Update mysql.txt

mysql.txt

@@ -1,80 +1 @@
---- MYSQL ----------------------------------------------------------------------
 
-mysqld_safe - is the recommended way to start a mysqld server on Unix.
-  mysqld_safe adds some safety features such as restarting the server when an
-  error occurs and logging runtime information to an error log.
-
-  mysqld_safe reads all options from the [mysqld], [server], and [mysqld_safe]
-  sections in option files.
-
---------------------------------------------------------------------------------
-ENABLE LOGS:
-
-// To enable error log add following
-
-[mysqld_safe]
-log_error=/var/log/mysql/mysql_error.log
-[mysqld]
-log_error=/var/log/mysql/mysql_error.log
-
-// To enable general query log add following
-
-general_log_file        = /var/log/mysql/mysql.log
-general_log             = 1
-
-// To enable Slow Query Log add following
-
-log_slow_queries       = /var/log/mysql/mysql-slow.log
-long_query_time = 2
-log-queries-not-using-indexes
-
-
-BACKUPS:
-
-innobackupex  --stream=tar ./| lz4 | ssh upload@backup1  \
-  "cat - > /ssd0/upload/sql/mysql_backup.tar.lz4"
-
-
-EXAMPLES:
-
-
-
-
-
-
-
-// Get size of MySQL databases:
-
-mysql> SELECT table_schema "mydb",
-        ROUND(SUM(data_length + index_length) / 1024 / 1024, 1) "DB Size in MB"
-FROM information_schema.tables
-GROUP BY table_schema;
-
-// Get the size of the specific table in MySQL:
-
-mysql> SELECT
-    table_name AS `Table`,
-    round(((data_length + index_length) / 1024 / 1024), 2) `Size in MB`
-FROM information_schema.TABLES
-WHERE table_schema = ‘db_name’
-    AND table_name = ‘table_name’;
-
-// Get the size of all tables, descending order:
-
-mysql> SELECT
-     table_schema as `Database`,
-     table_name AS `Table`,
-     round(((data_length + index_length) / 1024 / 1024), 2) `Size in MB`
-FROM information_schema.TABLES
-ORDER BY (data_length + index_length) DESC;
-
-
-// Drop multiple databases;
-
-#!/bin/bash
-
-DB_TO_DROP=`mysql -s -e "show databases;" |grep "somedb_"`
-for db in $DB_TO_DROP; do
-    echo "DROPPING: $db"
-    #mysql -s -e "DROP DATABASE $db;"
-done