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Database Development

Statistics Update Time is missing in Actual execution plan

I remember that I have seen somewhere in the past that when I saw the XML of the actual execution plan, it had the details about when the stats were updated on the indexes on a table and what was the number of rows sampled. I am not able to find that info now. Is […]

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Ask Games RPG Games

Allowing Disengage for free

I’m the DM, and I’m concerned that combat feels pretty static. As I understand it in RAW: Once you’ve reached melee range, moving further away will provoke an opportunity attack, unless you disengage disengage costs an action (unless you have a feature that lets you do it for free) This seems to mean adventurers who […]

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Ask Chemistry

Why I get acidic solution at brine anode?

I have decomposed $\ce{NaCl}$ solution (brine) with electrolysis and yield $\ce{NaOH}$ at cathode, at anode I got acidic while expected was $\ce{NaClO}$ (alkaline) if it is $\ce{HOCl + HCl}$. Where does sodium ion goes, and if it doesn’t, then why?

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Ask Chemistry

Vapour pressure and Raoult’s Law

The following question from my textbook assignment reads A mixture contains $1$ mole volatile liquid $A$ ($P_\mathrm A^\circ = \pu{100 mmHg}$) and $3$ moles of volatile liquid $B$ ($P_\mathrm B^\circ = \pu{80 mmHg}$). If the solution behaves ideally, the total vapour pressure of the distillate is? Using Raoult’s Law: \begin{align} P_\text{total} &= P_\mathrm A^\circ \times […]

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Linux Mastering Development

redis-server doesn’t start as a service on Debian 10 because of status=227/NO_NEW_PRIVILEGES

I have a Debian 10 server I’m trying to install and run Redis as a service, which won’t start because and error related to NoNewPriviliges. I’m having a really hard time debugging this. I tried reading up on this, but I don’t see what the problem could be. The output from systemctl status redis-server.service is […]

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Linux Mastering Development

HDFS + how to compare disks throughput

we have hadoop cluster with 10 data-nodes machines each data-node machine have the following disks that are belong to HDFS file system /dev/sdk 1922721048 1095146788 827557876 57% /data/sdk /dev/sdm 1922721048 249442396 1673262268 13% /data/sdm /dev/sdd 1922721048 363184672 1559519992 19% /data/sdd /dev/sdf 1922721048 333223328 1589481336 18% /data/sdf /dev/sdb 1922721048 341232820 1581471844 18% /data/sdb /dev/sdj 1922721048 247172184 […]

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Linux Mastering Development

Keyboard isn’t detected on boot, but works after suspend

When I boot up my system (I’m using Ubuntu 20.04), the keyboard isn’t detected. The only way to have it working is to suspend the system and wake it up back. Then the keyboard is fully functioning. I tried using different acpi_osi kernel parameters without success. The same happens with differents Live USB. The keyboard […]

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Linux Mastering Development

Gnuplot Control File Calculate and plot using formula

I have a shell script that produces gnuplot control file and i want to calculate percentage decrease between two data sets and plot along with points on charts. The control file is as follows: plot ‘-‘ title ‘S1’ pt 4 lc rgb ‘black’ dt 4 with yerrorlines , ‘-‘ title ‘S2’ pt 3 lc rgb […]

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Linux Mastering Development

mv command. Files cannot be found and disappeared?

I used the following command for the purpose of moving several torrent files in a given folder to a subfolder (TorrentFiles). Command : sudo mv **/*.torrent ./TorrentFiles So, all .torrent files should have been moved to TorrentFiles subdirectory. Now, I can’t find the files anywhere. I have been looking in quite a few places, and […]

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Linux Mastering Development

Focal Fossa :- ACPI Error: No handler for Region [RAM_] ((____ptrval____)) [EmbeddedControl] 20190816/evregion-127

I am getting folowing error messages on 20.04 Focal I tried finding out if it is answered I could not find a satisfatory answer so this Query I am attaching the Image with other errors as well ( Just in case they are related )