Updating table causes high processor utlization super bowl ad gay dating site
A bad Malwarebytes updates released the last weekend caused the main process of the security product, mbamservice.exe, to experience high CPU usage on Windows systems, up to the point where computers were nearly impossible to use.
Company officials quickly responded to the complaints posted online, and a fix is already available to address the bug.
“The root cause of the issue was a malformed protection update that the client couldn't process correctly.
We have pushed upwards of 20,000 of these protection updates routinely.” The company recommends users to update Malwarebytes and to restart computers, but in case this doesn’t address the high CPU usage bug, they should download and run MB-CLEAN.
The only thing that I think might be a bit unusual about the system is that there is a relatively large number of tables and stored procedures.
If these slow statements aren't starved of CPU time, waiting on IO, waiting on a lock or starved of memory bandwidth, what actually is left as a possible cause of the slowdown?
This is most likely caused by the MERGE operation in SQL Server being single threaded.
However, I don't see how this could explain my problem.
The application loads data into some staging tables, then executes a series of stored procedures which merge the staging tables into the main tables. The solution is to manually parallelise the query by running multiple copies of the MERGE statement at the same time, each operating on their own subset of the data.
“As a side effect of the web protection blocks, the product also spiked memory usage and possibly caused a crash.
We have triaged this issue and pushed a protection update that resolves it,” the company says.
what I can observe about it when done from the application's connection.
The fact that perfmon reports low bytes/sec actually being transferred means that my query must just be being killed by the latency of disk requests: I suppose that when SQL server makes a disk request for some seek into for another row it could speculatively make an IO request for.
Search for updating table causes high processor utlization:
Last Trade Price, Volume, Open Price and lots more) are given their own table staging table, each with a corresponding stored procedure that implements the merge.