Mysql Drop All Tables
Situation: I have a MySQL database with 104 tables, running locally on XAMPP on windows 7. All the tables have InnoDB engine. XAMPP MySQL is running as windows service. As front end I have PHP (CodeIgniter).Problem: Last night as usual I stopped working on the project and shutdown the windows normally. Today in the morning I got error table MYTALBE does not exists in the browser.
Show tables on console shows the table name, but desc MYTABLE and select. from MYTABLE says unknown table. I tried create table MYTABLE(.) but I had error as table MYTABLE already exists, so I tried drop table MYTABLE but it said Unknown table MYTABLE! I tried mysqlcheck.exe for repair and check, they failed both, but after that, show tables does not show the table name any longer. I need to mention I did not change/move/delete/rename any of mysql files.Question: Is it possible to recover/repair MYTABLE, or at least how to drop and create it again (without dropping the database and re-crteating it again)? This situation sounds a lot like a post I answered two years ago First, here is the InnoDB ArchitectureIn that post, I basically point out that the metadata of the table is still present inside the system tablespace file ibdata1.When you ran SHOW TABLES;, all mysqld did was report the.frm files. It is possible to create the table as MyISAM because it has no attachments to ibdata1 or any other metadata.
Yet, you cannot convert it to InnoDB because the metadata somehow imagines that the.frm and some tablespaceid is attached to the table name. Based on my old post, I would just mysqldump all the other tables and call you table a lost cause. However, for just such an occasion.In saysThe Percona Data Recovery Tool for InnoDB is a free toolkit for recovering lost or corrupted data from InnoDB tables. It provides a way to extract InnoDB's data from files or raw devices in a tab-separated format when standard InnoDB recovery cannot be used for some reason such as a dropped table or severe corruption that prevents InnoDB from recognizing the data.
It can be used for MySQL recovery to retrieve deleted tables, recover previous versions of updated rows, or fix InnoDB file corruption after a hardware failure such as a memory fault or bad cabling.Percona has used these tools to perform MySQL data recovery for many customers, including extremely large datasets. Although the tools are powerful, performing InnoDB data recovery correctly requires expert knowledge of the InnoDB storage format and source code plus experience, and intuition. Percona can help with our data recovery service.I have not used it, but if Percona made it, you should give it a try.If you have a backup of that lost table (in the form of a mysqldump), you should carry out the steps from my old post and then load the backup of the lost table. SUGGESTIONOnce you get this situation squared away, you should tune InnoDB to flush changes to disk. mysqldinnodbfastshutdown=0innodbmaxdirtypagespct=0innodbbufferpooldumpatshutdown=1innodbbufferpoolloadatstartup=1That way, when you shutdown mysql, InnoDB can more thoroughly flush changes.If you want even better assurance of InnoDB being flushed to disk, you should use MySQL in Linux.
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 separately. Another common – but not that clever – practise is it to delete each table by a separate drop command or by list them manually in a drop statement (see ). All at all not that comfortable!That’s why I wrote this MySQL database procedure to drop all tables from MySQL databases. # DROP all TablesDELIMITER //;DROP PROCEDURE IF EXISTS killalltables;CREATE PROCEDURE killalltables(IN dbname VARCHAR(255), OUT tables TEXT)BEGIN# disable foreign key checks to prevent errorsSET FOREIGNKEYCHECKS = 0;SET SESSION groupconcatmaxlen = 20000;# Select all tables from given DatabaseSELECT GROUPCONCAT('`', tableschema, '`.'
, tablename)INTO @tablesToDropFROM informationschema.tablesWHERE tableschema = dbname;SELECT @tablesToDrop;# Append determined table names to DROP TABLE statementSET @dropcommad = NULL;SET @dropcommad = CONCAT('DROP TABLE ', @tablesToDrop);SELECT @dropcommad;# create a mysql command FromPREPARE stmt FROM @dropcommad;EXECUTE stmt;DEALLOCATE PREPARE stmt; # delete it afterwards# reenable foreign key checks againSET FOREIGNKEYCHECKS = 1;END;DELIMITER;CALL killalltables('dbname', @erg);SELECT @erg;DELIMITER. Archives. (1). (2). (2). (1).
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Mysql Drop All Tables Terminal
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Mysql Drop All Tables From Command Line
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