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?

# Tag: zero

## What does it mean if you take the zero vector in the hyperplane separation theorem?

If you have two disjoint sets V and W, which are compact and convex, then by the separation theorem there exists a vector u such that u*v< u*w.

However what does it mean if you take u=0?

## Run Local site using UniServer Zero

Does anyone have tried to setup Magento 2.1 at UniServer Zero as Local server?

## Second derivative Test becomes zero

Consider the domain π· = { (π₯,π¦) β β2:π₯ β€ π¦ } and the function β: π· β β defined by $ β((π₯,π¦)) = (π₯ β2)^4 +(π¦β1)^4$ ,(π₯,π¦) β π·. find the minimum value of h in the domain D , a) $ 1/2$

b) $ 1/4$

c) $ 1/8$

d) $ 1/16$

**My work:**

$ fβ²(x) = 4(x-2)^3$

$ fβ²(y) = 4(y-1)^3$

$ f”(x) = 12(x-2)^2$

f_{xy} = $ 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**

## Is this function increasing in some neighborhood of zero.

Consider $ f(x)= x+x^2\sin(Ο/x)$

Does this monotonic in some neighborhood of zero?

I think it isn’t as $ x^2\sin {\pi/2}$ oscillates near zero. Even though amplitude of oscillation decreases,the function cannot be monotone.

But how can i prove this?

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## 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

## Non zero solution of $3x\cos(x) + (-3 + x^2)\sin(x)=0$

Ho can I find exact non-zero solution of $ 3x\cos(x) + (-3 + x^2)\sin(x)=0$ . Its plot shows, it has many non-zero solutions.