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How do you maintain a MySQL database?

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How do you maintain a MySQL database?

  1. Maintain Table.
  2. Analyze Tables. Analyze and store the key distribution for the table.
  3. Check Tables. Check a table or tables for errors.
  4. Optimize Tables. The main reason for optimizing your table is to reclaim unused space and to defragment the data file.
  5. Repair Tables.
  6. Get Rows Count.

How do I fix InnoDB corruption?

How to Repair Corrupt InnoDB Table in MySQL?

  1. Fix Corrupted InnoDB Table Manually.
  2. Step 1: Restart the MySQL Service.
  3. Step 2: Force InnoDB Recovery.
  4. Step 3: Drop the Corrupt Table.
  5. Step 4: Restore the Table.
  6. Step 5: Restart MySQL in Normal Mode.

How do I know if my MySQL database is corrupted?

You can find this information in the error log or in information_schema. mysql> select table_name,engine from information_schema. tables where table_name = ‘

‘ and table_schema = ” ; The main tools/commands to diagnose issues with data corruption are CHECK TABLE, REPAIR TABLE, and myisamchk.

How do I restore my InnoDB database?

To manually recover your InnoDB tables, you need to follow the below listed steps:

  1. Step 1: Bring up your database in recovery mode.
  2. Step 2: Check which tables are corrupted.
  3. Step 3: Backup and drop your corrupted tables.
  4. Step 4: Restart MySQL in normal mode.
  5. Step 5: Import backup .sql.
  6. Step 6: Change port.

What is table maintenance in MySQL?

Table maintenance operations are useful for identifying and correcting database problems such as the following: – Tables that become damaged as a result of a server crash. Many tools are available for performing table maintenance: MySQL Workbench. MySQL Enterprise Monitor.

What causes InnoDB corruption?

Most InnoDB corruptions are hardware-related. Corrupted page writes can be caused by power failures or bad memory. The issue also can be caused by using network-attached storage (NAS) and allocating InnoDB databases on it.

How do I rebuild ibdata1?

As you want to reclaim the space from ibdata1 you actually have to delete the file:

  1. Do a mysqldump of all databases, procedures, triggers etc except the mysql and performance_schema databases.
  2. Drop all databases except the above 2 databases.
  3. Stop mysql.
  4. Delete ibdata1 and ib_log files.
  5. Start mysql.
  6. Restore from dump.

How do you maintain a database?

Tips on maintaining your database

  1. Keep all data in one central file or program.
  2. Provide insight into your data by using clear descriptive names, tabs and definitions of data.
  3. Keep your database complete by adding new information directly.
  4. Keep your database up-to-date.

What optimize table does in mysql?

OPTIMIZE TABLE reorganizes the physical storage of table data and associated index data, to reduce storage space and improve I/O efficiency when accessing the table. The exact changes made to each table depend on the storage engine used by that table.

How do I optimize a mySQL table with InnoDB?

With InnoDB it basically runs an ALTER TABLE statement that changes nothing but tells MySQL to rebuild the table and its indexes. To optimize a single table: To optimize all tables in a database, from command line: If you get “Table does not support optimize, doing recreate + analyze instead”, that is normal for InnoDB.

What is the use of InnoDB_dictionaries in MySQL?

This parameter is ON by default in MySQL 5.6 and higher. This parameter relieves you of management issues relating to InnoDB tables by storing them in separate files and avoiding bloated main dictionaries and system tables. Enabling this variable also avoids from facing data recovery complexity when a certain table is corrupted

What does InnoDB_buffer_pool_size do?

The more innodb_buffer_pool_size you can give to MySQL, the more tablespace it can load into RAM. The aforementioned will do ALL Retain tables; however, many are static and would not necessarily be subject to fragmentation issues; thus, you can paste the following query into the MySQL prompt after logging into MySQL.

What are the advantages of InnoDB?

This storage engine is known as a high-reliability and a high-performance storage engine and its key advantages include supporting row-level locking, foreign keys and following the ACID model. InnoDB replaces MyISAM as the default storage engine since MySQL 5.5, which was released in 2010.

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