Showing posts from November, 2021

Digital Marketing

Monitor the bandwidth with nload


Limit AWS S3 Bandwidth

setting the “s3.max_bandwidth” option. Example: aws configure set default.s3.max_bandwidth 8MB/s This configuration is thread base. AWS S3 sync uses multiple threads. To limit s3 sync, you need to set its thread number too: aws configure set default.s3.max_concurrent_requests 2. This means s3 will consume 2*8=16MB/s You can monitor the bandwidth with nload nload

TLS certificate is needed for Postfix SMTP

In order to use TLS, the Postfix SMTP server generally needs a certificate and a private key.  Both must be in "PEM" format. The private key must not be encrypted, i.e., the key must be accessible without a password.

Node.js runs single-threaded, non-blocking, asynchronously programming, which is very memory efficient.

Node.js uses asynchronous programming

mysqldump: Got errno 28 on write

The error number 28 in SQL just conveys the meaning that you don’t have the appropriate space that is needed for the storage of the output, so in order to prevent and overcome this error, you have to keep your disk space free and available. Please log inor registerto add a comment.

Quantum computing could help address problems that are too challenging for even today's most powerful supercomputers

Azure Database for MySQL - Flexible Server.

Azure Database for MySQL - Flexible Server is a deployment mode designed to provide more granular control and flexibility over database management functions and configuration settings than the Single Server deployment mode. 

With Azure Chaos Studio, users can apply chaos engineering

Azure Chaos Studio lets customers model and deliberately introduce faults that simulate real-world outages and validate how their application performs under those scenarios.

Gradle is efficient than Maven.

Gradle builds on Apache Ant and Maven, it uses a Groovy-based domain-specific language for describing builds.  Since its release in 2009, this tool has been gaining popularity steadily for multi-project builds.  Because of its incremental builds, build cache, and daemon, Gradle is efficient than Maven.

MongoDB allows related data to be embedded within a single document.

BSON is a computer data interchange format.

The name "BSON" is based on the term JSON and stands for "Binary JSON". It is a binary form for representing simple or complex data structures including associative arrays (also known as name-value pairs), integer indexed arrays, and a suite of fundamental scalar types.

MongoDB stores documents in collections

Collections are analogous to tables in relational databases.  If a collection does not exist, MongoDB creates the collection when you first store data for that collection.

MongoDB views are read-only

 Write operations on  MongoDB  views will error.

Document databases have become so powerful that even relational databases are trying to emulate them.

These JSON-like documents are flexible. Each document can have its own fields, and there’s no need to pre-define the schema in the database. It can be modified at any time. 

Trying to predict stock market crashes is notoriously hard

The Metaverse Is Going to Need WiFi

Chip Stocks to Play the Trend.

Payout ratios above 75% are not desirable because they may not be sustainable.

Ford Motor unveiled a custom truck

The truck combines its past with its future electrification plans, including its highly anticipated F-150 Lightning pickup in 2022.

Check file exists in Bash

## True if file exists. [[ -a ${file} ]] ## True if file exists and is a block special file. [[ -b ${file} ]] ## True if file exists and is a character special file. [[ -c ${file} ]] ## True if file exists and is a directory. [[ -d ${file} ]] ## True if file exists. [[ -e ${file} ]] ## True if file exists and is a regular file. [[ -f ${file} ]] ## True if file exists and is a symbolic link. [[ -h ${file} ]] ## True if file exists and is readable. [[ -r ${file} ]] ## True if file exists and has a size greater than zero. [[ -s ${file} ]] ## True if file exists and is writable. [[ -w ${file} ]] ## True if file exists and is executable. [[ -x ${file} ]] ## True if file exists and is a symbolic link. [[ -L ${file} ]]