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School - 1st Class Notes

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https://www.activityshelter.com/wp-content/uploads/2023/

Vector Databases with Different Index Types

Git Aliases

alias gs="git status" alias gpo="git push origin" alias guo="git pull origin" alias gc="git commit -m" alias ga="git add" alias gt="git log --graph --oneline --all" alias gb="git branch --all" alias gbd="git branch -d"

Elasticsearch Troubleshoot

https://opster.com/guides/opensearch/opensearch-basics/opensearch-heap-size-usage-and-jvm-garbage-collection/

https://opster.com/guides/elasticsearch/operations/elasticsearch-max-shards-per-node-exceeded/

https://opster.com/guides/elasticsearch/how-tos/search-latency-guide/

https://opster.com/guides/elasticsearch/operations/elasticsearch-oversharding/

https://aws.amazon.com/blogs/big-data/understanding-the-jvmmemorypressure-metric-changes-in-amazon-opensearch-service/

https://confluence.atlassian.com/bitbucketserverkb/elasticsearch-index-fails-due-to-garbage-collection-overhead-1044803633.html

https://www.elastic.co/guide/en/elasticsearch/reference/current/size-your-shards.html#shard-size-recommendation

https://docs.aws.amazon.com/opensearch-service/latest/developerguide/managedomains-cloudwatchmetrics.html

https://discuss.elastic.co/t/elasticsearch-problem-search-thread-pool-rejected/114446

https://aws.amazon.com/premiumsupport/knowledge-center/opensearch-resolve-429-error/

https://opster.com/guides/opensearch/opensearch-basics/threadpool/

https://aws.amazon.com/premiumsupport/knowledge-center/opensearch-troubleshoot-high-cpu/

http://man.hubwiz.com/docset/ElasticSearch.docset/Contents/Resources/Documents/www.elastic.co/guide/en/elasticsearch/reference/current/modules-threadpool.html

https://stackoverflow.com/questions/61788792/elasticsearch-understanding-threadpool

https://www.elastic.co/guide/en/cloud/current/ec-monitoring.html

https://www.elastic.co/guide/en/cloud/current/ec-cpu-usage-exceed-allowed-threshold.html

https://www.elastic.co/blog/managing-and-troubleshooting-elasticsearch-memory

https://opster.com/guides/elasticsearch/capacity-planning/elasticsearch-memory-usage/

CORS Articles

https://simplelocalize.io/blog/posts/what-is-cors/

#cors

Algolia Alternatives

Alternatives to algoila

https://www.luigisbox.com/

https://github.com/typesense/typesense

https://www.addsearch.com/

https://www.bloomreach.com/en/products/discovery

Airtable Alternatives - OpenSource

Alternatives to Airtable

https://github.com/directus/directus

https://github.com/bram2w/baserow

https://github.com/nocodb/nocodb

#airtable #allternative #opensource

Final vs Const at Dart Lang

"final" means single-assignment: a final variable or field must have an initializer. Once assigned a value, a final variable's value cannot be changed. final modifies variables.

"const" has a meaning that's a bit more complex and subtle in Dart. const modifies values. You can use it when creating collections, like const [1, 2, 3], and when constructing objects (instead of new) like const Point(2, 3). Here, const means that the object's entire deep state can be determined entirely at compile time and that the object will be frozen and completely immutable.

So, what does this mean?

Const: If the value you have is computed at runtime (new DateTime.now(), for example), you can not use a const for it. However, if the value is known at compile time (const a = 1;), then you should use const over final. There are 2 other large differences between const and final. Firstly, if you're using const inside a class, you have to declare it as static const rather than just const. Secondly, if you have a const collection, everything inside of that is in const. If you have a final collection, everything inside of that is not final.

Final: final should be used over const if you don't know the value at compile time, and it will be calculated/grabbed at runtime. If you want an HTTP response that can't be changed, if you want to get something from a database, or if you want to read from a local file, use final. Anything that isn't known at compile time should be final over const.

https://stackoverflow.com/questions/50431055/what-is-the-difference-between-the-const-and-final-keywords-in-dart

Eloquent way

* hasOne / hasMany (1-1, 1-M) -save(new or existing child) -saveMany(array of models new or existing) -create(array of attributes) -createMany(array of arrays of attributes) --------------------------------------------------------------------------- * belongsTo (M-1, 1-1) -associate(existing model) --------------------------------------------------------------------------- * belongsToMany (M-M) -save(new or existing model, array of pivot data, touch parent = true) -saveMany(array of new or existing model, array of arrays with pivot ata) -create(attributes, array of pivot data, touch parent = true) -createMany(array of arrays of attributes, array of arrays with pivot data) -attach(existing model / id, array of pivot data, touch parent = true) -sync(array of ids OR ids as keys and array of pivot data as values, detach = true) -updateExistingPivot(relatedId, array of pivot data, touch) --------------------------------------------------------------------------- * morphTo (polymorphic M-1) // the same as belongsTo --------------------------------------------------------------------------- * morphOne / morphMany (polymorphic 1-M) // the same as hasOne / hasMany --------------------------------------------------------------------------- * morphedToMany /morphedByMany (polymorphic M-M) // the same as belongsToMany

Log Viewers

https://goaccess.io/

https://www.netdata.cloud/

https://github.com/rolandstarke/access-log-viewer

https://www.graylog.org/products/open-source

https://www.nagios.org/downloads/

https://logstalgia.io/

https://github.com/Octopussy-Project/Octopussy_Documentation/blob/master/00_Documentation.md

Laravel Redis Cache

To reach the redis instance and get the keys of the cache :

$prefix = config('cache.prefix') . ':programatic_prefix_'; $redisInstance = app('cache')->store('redis')->getRedis(); $redisInstance->select(config('database.redis.cache.database')); $keys = $redisInstance->keys($prefix . '*"'); $redisInstance->del($keys);

#laravel #redis #instance #cache #keys

Macbook Pro Restart after Sleep

Source : https://apple.stackexchange.com/questions/361635/macbook-pro-error-report

panic(cpu 0 caller 0xffffff800c49167c): Sleep transition timed out after 180 seconds while calling power state change callbacks. Suspected bundle: com.apple.iokit.IOGraphicsFamily. Thread 0x6565. Backtracing specified thread

You need to run below command if the macbook pro restarting after sleep cycle with above error report:

sudo pmset -a darkwakes 0

https://blog.ankuranand.com/2019/02/20/a-visual-guide-to-golang-memory-allocator-from-ground-up/

https://www.techiedelight.com/list-of-problems/

https://www.quora.com/What-is-a-coders-worst-nightmare/answer/Mick-Stute?share=1

#read later

Hive vs HBase

Source : https://www.dezyre.com/article/hive-vs-hbase-different-technologies-that-work-better-together/322

Hive is query engine that whereas HBase is a data storage particularly for unstructured data.

Apache Hive is mainly used for batch processing i.e. OLAP but HBase is extensively used for transactional processing wherein the response time of the query is not highly interactive i.e. OLTP.

Unlike Hive, operations in HBase are run in real-time on the database instead of transforming into mapreduce jobs. HBase is to real-time querying and Hive is to analytical queries.

Links :

https://www.facebook.com/note.php?note_id=454991608919

https://www.xplenty.com/blog/hive-vs-hbase/

https://dzone.com/articles/big-data-versus-apache-hive-vs-apache-hbase

#hive #hbase #hadoop

Systemctl looping error fix

Dec 19 07:40:13 vmi46714 systemd[1]: Looping too fast. Throttling execution a little. Dec 19 07:40:15 vmi46714 systemd[1]: Looping too fast. Throttling execution a little. Dec 19 07:40:16 vmi46714 systemd[1]: Looping too fast. Throttling execution a little.

to fix that :

systemctl daemon-reexec

#systemclt #looping-fast #looping #centos #linux

Free Inactive Memory for Linux

free -m && sync && echo 3 > /proc/sys/vm/drop_caches && echo "" && free -m

#linux #memory #free #inactive

Swagger PHP

/** * @OA\Info(title="API Interface", * description="", * version="0.1" * ) * * @OA\SecurityScheme( * type="apiKey", * securityScheme="Bearer", * name="Authorization", * description="Please insert JWT with Bearer into field", * in="header" * ) * @OA\SecurityScheme( * type="oauth2", * scheme="bearer", * securityScheme="oauth2", * description="OAuth2 Security", * bearerFormat="JWT", * name="Authorization", * in="header", * flows={ * @OA\Flow( * flow="password", * tokenUrl="/access_token", * scopes={"basic"} * ), * @OA\Flow( * flow="authorizationCode", * authorizationUrl="/authorize", * tokenUrl="/access_token", * scopes={"basic"} * ) * } * ) */ /** * Authenticated Member Information * * @OA\Get( * path="/me", * tags={"me"}, * security={ { "Bearer": {} }, {"oauth2": {}} }, * @OA\Response(response="200", description="Autheticated Member Information"), * @OA\Response(response="500", description="Internal Server Error"), * ) */

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