Recently I had the challenge, that the MySQL database of one of the Magento shops I maintain wasn’t accessible directly through the Net. The access was restricted to the Webserver only. So I had to tunnel MySQL through SSH. And that worked like that: edit the ssh config (~/.ssh/config) on the remote Webserver Host * […]
To save time and because it’s not that smart to repeatedly retype the same things multiple times, you can user custom variables in MySQL like that: SET @store := 1, @name_id := 71, @short_desc_id := 72, @desc_id := 73; SELECT CPE.sku AS sku, CPEVN.value AS name, CPEVSD.value AS short_description, CPEVD.value AS description FROM catalog_product_entity AS […]
From time to time I stumbled over the case, that I had to drop all tables from a MySQL database. In phpMyAdmin or other GUI-based tools – in general – you only have the possibility to drop the whole database. But then you have to recreate it from the scratch.  Or you have to click-drop each table […]
Today I wanted to test a tiny shell script, that didn’t do such magic stuff. It only generates a few websites, stores and storeviews and associates approximately 200 products to 4 websites. When I ran it locally I had no problems at all. But on the staging server I got the following error message when […]
This little tutorial shows how to dump wildcard selected tables from a MySQL database. That’s useful if you don’t want to dump the whole database. Background Recently I had to export a few selected tables from a very huge database. For that I could have run a query like that to export only the required […]
Sometimes Magento indexes hang up unexpectedly. They are shown as running in Magento backend but looking at the process status (@see https://www.ask-sheldon.com/list-processes-after-cpu-usage/), you recognize that the respective process doesn’t do anything. Other common problems are, that there are payment transactions failures when price index is running (catalog_product_price @see http://magento.stackexchange.com/questions/260/price-re-index-causes-db-deadlocks-during-checkout) or that the search doesn’t work properly, […]
It is possible to Simulate a MySQL query before running it with the use of  MySQL-Transactions and the build in ROLLBACK-Feature of MySQL: For example: START TRANSACTION; SELECT * FROM nicetable WHERE somthing=1; UPDATE nicetable SET nicefield=’VALUE’ WHERE somthing=1; SELECT * FROM nicetable WHERE somthing=1; #check COMMIT; # or if you want to reset changes ROLLBACK; […]
You can use the following query to get all duplicated records of a MySQL table having equal values for the respective field: SELECT fieldname, COUNT(*) FROM tablename GROUP BY fieldname HAVING COUNT(*) > 1 This query will give you a list of all the entries having the same value for fieldname. It also will show […]
Sometimes it is really useful to know how large a certain database table has become. With the following SQL statement you get a list of all tables of the currently connected database with their rounded size in MB: SELECT table_name AS “Table”, round(((data_length + index_length) / 1024 / 1024), 2) “Size in MB” FROM information_schema.TABLES […]
To get information about the currently connected user and more MySQLÂ status information, you can call the following command if you are already logged in: mysql> STATUS; This will give you an output like that: ————– mysql Ver 14.14 Distrib 5.1.73, for redhat-linux-gnu (x86_64) using readline 5.1 Connection id: 1044395 Current database: Current user: niceguy@localhost SSL: […]
