Count tables MYSQL
Count tables within a DB, nice and easy..
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use db_name; select count(*) from information_schema.tables where table_schema = database(); |
Category: SQL
Group data in MySQL every N hours
Using the hour to aggregate.. in this example every 3 hours.
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select * from tbl_sometable group by floor(hour(time) / 3); |
MYSQL Dump Single Table
Dumping Single MYSQL Table
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mysqldump db_name table_name > table_name.sql mysqldump -u -h -p db_name table_name > table_name.sql mysqldump -u -h -p db_name table_name --events --triggers --routines > table_name.sql |
Extract Table from SQL Dump – MYSQL
The script below creates individual table exports from a SQL dump.
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./MyDumpSplitter.sh yourfile.sql your_table_name |
[code] #!/bin/sh # http://kedar.nitty-witty.com #SPLIT DUMP FILE INTO INDIVIDUAL TABLE DUMPS # Text color variables txtund=$(tput sgr 0 1) # Underline txtbld=$(tput bold) # Bold txtred=$(tput setaf 1) # Red txtgrn=$(tput setaf 2) # Green txtylw=$(tput setaf 3) # Yellow txtblu=$(tput setaf 4) […]
MYSQL Event Scheduler – Auto Enable
If you are finding the MYSQL event scheduler is disabled everytime you start MYSQL, use the following my.cnf or mysql.ini settings; event_scheduler=on That Simple!!
2002 Cannot log in to the MySQL server – MAC
To fix In /etc/php.ini, replaced the three occurences of /var/mysql/mysql.sock with /tmp/mysql.sock prompt% sudo chmod u+w php.ini <- had to give myself write permission to that file.. you may need to become root user to actually edit the file.. depends who owns php.ini Now edit it.. i vi find: pdo_mysql.default_socket=/var/mysql/mysql.sock change to: pdo_mysql.default_socket=/tmp/mysql.sock Find: mysql.default_socket[…]
Reset MYSQL root password – Linux
Log on to your Linux machine as the root user. The steps involved in resetting the MySQL root password are to stop the MySQL server, restart it without the permissions active so you can log into MySQL as root without a password, set a new password, and then restart it normally. Here‚Äôs how you do[…]
SQL Where values are not in another table
[sql] select TCode from Tracking where not exists (select * from Task where Task.TCode = Tracking.TCode ) [/sql]
Select next available ID
## Select the next available UID ## Do not delete users from unixuid and unix gid as there id’s may get re-used ######################################## [sql] SELECT min( r1.uid ) +1 AS next_available_uid FROM unixuid AS r1 LEFT OUTER JOIN unixuid AS r2 ON r2.uid = r1.uid +1 WHERE r1.uid >200 AND r2.uid IS NULL”; [/sql]
MYSQL – Replication
Login to your mysql server: mysql -uBla -p Some useful commands
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SHOW SLAVE STATUS; SHOW MASTER STATUS; SHOW PROCESSLIST ; SHOW SLAVE HOSTS; |