Join Query with LIKE in PHP Mysql

Join Query with %LIKE% function in MYSQL PHP

SELECT `customers`.*, `admin`.`firstname` AS `salespersonfname`, `admin`.`lastname` AS `salespersonlname`
FROM `customers`
LEFT JOIN `admin` ON customers.tags LIKE CONCAT('%', `admin`.firstname, ' ', `admin`.lastname, '%')
ORDER BY `id` DESC

How to get filter data from report filter string | parameter URL in Magento 1

$filterData = Mage::helper('adminhtml')->prepareFilterString($this->getRequest()->getParam('filter', false));

print_r($filterData);exit;

SQLSTATE[42S22]: Column not found: 1054 Unknown column '' in 'having clause', query was: SELECT COUNT(*) in Magento 1

Step 1. Open Collection.php of that model : root/app/code/local/Jaydip/Kansagra/Model/Resource/Rebatecash/Collection.php

Step 2.  Create getSelectCountSql() function in Collection.php file
public function getSelectCountSql() {
        $this->_renderFilters();
        $select = clone $this->getSelect();
        $select->reset(Zend_Db_Select::ORDER);
        $select->reset(Zend_Db_Select::LIMIT_COUNT);
        $select->reset(Zend_Db_Select::LIMIT_OFFSET);       
        $countSelect = clone $this->getSelect();
        $countSelect->reset();
        $countSelect->from(array('a' => $select), 'COUNT(*)');
        return $countSelect;
    }

Optimized my.cnf MySQL configuration due to hign CPU usage in Ubuntu

# Optimized my.cnf configuration for MySQL/MariaSQL
#
# by Fotis Evangelou, developer of Engintron (engintron.com)
#
# === Updated July 2018 ===
#
# The settings provided below are a starting point for a 2GB - 4GB RAM server with 2-4 CPU cores.
# If you have less or more resources available you should adjust accordingly to save CPU,
# RAM and disk I/O usage.
# The settings marked with a specific comment or the word "UPD" after the value
# should be adjusted for your system by using database diagnostics tools like:
# https://github.com/major/MySQLTuner-perl
# or
# https://launchpad.net/mysql-tuning-primer (supports MySQL up to v5.6)
#
#
# Note that if there is NO comment after a setting value, then 99,9% of the times you won't need to adjust it.
#
#
# THINGS TO DO AFTER YOU UPDATE MY.CNF - TROUBLESHOOTING
# If any terminal commands are mentioned, make sure you execute them as "root" user.
# If MySQL cannot start or restart, then perform the following actions.
#
# 1. If the server had the stock database configuration and you added or updated any
#    "innodb_log_*" settings (as suggested below), then execute these commands ONLY
#    the first time you apply this configuration:
#
#    $ rm -rvf /var/lib/mysql/ib_logfile*
#    $ chown -R mysql:mysql /var/lib/mysql
#    $ service mysql restart
#
#    or use the shorthand command:
#    $ rm -rvf /var/lib/mysql/ib_logfile*; chown -R mysql:mysql /var/lib/mysql; service mysql restart
#
# 2. If the setting "bind-address" is not commented out, then make sure the file /etc/hosts is
#    properly configured. A good example of a "clean" /etc/hosts file is something like this:
#
#    127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4
#    ::1       localhost localhost.localdomain localhost6 localhost6.localdomain6
#    1.2.3.4   hostname.domain.tld hostname # Replace accordingly!
#
#    Finally restart the database service:
#
#    $ service mysql restart
#
# 3. If the database service cannot restart even after the first 2 steps, make sure the database data folder
#    (common for either MySQL or MariaDB) "/var/lib/mysql" is owned by the "mysql" user AND group.
#    Additionally, the folder itself can have 0751 or 0755 file permissions. To fix it, simply do this:
#    $ chown -R mysql:mysql /var/lib/mysql
#    $ chmod 0755 /var/lib/mysql
#
#    Finally restart the database service:
#
#    $ service mysql restart
[mysql]
port                            = 3306
socket                          = /var/run/mysqld/mysqld.sock
[mysqld]
# Required Settings
basedir                         = /usr
bind_address                    = 127.0.0.1 # Change to 0.0.0.0 to allow remote servers to connect to this server's
                                            # database instance
datadir                         = /var/lib/mysql
max_allowed_packet              = 256M
max_connect_errors              = 1000000
pid_file                        = /var/run/mysqld/mysqld.pid
port                            = 3306
skip_external_locking
skip_name_resolve
socket                          = /var/run/mysqld/mysqld.sock
#sql_mode                       = ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION,ONLY_FULL_GROUP_BY,STRICT_TRANS_TABLES # Enable for b/c with databases
                                                                                                                                               # using null dates
tmpdir                          = /tmp
user                            = mysql
# InnoDB Settings
default_storage_engine          = InnoDB
innodb_buffer_pool_instances    = 1     # Use 1 instance per 1GB of InnoDB pool size
innodb_buffer_pool_size         = 1G    # Use up to 70-80% of RAM & optionally check if /proc/sys/vm/swappiness is set to 0
innodb_file_per_table           = 1
innodb_flush_log_at_trx_commit  = 0
innodb_flush_method             = O_DIRECT
innodb_log_buffer_size          = 16M
innodb_log_file_size            = 128M
#innodb_thread_concurrency      = 4     # Optional: Set to the number of CPUs on your system (minus 1 or 2) to better
                                        # contain CPU usage. E.g. if your system has 8 CPUs, try 6 or 7 and check
                                        # the overall load produced by MySQL/MariaDB.
# MyISAM Settings
query_cache_limit               = 4M    # UPD
query_cache_size                = 48M   # UPD
query_cache_type                = 1
key_buffer_size                 = 48M   # UPD
low_priority_updates            = 1
concurrent_insert               = 2
# Connection Settings
max_connections                 = 100   # UPD
back_log                        = 512
thread_cache_size               = 100
thread_stack                    = 192K
interactive_timeout             = 180
wait_timeout                    = 180
# Buffer Settings
join_buffer_size                = 3M    # UPD
read_buffer_size                = 2M    # UPD
read_rnd_buffer_size            = 4M    # UPD
sort_buffer_size                = 4M    # UPD
# Table Settings
# In systemd managed systems like Ubuntu 16.04 or CentOS 7, you need to perform an extra action for table_open_cache & open_files_limit
# to be overriden (also see comment next to open_files_limit).
# E.g. for MySQL 5.7, please check: https://dev.mysql.com/doc/refman/5.7/en/using-systemd.html
# and for MariaDB check: https://mariadb.com/kb/en/library/systemd/
table_definition_cache          = 8000  # UPD
table_open_cache                = 8000  # UPD
open_files_limit                = 24000 # UPD - This can be 2x to 3x the table_open_cache value or match the system's
                                        # open files limit usually set in /etc/sysctl.conf or /etc/security/limits.conf
                                        # In systemd managed systems this limit must also be set in:
                                        # /etc/systemd/system/mysqld.service.d/override.conf (for MySQL 5.7+) and
                                        # /etc/systemd/system/mariadb.service.d/override.conf (for MariaDB)
max_heap_table_size             = 128M
tmp_table_size                  = 128M
# Search Settings
ft_min_word_len                 = 3     # Minimum length of words to be indexed for search results
# Logging
log_error                       = /var/lib/mysql/mysql_error.log
log_queries_not_using_indexes   = 1
long_query_time                 = 5
slow_query_log                  = 0     # Disabled for production
slow_query_log_file             = /var/lib/mysql/mysql_slow.log
[mysqldump]
# Variable reference
# For MySQL 5.7: https://dev.mysql.com/doc/refman/5.7/en/mysqldump.html
# For MariaDB:   https://mariadb.com/kb/en/library/mysqldump/
quick
quote_names
max_allowed_packet              = 64M

Refer From : https://gist.github.com/fevangelou/fb72f36bbe333e059b66 

How to get only one record in Join Query in Magento

$orders->getSelect()->join(["Category" => "catalog_category_product"], "Category.category_id=(
    select category_id from catalog_category_product AS p1 where SFOI.product_id = p1.product_id limit 1
    ) AND SFOI.product_id=Category.product_id", []);

Mysql usage grater than 100% of CPU in ubuntu 18.04 | 16.04 in AWS

 You need to update server configuration.

1. Open terminal

2. Put command : sudo nano /etc/mysql/mysql.conf.d/mysqld.cnf

3. Find following variables
key_buffer_size         = 16M
max_allowed_packet      = 16M
thread_stack            = 192K
thread_cache_size       = 8
query_cache_limit      = 1M
query_cache_size        = 16M
Change To
key_buffer_size         = 160M
max_allowed_packet      = 160M
thread_stack            = 1920K
thread_cache_size       = 80
query_cache_limit       = 1024M
query_cache_size        = 2048M

4. Restart mysql : sudo /etc/init.d/mysql restart

5. Restart apache2 sudo systemctl restart apache2

6. Check CPU usage : ps -eo pid,ppid,cmd,%mem,%cpu --sort=-%cpu | head

 For more Information please Refer : https://dev.mysql.com/doc/refman/5.7/en/server-configuration.html

How to override third party vendor block file in magento 2.2

If you need to override third party or Magento file from vendor directory

Here I override Block file "/var/www/html/magento/magentoproject/vendor/onestop/image-server/Block/Product/View/Gallery.php"

FYI : You need to create new extension when you wish to override default Vendor or Magento file

1. Create new Extension - Jaydip (Namespace)

2. Create Module directory - ImagegalleryAlt (Modulename)

3. Create new file like ( /var/www/html/magento/magentoproject/app/code/Jaydip/ImagegalleryAlt/etc/di.xml )

<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">
  <preference for="Onestop\ImageServer\Block\Product\View\Gallery" type="Jaydip\ImagegalleryAlt\Block\Product\View\Gallery" />
</config>

4. Create new directory "etc" and create file like : /var/www/html/magento/magentoproject/app/code/Jaydip/ImagegalleryAlt/etc/module.xml

<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:noNamespaceSchemaLocation="urn:magento:framework:Module/etc/module.xsd">
    <module name="Jaydip_ImagegalleryAlt" setup_version="0.1.1">
        <sequence>
            <module name="Magento_Catalog"/>
            <module name="Onestop_ImageServer"/>
        </sequence>
    </module>
</config>

5. Create new directory "Block/Product/View" and create file like : /var/www/html/magento/magentoproject/app/code/Jaydip/ImagegalleryAlt/Block/Product/View/Gallery.php

• Copy file from old directory and paste to : /var/www/html/magento/magentoproject/app/code/Jaydip/ImagegalleryAlt/Block/Product/View/Gallery.php

• Open : /var/www/html/magento/magentoproject/app/code/Jaydip/ImagegalleryAlt/Block/Product/View/Gallery.php

• Change namespace like : namespace Jaydip\ImagegalleryAlt\Block\Product\View;

6. Upgrade data in Magento 2
php -dmemory_limit=5G bin/magento setup:upgrade

7. Static Content Deploy data  in Magento 2
php -dmemory_limit=5G bin/magento setup:static-content:deploy -f

8. Finish!!!