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

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Chapter 19: Playing Administrator Schedule With all this setup, wouldn’t it be nice to set up a job to run this backup on a regular basis? Well, the Script button up at the top of the dialog box provides a means to do just that. Click it, and you’ll get a list of options. Choose “Script Action to Job…” and it will bring up the Job Schedule dialog box we saw earlier in the chapter, but with the job steps already completed. You can then define a regular schedule to run the backup you just defined by selecting the Schedules tab and filling it out as you desire. Recovery Models 578 Note that there are several more options for backups that are only addressable via issuing actual T-SQL commands or using the .NET programmability object model SMO. These are fairly advanced use, and further coverage of them can be found in Profession SQL Server 2008 Programming. Well, I spent most of the last section promising that we would discuss them, so it’s time to ask: What is a recovery model? Well, back in our chapter on transactions (see Chapter 14), we talked about the transaction log. In addition to keeping track of transactions to deal with transaction rollback and atomicity of data, transaction logs are also critical to being able to recover data right up to the point of system failure. Imagine for a moment that you're running a bank. Let's say you've been taking deposits and withdrawals for the last six hours — the time since your last full backup was done. Now, if your system went down, I’m guessing you’re not going to like the idea of going to last night’s backup and losing track of all the money that went out the door or came in during the interim. See where I’m going here? You really need every moment’s worth of data. Keeping the transaction log around gives us the ability to “roll forward” any transactions that happened since the last full or differential backup was done. Assuming both the data backup and the transaction logs are available, you should be able to recover right up to the point of failure. The recovery model determines for how long and what type of log records are kept; there are three options: ❑ Full: This is what it says; everything is logged. Under this model, you should have no data loss in the event of system failure assuming you had a backup of the data available and have all transaction logs since that backup. If you are missing a log or have one that is damaged, then you’ll be able to recover all data up through the last intact log you have available. Keep in mind, however, that as keeping everything suggests, this can take up a fair amount of space in a system that receives a lot of changes or new data. ❑ Bulk-Logged: This is like “full recovery light.” Under this option, regular transactions are logged just as they are with the full recovery method, but bulk operations are not. The result is that, in the event of system failure, a restored backup will contain any changes to data pages that did not participate in bulk operations (bulk import of data or index creation, for example), but any bulk operations must be redone. The good news on this one is that bulk operations perform much better. This performance comes with risk attached, so your mileage may vary.
❑ Simple: Under this model, the transaction log essentially exists merely to support transactions as they happen. The transaction log is regularly truncated, with any completed or rolled back transactions essentially being removed from the log (not quite that simple, but that is the effect). This gives us a nice tight log that is smaller and often performs a bit better, but the log is of zero use for recovery from system failure. For most installations, full recovery is going to be what you want to have for a production-level database. End of story. Recovery This is something of the reverse of the backup side of things. You’ve done your backups religiously, and now you want to restore one, either for recovery purposes or merely to make a copy of a database somewhere. Once you have a backup of your database, it’s fairly easy to restore it to the original location. To get started, it works much as it did for backup: Navigate to the database you want to restore to and rightclick; then select Tasks ➪ Restore and up comes your Restore dialog box, as shown in Figure 19-16. Figure 19-16 Chapter 19: Playing Administrator As long as what you’re after is to take your old backup and slam it over the top of the database you made the backup of, this is pretty straightforward; simply say OK, and it should restore for you without issue. 579
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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 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 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 SQL
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Chapter 16: A Brief XML Primer If,
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Chapter 17: Reporting for Duty, Sir
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Appendix A: System Functions The qu
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Appendix A: System Functions ASCII
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Appendix A: System Functions The ch
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Appendix A: System Functions UNICOD
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Appendix A: System Functions Text a
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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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