I’ve grown up reading Tom Clancy and probably most of you have at least seen Red October, so this book caught my eye when browsing used books for a recent trip. It’s a fairly human look at what’s involved in sailing on a Trident missile submarine…
My company heavily uses MSX/TSX jobs for everything. But our SAN doesn’t necessarily like if we run all our index maintenance, backups, and integrity checks at the same time. So here is a quick little post on how you can schedule the workload to spread out across all your servers across multiple time blocks and still have only one job.
First, you need to decide how many time blocks or hours you want the jobs to run in. So let’s start with scenario one where you pick for example four time blocks. First, you declare a variable with the time block in it and we will feed in the @@SERVERNAME to let determine a value for the time block that server will run. Then we wrap our code around our time block, our example we will run Index Maintenance for a 12 period spread out for three hours. Mind you for my index process which I probably should blog about as well I am processing one index at a time have something that BREAKs out of the procedure when it exceeds the time block it is. So below we run Index Maintenace between start the index maintenance job on a server between the hours 6 PM and 5 AM based on the time block value we got back.
DECLARE @TimeBlock INT = ABS(CHECKSUM(@@SERVERNAME))%4+1 --Returns a value between 1 and 4 based on @@SERVERNAME IF (@TimeBlock = 1 AND (CONVERT(INT,(DATEPART(HOUR,GETDATE()))) >= 21 OR CONVERT(INT,(DATEPART(HOUR,GETDATE()))) < 18)) OR (@TimeBlock = 2 AND CONVERT(INT,(DATEPART(HOUR,GETDATE()))) >= 0) OR (@TimeBlock = 3 AND CONVERT(INT,(DATEPART(HOUR,GETDATE()))) >= 3) OR (@TimeBlock = 4 AND CONVERT(INT,(DATEPART(HOUR,GETDATE()))) >= 6) BEGIN --Run code for index maintenace END
Using the same concept we could spread out when out backups start on our servers at night by using the following code:
DECLARE @Hour INT = ABS(CHECKSUM(@@SERVERNAME))%5 --Returns a value between 1 and 4 based on @@SERVERNAME IF @Hour = CONVERT(INT,(DATEPART(HOUR,GETDATE()))) BEGIN --Run backups END
If you are using MSX/TSX you can now consolidate your jobs, if you aren’t using MSX/TSX explore it, it does make managing your jobs easier. This can use with Ola Hallengren’s scripts or MinionWare scripts or any other scripts you need to run for maintenance across all your servers during a certain window of time without saturating you SAN.