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When I discovered that using command substitution to store the results of a function in a variable was so slow (in all shells except ksh93) that it severely reduced the advantage of using functions, I started looking for ways to mitigate the phenomenon. For a while I tried using a variable to tell a function whether to print the result: [ ${SILENT_FUNCS:-0} = 1 ] || echo "${_FPMUL}"

First, create a credential in the SQL Server secure store. This credential is the actual Windows identity that the SQL Server Agent service will impersonate before it executes the job step. CREATE CREDENTIAL [DevCredential] WITH IDENTITY='<<Domain\Username>>',

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SECRET='<<password>>' Next, create the Agent proxy account that references this credential, as follows: USE MSDB GO sp_add_proxy @proxy_name = 'SSISDevProxy', @enabled = 1, @description = 'proxy account used by developers to test their SSIS packages', @credential_name = 'DevCredential' At this point, the proxy account is neither assigned to any subsystems nor accessible by anyone except members of the sysadmin role. Assign the proxy account to the SSIS subsystem as follows: sp_grant_proxy_to_subsystem @proxy_name = N'SSISDevProxy', @subsystem_name = N'SSIS' Finally, grant the SQL Server login Tammie the ability to use this new proxy account, as follows: sp_grant_login_to_proxy @login_name = N'Tammie', @proxy_name = N'SSISDevProxy' Now SQL Server login Tammie will be able to create a new job step of type SQL Server Integration Services Package and select SSISDevProxy as the proxy account under which to run when her package is executed.

This worked, but I found it ugly and cumbersome; when I didn t want a function to print anything, I had to set SILENT_FUNCS to 1 usually by preceding the call with SILENT_FUNCS=1. Occasionally, I could set it at the beginning of a section of code and have it in force for all subsequent function calls. I was well into writing this book when the solution occurred to me, and I had to backtrack and rewrite parts of earlier chapters to incorporate it. Whenever a function returns a value (other than an exit status), I now write two functions. One has the expected behavior of printing the result; the other, which begins with an underscore, sets a variable that is the function s name (including the underscore) converted to uppercase. To illustrate, here is a pair of functions to multiply two integers: _mul() { _MUL=$(( "$1" * "$2" )) } mul() { _mul "$@" && printf "%s\n" "$_MUL" } I can now print the result of the multiplication with $ mul 12 13 156 Or, I can store the result in a variable with $ _mul 12 13 $ product=$_MUL The extra few milliseconds it takes to use command substitution . . . $ time mul 123 456 56088 Real: 0.000 User: 0.000 System: 0.000 $ time { q=$(mul 123 456); } Real: 0.005 User: 0.001 System: 0.003 . . . may not seem significant, but scripts often loop hundreds or even thousands of times, and may perform several such substitutions inside a loop. The result is a sluggish program.

use SMTP transport rather than defaulting to the local server to test this mail functionality. I will explain how to do this later in the chapter.

All subsystems use proxy accounts with the exception of the T-SQL subsystem. In this case, the Agent service can impersonate the job owner through T-SQL and doesn t need to store the user s Windows credentials separately. System administrators won t need to create a proxy account for job steps of type T-SQL.

SQL Server Agent job schedules can be shared among jobs that are owned by the same user. For example, suppose you have a series of jobs that you would like to run every day at midnight. In previous versions of SQL Server, you would create a job and then create a separate schedule for each job, each executing at the same schedule time. In SQL Server 2008, you can create a single schedule (in this case, occurring every day at midnight), and attach it to one or more jobs, provided you are the owner of the jobs. For example, suppose that, using Management Studio, Greg creates a job, Job1, with a schedule, Schedule1. Since he was told to run jobs only starting at the time defined in Schedule1 by his system administrator, Greg wants to create his second job, called Job2, with this same schedule. Greg launches the New Job dialog box in Management Studio and, after supplying the name, clicks the Schedules tab and is presented with the dialog box shown in Figure 8-7.

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