Posts Categorized: Technical Blog
Like good day and welcome to issue 6 eh. This is another light one as it’s been another busy week. I have not had any time of my own to crawl through the news, but luckily my cohort Bill has flagged some good stuff for this week. Let’s get to it.
Here is a must-read whitepaper describing SQL Server Scheduling and how to interpret and diagnose Errors 17883, 17884, 17887, and 17888; please look here How To Diagnose and Correct Errors 17883, 17884, 17887, and 17888. We had a client having same issue. The client runs a busy online business with thousands of connected users; databases sometimes include more than half a million tables. We had a healthy counters and server didn’t seem to suffer from memory or I/O bottlenecks. We did suspect, that it is something to do with SQL Server internals, as we also received fatal exceptions pertaining to SPIDs <50 (system processes). If you face similar issues, you should install the latest service pack and cumulative update, and check if you have any resource bottlenecks. You can try trace T2330 as well, and if you still get errors or dumps, then you had better open a case with Microsoft Support to analyze the dumps and provide a resolution.
This is a little tip for those who develop or debug SSIS packages. In SQL Server Integration services, User namespace variables are assigned values that are used across the package. When developing, testing or debugging packages, we assign multiple values to those variables to test different scenarios. This is done using the variables window. However, SSIS Script tasks can allow us to key in values for selected variables in run time. This looks more fun and keeps us from taking chances when we forget assigning variables’ values.
For the past two months, I have been running tests on TokuDB in my free time. TokuDB is a storage engine put out by Tokutek. TokuDB uses fractal tree indexes instead of B-tree indexes to improve performance, which is dramatically noticeable when dealing with large tables (over 100 million rows). For those that like the information “above the fold”, here is a table with results from a test comparing InnoDB and TokuDB. All the steps are explained in the post below, if you want more details.
When MySQL is first installed on Ubuntu/Debian, this problem never occurs because the package as part of the post installation process randomly creates a password for the debian-sys-maint user, creates the user in MySQL (during the initial installation the root MySQL user has no password so is able to login as root), and creates the /etc/mysql/debian-my.cnf file on the system. So what’s the solution? Well, there are ways to deal with it.
Now that our new web-site is live I’d like to do the first blog post on it!
You shouldn’t be surprised if you notice that it’s difficult to locate your DBAs in the first week of December (i.e. in just two weeks from now)! And you know why? Because you need to be looking in the right place to find them.
Last night at the Boston MySQL User Group I presented on how to get a consistent snapshot to build a slave, use mk-table-checksum to check for differences between masters and slaves on an ongoing basis, and how to use tools such as mk-table-sync and mysqldump to sync the data if there are any discrepancies. The links to the slides and video are here.
Hi all, and welcome back to blogrotate. It’s been a busy week here at Pythian which reduced the amount of time I had for cruising the news, so this weeks edition will be a short one. Here’s a few of the stories that tweaked our interest this week.
I’d read that DTS packages could be stored on SQL Server 2005 64-bit, but not executed on this server. Workarounds I’ve seen range from creating SSIS packages with Execute DTS tasks, migrations to SSIS using the wizard or third party tools, and running the DTS Packages from a 32-bit server against the 64-bit target. Recently (and much to my embarrassment after making that statement), a colleague demonstrated that this is not correct.
This is the 168th edition of Log Buffer, the weekly review of database blogs. Let’s give the wheel a spin and see who comes first . . .