How to Change Storage Engines and What Are They? InnoDB vs MyISAM
What Are Storage Engines?
A storage engine in MySQL is the underlying component that determines how data is stored, managed, indexed, locked, and retrieved. When a table is created, MySQL uses the chosen engine’s rules and structure to handle its data.
Key responsibilities of a storage engine include:
- Storing and retrieving data
- Managing indexes
- Handling locks and concurrency
- Supporting or not supporting transactions
- Enforcing relationships and data integrity
InnoDB vs. MyISAM — Why InnoDB Is Preferred
MyISAM (Legacy Storage Engine)
MyISAM was the default engine in older MySQL versions. It is simple and works well for basic or read-heavy operations.
Advantages:
- Fast for read-heavy databases
- Lightweight structure
Limitations:
- Does not support ACID transactions
- No foreign key constraints
- Uses table-level locking, meaning the entire table locks during a write
- More prone to corruption during unexpected shutdowns
InnoDB (Modern Default Storage Engine)
Primary Advantage: Row-Level Locking
The most important performance feature of InnoDB is its row-level locking capability. Row-level locking means that only the specific rows being modified are locked, instead of locking the entire table. This dramatically improves performance under heavy load, especially for websites that perform many write operations.
This allows:
- Higher concurrency
- Faster response times
- Improved stability during peak traffic
Additional Benefits of InnoDB:
- Supports ACID transactions
- Crash recovery mechanisms
- Supports foreign key constraints
- Efficient caching and indexing systems
How to Change Storage Engine in cPanel (Using phpMyAdmin)
It is advisable to make a full backup before continuing, just in case something goes wrong.
Step 1: Log in to cPanel
- Access your cPanel URL (e.g., https://yourdomain.com:2083)
- Log in with your username and password
- Alternatively, with an elastic hosting plan, log in via your client account:
- Go to manage.fullhost.com and log in to your account
- Click on "services"
- Click the hosting plan which has the website in question
- On the left there is an "Actions" menu. Click "Log in to cPanel"
Step 2: Open phpMyAdmin
- Go to the Databases section
- Click phpMyAdmin
Step 3: Select the Database
- In the left navigation, click the database containing the table you want to convert
Step 4: Confirm Storage Engine Type
- In the table list, check the Engine column
- Look for tables currently using MyISAM
Step 5: Convert a Table to InnoDB (Using the Operations Tab)
- Click the table name
- Go to the Operations tab
- Scroll to Table Options
- In the Storage Engine dropdown, select InnoDB
- Click Go
Step 6: Verify Conversion
- Refresh the table list
- Ensure the Engine column now shows InnoDB
