mysql memoty tuning

 https://www.percona.com/blog/2016/05/03/best-practices-for-configuring-optimal-mysql-memory-usage/

mysql memory calculator

 #!/bin/sh# you might want to add some user authentication here

mysql -e "show variables; show status" | awk '  
{
VAR[$1]=$2  
}
END {  
MAX_CONN = VAR["max_connections"]  
MAX_USED_CONN = VAR["Max_used_connections"]  
BASE_MEM=VAR["key_buffer_size"] + VAR["query_cache_size"] + VAR["innodb_buffer_pool_size"] + VAR["innodb_additional_mem_pool_size"] + VAR["innodb_log_buffer_size"]  
MEM_PER_CONN=VAR["read_buffer_size"] + VAR["read_rnd_buffer_size"] + VAR["sort_buffer_size"] + VAR["join_buffer_size"] + VAR["binlog_cache_size"] + VAR["thread_stack"] + VAR["tmp_table_size"]  
MEM_TOTAL_MIN=BASE_MEM + MEM_PER_CONN*MAX_USED_CONN  
MEM_TOTAL_MAX=BASE_MEM + MEM_PER_CONN*MAX_CONN
printf "+------------------------------------------+--------------------+\n"  
printf "| %40s | %15.3f MB |\n", "key_buffer_size", VAR["key_buffer_size"]/1048576  
printf "| %40s | %15.3f MB |\n", "query_cache_size", VAR["query_cache_size"]/1048576  
printf "| %40s | %15.3f MB |\n", "innodb_buffer_pool_size", VAR["innodb_buffer_pool_size"]/1048576  
printf "| %40s | %15.3f MB |\n", "innodb_additional_mem_pool_size", VAR["innodb_additional_mem_pool_size"]/1048576  
printf "| %40s | %15.3f MB |\n", "innodb_log_buffer_size", VAR["innodb_log_buffer_size"]/1048576  
printf "+------------------------------------------+--------------------+\n"  
printf "| %40s | %15.3f MB |\n", "BASE MEMORY", BASE_MEM/1048576  
printf "+------------------------------------------+--------------------+\n"  
printf "| %40s | %15.3f MB |\n", "sort_buffer_size", VAR["sort_buffer_size"]/1048576  
printf "| %40s | %15.3f MB |\n", "read_buffer_size", VAR["read_buffer_size"]/1048576  
printf "| %40s | %15.3f MB |\n", "read_rnd_buffer_size", VAR["read_rnd_buffer_size"]/1048576  
printf "| %40s | %15.3f MB |\n", "join_buffer_size", VAR["join_buffer_size"]/1048576  
printf "| %40s | %15.3f MB |\n", "thread_stack", VAR["thread_stack"]/1048576  
printf "| %40s | %15.3f MB |\n", "binlog_cache_size", VAR["binlog_cache_size"]/1048576  
printf "| %40s | %15.3f MB |\n", "tmp_table_size", VAR["tmp_table_size"]/1048576  
printf "+------------------------------------------+--------------------+\n"  
printf "| %40s | %15.3f MB |\n", "MEMORY PER CONNECTION", MEM_PER_CONN/1048576  
printf "+------------------------------------------+--------------------+\n"  
printf "| %40s | %18d |\n", "Max_used_connections", MAX_USED_CONN  
printf "| %40s | %18d |\n", "max_connections", MAX_CONN  
printf "+------------------------------------------+--------------------+\n"  
printf "| %40s | %15.3f MB |\n", "TOTAL (MIN)", MEM_TOTAL_MIN/1048576  
printf "| %40s | %15.3f MB |\n", "TOTAL (MAX)", MEM_TOTAL_MAX/1048576  
printf "+------------------------------------------+--------------------+\n"  
}'

mysql dump import pagreitintuvas

  #!/bin/bash

DATA="/db.sql.gz"

SIZE="$(du $DATA | awk '{ print $1 }')K"

DBNAME="test"

DBPASS="Apasdasdasdfnti"

DBUSER="root"

{

    #echo "Dropping/creating database ${DBNAME}" >&2

    #echo "DROP DATABASE IF EXISTS ${DBNAME};"

    #echo "CREATE DATABASE ${DBNAME};"

    echo "use ${DBNAME};"

    echo "Setting speed settings" >&2

    echo "SET FOREIGN_KEY_CHECKS = 0;"

    echo "SET UNIQUE_CHECKS = 0;"

    echo "SET AUTOCOMMIT = 0;"

    echo "Loading data (this will take a while)" >&2

    cat $DATA | gzip -d

    echo "Resetting speed settings" >&2

    echo "SET FOREIGN_KEY_CHECKS = 1;"

    echo "SET UNIQUE_CHECKS = 1;"

    echo "COMMIT;"

    echo "Done." >&2

} | pv -ps $SIZE | mysql --password=$DBPASS --user=$DBUSER

#paprastas 1 eilutes pvz    

# pv /home/dnsb/dbtest.sql.gz | gunzip | mysql --password=Apdasdadti --user=root dbname

# pv dump.sql.gz | zcat | mysql -u user -ppasswd database

#nblogask itas pvz  https://github.com/servercollective/import-large-mysql-dump/blob/master/import.sh

#ddl="$ddl set global net_buffer_length=1000000; "

#ddl="$ddl set global max_allowed_packet=1000000000; "

Asmens kodų regex pagal ES šalis

 https://ipsec.pl/european-personal-data-regexp-patterns.html

LT pvz:  [3-6][0-9]{2}[0,1][0-9][0-9]{2}[0-9]{4}  

patikslintas: [3-6][0-9]{2}(1[0-2]|0[1-9])[0-3][0-9][0-9]{4}

(šaltinis):

[^0-9]  [0-5][0-9]{2}   (1[0-2]|0[1-9])  [0-3][0-9]  [0-9]{4}...

inode usage paieskos

 greitas top direktoriju radikjlis, randantis net giliai esancias direkmtorijas

{ find / -xdev -printf '%h\n' | sort | uniq -c | sort -k 1 -n; } 2>/dev/null

vienos direktorijos inode counteris:

find . -printf "%h\n" | cut -d/ -f-2 | sort | uniq -c | sort -rn

greitas trynimas senesniu nei 20d failu

find /opt/remi/php54/root/var/lib/php/session/ -atime +20 | xargs -r rm

php and web sockets

 http://socketo.me/  igalina paleisti php serveri klausanti kakzoki tai porta, kad galetume apdoroti websocket susijungimus, uzklausas

shell script as a daemon

 https://unix.stackexchange.com/questions/426862/proper-way-to-run-shell-script-as-a-daemon

template:

https://gist.github.com/shawnrice/11076762