right into the Performance Monitor for that if I had some dire need for it. The bottom line is that this is one of those really cool things from a “gee, isn’t it swell to know that” point of view, but doesn’t have all that many practical uses in most applications.
@@IDLE Returns the time in milliseconds (based on the resolution of the system timer) that SQL Server has been idle since it was last started. You can think of this one as being something of the inverse of @@CPU_BUSY. Essentially, it tells you how much time your SQL Server has spent doing nothing. If anyone finds a programmatic use for this one, send me an e-mail — I’d love to hear about it (I can’t think of one). @@IO_BUSY Returns the time in milliseconds (based on the resolution of the system timer) that SQL Server has spent doing input and output operations since it was last started. This value is reset every time SQL Server is started. This one doesn’t really have any rocket science to it, and it is another one of those that I find falls into the “no real programmatic use” category. @@PACK_RECEIVED and @@PACK_SENT Respectively return the number of input packets read/written from/to the network by SQL Server since it was last started. Primarily, these are network troubleshooting tools. @@PACKET_ERRORS Returns the number of network packet errors that have occurred on connections to your SQL Server since the last time the SQL Server was started. Primarily a network troubleshooting tool. @@TIMETICKS Returns the number of microseconds per tick. This varies by machines and is another of those that falls under the category of “no real programmatic use.” @@TOTAL_ERRORS Apendix A: System Functions Returns the number of disk read/write errors encountered by the SQL Server since it was last started. Don’t confuse this with runtime errors or as having any relation to @@ERROR. This is about problems with physical I/O. This one is another of those of the “no real programmatic use” variety. The primary use here would be more along the lines of system diagnostic scripts. Generally speaking, I would use Performance Monitor for this instead. 589
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Programmer to Programmer Get more
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Beginning Microsoft SQL Ser ver® 2
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Beginning Microsoft SQL Ser ver® 2
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About the Author Experiencing his f
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Acknowledgments Over the years, the
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Contents Chapter 2:T ools of the T
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Contents xviii The CREATE Statement
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Contents xx Correlated Subqueries 1
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Contents xxii SORT_IN_TEMPDB 280 ON
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Contents xxiv Control-of-Flow State
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Contents xxvi How the SQL Ser ver L
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Contents Chapter 16: A Brief XML Pr
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Contents Chapter 19: Pla ying Admin
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Introduction The beginning user wil
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Introduction ❏ We show file names
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Introduction xxxvi ❏ Understand t
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Chapter 1: RDBMS Basics: What Makes
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Chapter 2: Tools of the Trade 22 My
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Chapter 2: Tools of the Trade ❑ S
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Chapter 2: Tools of the Trade 26 Ke
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Chapter 2: Tools of the Trade 28 Th
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Chapter 2: Tools of the Trade 30 lo
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Chapter 2: Tools of the Trade 32 3.
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Chapter 2: Tools of the Trade 34 Fi
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Chapter 2: Tools of the Trade Figur
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Chapter 2: Tools of the Trade Note
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Chapter 2: Tools of the Trade bcp i
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3 The Foundation Statements of T-SQ
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asic SELECT statement. Fire up the
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Now let’s try taking a little bit
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very few of your tables will have s
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Operator Example Usage Effect ALL,
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Chapter 3: The Foundation Statement
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WHERE SalesOrderID IN (43660, 43670
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AVG This one is for computing avera
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efore, but remove the two AS keywor
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You’ll get a result that is a bit
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What if we want to place conditions
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Let’s say, for example, that we w
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City varchar(20) NOT NULL, State ch
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for it in the INSERT statement. For
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And sure enough, we get back the on
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Chapter 4: JOINs 82 returned is in
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Chapter 4: JOINs 84 Using an INNER
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Chapter 4: JOINs 86 Uh, oh — this
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Chapter 4: JOINs How It Works Unlik
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Chapter 4: JOINs If we were to look
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Chapter 4: JOINs 92 What I’m tryi
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Chapter 4: JOINs 16 Mountain-500 Si
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Chapter 4: JOINs 96 Let’s use thi
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Chapter 4: JOINs 98 vendor. We’re
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Chapter 4: JOINs 100 Somehow, we lo
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Chapter 4: JOINs Try It Out FULL JO
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Chapter 4: JOINs Every time I teach
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Chapter 4: JOINs JOIN Sales.Special
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Chapter 4: JOINs Figure 4-1 As alwa
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Chapter 4: JOINs 110 CREATE TABLE U
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Chapter 4: JOINs There are two diff
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Chapter 5: Creating and Altering Ta
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Chapter 6: Constraints At a more sp
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Chapter 6: Constraints We can then
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Chapter 6: Constraints A table can
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Chapter 6: Constraints FOREIGN KEY
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Chapter 6: Constraints How It Works
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Chapter 6: Constraints Cascading Ac
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Chapter 6: Constraints 166 This is
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Chapter 6: Constraints 168 FROM Ord
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Chapter 6: Constraints 170 Let’s
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Chapter 6: Constraints CHECK Constr
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Chapter 6: Constraints Defining a D
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Chapter 6: Constraints Ignoring Bad
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Chapter 6: Constraints Try running
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Chapter 6: Constraints Rules and De
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Chapter 6: Constraints Dropping Rul
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Chapter 6: Constraints 184 Restrict
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7 Adding More to Our Queries When I
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Building a Nested Subquery A nested
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While this works just fine, queries
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We’ll go back to the AdventureWor
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❑ Aliases are used in both querie
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Now let’s see this at work in our
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So let’s take this now and apply
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This join-based syntax, for example
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IF NOT EXISTS (SELECT ‘True’ FR
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The conversions can actually get a
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there are no other roll up records
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GROUP BY soh.OrderDate, sod.Product
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OUTPUT $action, inserted.Year, inse
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The long-standing, traditional view
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8 Being Normal: Normalization and O
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Chapter 8: Being Normal: Normalizat
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9 SQL Ser ver Storage and Index Str
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Page Splits When a page becomes ful
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The point here is that what happens
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Page Splits — A First Look All of
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You may hear lots of bad things abo
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Navigating the Tree Figure 9-4 As I
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there was no link between the data.
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Root Non-Leaf Level Leaf Level Figu
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The CREATE INDEX Statement The CREA
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FILLFACTOR When SQL Server first cr
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works only if tempdb is on a separa
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Secondary XML Indexes Chapter 9: SQ
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occur, and that one or more non-lea
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isn’t room on the page, SQL Serve
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more administrator oriented and usu
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The Database Engine Tuning Advisor
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The output is far more self-describ
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We use a FILLFACTOR when we need to
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Chapter 9: SQL Server Storage and I
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Chapter 10: Views The preceding syn
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Chapter 10: Views 302 columns to a
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Chapter 10: Views Try It Out Using
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Chapter 10: Views 306 soh.SalesOrde
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Chapter 10: Views AW00000676 43659
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Chapter 10: Views NULL values will
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Chapter 10: Views Editing V iews wi
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Chapter 10: Views 314 There are fou
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Chapter 10: Views Editing Views in
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Chapter 10: Views 318 In addition,
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Chapter 10: Views 320 from the firs
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Chapter 10: Views You can get the y
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11 Writing Scripts and Batches Whet
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Next we have a DECLARE statement to
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I’m not going to pick any bones a
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Using @@IDENTITY @@IDENTITY is one
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How It Works What we’re doing in
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DECLARE @RowCount int; --Notice the
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When the editing tool encounters a
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When you think about it, this seems
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So, let’s try a quick query direc
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We now have our text file source fo
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Let’s build an example in the Adv
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DECLARE @InVar varchar(50); DECLARE
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-- This won’t work DECLARE @Numbe
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-- Now we’re run our conditional
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Out of the condition from inner con
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A Simple CASE A simple CASE takes a
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3 8 More Than One Apart 2 2 Ends Wi
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Now, I don’t know about you, but
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The WAITFOR statement does exactly
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IF @ErrorNo = 2714 -- Object exists
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Chapter 11: Writing Scripts and Bat
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Chapter 12: Stored Procedures Creat
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Chapter 12: Stored Procedures Dropp
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Chapter 12: Stored Procedures Suppl
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Chapter 12: Stored Procedures 374 [
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Chapter 12: Stored Procedures Confi
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Chapter 12: Stored Procedures Now,
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Chapter 12: Stored Procedures SQL S
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Chapter 12: Stored Procedures 382 c
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Chapter 12: Stored Procedures It wo
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Chapter 12: Stored Procedures 388 -
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Chapter 12: Stored Procedures Note
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Chapter 12: Stored Procedures 392 n
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Chapter 12: Stored Procedures All t
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Chapter 12: Stored Procedures Sproc
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Chapter 12: Stored Procedures When
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Chapter 12: Stored Procedures 400 @
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Chapter 12: Stored Procedures I’d
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Chapter 12: Stored Procedures match
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Chapter 12: Stored Procedures There
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13 User-Defined Functions Well, her
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types!), except for BLOBs, cursors,
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We get back the same set as with th
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AS RETURN (SELECT BusinessEntityID,
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in your relational database. These
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AS BEGIN ( EmployeeID int NOT NULL,
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So, as you can see, we can actually
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Despite being schema-bound, this on
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14 Transactions and Locks This is o
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we are unable or do not want to com
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Figure 14-1 Data needed Data in cac
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Transaction 4 This transaction wasn
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Oops — problem!!! Transaction 2 h
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The only cure for this is setting y
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Exclusive Locks Exclusive locks are
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Also: ❑ The Sch-S is compatible w
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The syntax for switching between th
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As with most things in life, howeve
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purchased. Process 2 records sales;
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Chapter 14: Transactions and Locks
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Chapter 15: Triggers the world’s
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Chapter 15: Triggers WITH ENCRYPTIO
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Chapter 15: Triggers FOR|AFTER The
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Chapter 15: Triggers 458 To illustr
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Chapter 15: Triggers 460 IF EXISTS
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Chapter 15: Triggers ❑ Feeding de
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Chapter 15: Triggers Trigger Firing
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Chapter 15: Triggers Like regular t
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Chapter 15: Triggers The COLUMNS_UP
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Chapter 15: Triggers This is the sa
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Chapter 15: Triggers 472 we have th
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Chapter 16: A Brief XML Primer So,
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Chapter 16: A Brief XML Primer Figu
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Chapter 16: A Brief XML Primer Elem
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Chapter 16: A Brief XML Primer ❑
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Chapter 16: A Brief XML Primer 482
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Chapter 16: A Brief XML Primer Name
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Chapter 16: A Brief XML Primer The
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Chapter 16: A Brief XML Primer 2. W
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Chapter 16: A Brief XML Primer SQL
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Chapter 16: A Brief XML Primer So,
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Chapter 16: A Brief XML Primer If,
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Chapter 16: A Brief XML Primer Note
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Chapter 16: A Brief XML Primer RAW
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Chapter 16: A Brief XML Primer AUTO
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Chapter 16: A Brief XML Primer EXPL
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Chapter 17: Reporting for Duty, Sir
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Appendix A: System Functions UNICOD
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Appendix A: System Functions CAST a
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Appendix A: System Functions HOST_I
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Appendix A: System Functions NULLIF
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Appendix A: System Functions Text a
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Appendix B: Very Simple Connectivit
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ABS function A ABS function, 611 AC
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closing tags closing tags, XML docu
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cryptographic functions (continued)
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defects defects. See well formed XM
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EXPLICIT option EXPLICIT option bas
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IGNORE_DUP_KEY option (CREATE INDEX
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LOWER function LOWER function, 635
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online transaction-processing (OLTP
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query results query results alphabe
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scripts (continued) creating with M
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state state, basics of, 391 stateme
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transactions (continued) COMMIT TRA
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View Builder View Builder (Manageme
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