MongoDB ticket availability reaching zero

I recently came across intresting issue. I have a sharded cluster which has two replication sets with 2 secondaries. On my primaries, there were 300-400 connections at a point in time, shortly after sometime around a minutes spane, there were almost read and write connections in total 1200 spiked over primaries. Read and write ticket availability went down to 0 for few seconds. Cluster was non responsive during that time. Cluster usually handels more load then this during month end. Any suggestions to find cause of this issue?

Second derivative Test becomes zero

Consider the domain 𝐷 = { (π‘₯,𝑦) ∈ ℝ2:π‘₯ ≀ 𝑦 } and the function β„Ž: 𝐷 β†’ ℝ defined by $ β„Ž((π‘₯,𝑦)) = (π‘₯ βˆ’2)^4 +(π‘¦βˆ’1)^4$ ,(π‘₯,𝑦) ∈ 𝐷. find the minimum value of h in the domain D , a) $ 1/2$
b) $ 1/4$
c) $ 1/8$
d) $ 1/16$

My work:
$ fβ€²(x) = 4(x-2)^3$
$ fβ€²(y) = 4(y-1)^3$
$ f”(x) = 12(x-2)^2$
fxy = $ 4(y-1)^3$ (partial derivative of x,y)
Critical points are x = 2 and y = 1 ,
Performing second derivative test with x = 2 and y = 1 I get zero , How do I proceed and where have I gone wrong? kindly help . The answer is Option C: 1/8

I have a “non zero exit code (101) issue

I installed python 3.7.2 64 bit for windows, and I also downloaded the embedded files. I also downloaded pycharm. When I tried to create a project in pycharm I got a “non zero exit code(101)” error. The command output is {unable to create process using ‘C:\Users\Chana Riva\AppData\Local\Programs\Python\Python37\python.exe “C:\Program Files\JetBrains\PyCharm Community Edition 2018.3.2\helpers\packaging_tool.py” list’}

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sort a mysql result order depending if it’s zero or not

I have a mysql table which has values and dates, this is what I'm trying to accomplish in the mysql query:

sort value DESC, (value>0 ? date asc : date desc)

It will sort all values descending, then the equal values will be sorted by date ascending/descending depending if their value is zero or not

I tried a lots of combinations, but failed miserably :p