Using Dbsake To Recover Table Structure From .frm Files And Process Mysqldump Output

How to Use dbsake to Recover MySQL Table Structures from .frm Files and Process mysqldump Output

If you have ever faced a situation where you need to recover MySQL table structures from .frm files or process mysqldump output, you know how challenging it can be. Fortunately, there is a tool that can make your life easier: dbsake.

dbsake is a collection of command-line tools that perform various DBA-related tasks for MySQL. In this article, we will show you how to use two of its commands: frmdump and mysqldump-filter.

Recovering MySQL Table Structures from .frm Files with dbsake

A .frm file is a file that contains the metadata of a MySQL table or view, such as the column names, types, indexes, etc. Sometimes, you may need to recover the table structure from a .frm file, for example, when you don't have a backup or when the data directory is corrupted.

To recover the table structure from a .frm file using dbsake, you need to use the dbsake frmdump command, followed by the path of the .frm file. This command will decode the .frm file and output a CREATE TABLE or CREATE VIEW statement that you can use to recreate the table or view.

The advantage of using dbsake frmdump is that it does not require a running MySQL server instance and it interprets the .frm file according to rules similar to the MySQL server. It also retrieves the character set and collation information from the .frm file, as well as the MySQL version that created it.

However, there are some limitations of using dbsake frmdump. It cannot recover InnoDB foreign-key references and AUTO_INCREMENT values, as these are stored outside of the .frm file. It also cannot recover triggers, stored procedures, functions, or events, as these are stored in separate files.

Here is an example of using dbsake frmdump to recover the table structure from a .frm file:

# ./dbsake frmdump /var/lib/mysql/sakila/staff.frm

-- Table structure for table `staff`

-- Created with MySQL Version 5.6.27

CREATE TABLE `staff` (

`staff_id` tinyint(3) unsigned NOT NULL AUTO_INCREMENT,

`first_name` varchar(45) NOT NULL,

`last_name` varchar(45) NOT NULL,

`address_id` smallint(5) unsigned NOT NULL,

`picture` blob,

`email` varchar(50) DEFAULT NULL,

`store_id` tinyint(3) unsigned NOT NULL,

`active` tinyint(1) NOT NULL DEFAULT '1',

`username` varchar(16) NOT NULL,

`password` varchar(40) CHARACTER SET utf8 COLLATE utf8_bin DEFAULT NULL,

`last_update` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,

PRIMARY KEY (`staff_id`),

KEY `idx_fk_store_id` (`store_id`),

KEY `idx_fk_address_id` (`address_id`)

) ENGINE=InnoDB DEFAULT CHARSET=utf8;

Processing mysqldump Output with dbsake

A mysqldump file is a file that contains SQL statements to create and populate MySQL tables. Sometimes, you may need to process mysqldump output, for example, when you want to filter out some tables or data, or when you want to transform the output in some way.

To process mysqldump output using dbsake, you need to use the dbsake mysqldump-filter command, followed by some options and filters. This command will read the mysqldump output from standard input and write the filtered or transformed output to standard output.

The advantage of using dbsake mysqldump-filter is that it can handle various types of mysqldump output, such as single-database dumps, multi-database dumps, or all-database dumps. It can also handle different formats of mysqldump output, such as plain SQL statements or XML documents.

The dbsake mysqldump-filter command supports many options and aa16f39245

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Using Dbsake To Recover Table Structure From .frm Files And Process Mysqldump Output