How do I set an InnoDB variable?
To change the number or size of InnoDB log files, perform the following steps:
- Stop the MySQL server and make sure that it shuts down without errors.
- Edit my. cnf to change the log file configuration. To change the log file size, configure innodb_log_file_size.
- Start the MySQL server again.
How do I change the InnoDB log size?
Answer
- Connect to a Plesk server via SSH.
- Stop the MySQL service.
- Open the MySQL configuration file my.cnf in a text editor.
- Under the [mysqld] section, change the innodb_log_file_size value according to your needs (the default value is 48M):
- Move the redo log files ib_logfile0 and ib_logfile1 to another directory.
What is Innodb_stats_persistent_sample_pages?
innodb_stats_persistent_sample_pages. It is used for number of index pages to sample when estimating cardinality and other statistics for an indexed column. — Default value is 20. innodb_stats_persistent_sample_pages=20.
What is Innodb_log_buffer_size in MySQL?
The MySQL InnoDB log buffer allows transactions to run without having to write the log to disk before the transactions commit. The size of this buffer is configured with the innodb_log_buffer_size variable. Sensible values range from 1 MB to 8 MB. The default is 1 MB. The minimum value is 256 kB.
What is Innodb_thread_concurrency in MySQL?
innodb_thread_concurrency is variable which set this count, and there are two friendly variables. innodb_thread_sleep_delay and innodb_concurrency_tickets. I’ll try to explain how it works. MySQL has pluginable architecture which divides work between mysql common code. (parser, optimizer) and storage engine.
What is Barracuda MySQL?
Barracuda is the newest file format. It supports all InnoDB row formats including the newer COMPRESSED and DYNAMIC row formats.
Which is advantage of InnoDB?
Key Advantages of InnoDB
| Feature | Support |
|---|---|
| Data caches | Yes |
| Encrypted data | Yes (Implemented in the server via encryption functions; In MySQL 5.7 and later, data-at-rest encryption is supported.) |
| Foreign key support | Yes |
| Full-text search indexes | Yes (Support for FULLTEXT indexes is available in MySQL 5.6 and later.) |
What is InnoDB log file?
InnoDB creates two 5MB redo log files named ib_logfile0 and ib_logfile1 in the data directory by default. The following options can be used to modify the default configuration: innodb_log_group_home_dir defines directory path to the InnoDB log files.
How do I tune a MySQL database for best performance?
System MySQL Performance Tuning
- Balance the Four Main Hardware Resources. Storage.
- Use InnoDB, Not MyISAM.
- Use the Latest Version of MySQL.
- Consider Using an Automatic Performance Improvement Tool.
- Optimize Queries.
- Use Indexes Where Appropriate.
- Functions in Predicates.
- Avoid % Wildcard in a Predicate.
What value is best for Innodb_thread_concurrency?
innodb_thread_concurrency. With improvements to the InnoDB engine, it is recommended to allow the engine to control the concurrency by keeping it to default value (which is zero). If you see concurrency issues, you can tune this variable. A recommended value is 2 times the number of CPUs plus the number of disks.
What is a buffer pool?
An SQL Server buffer pool, also called an SQL Server buffer cache, is a place in system memory that is used for caching table and index data pages as they are modified or read from disk. The primary purpose of the SQL buffer pool is to reduce database file I/O and improve the response time for data retrieval.
What is InnoDB in MySQL?
In MySQL 5.6, InnoDB is the default MySQL storage engine. Unless you have configured a different default storage engine, issuing a CREATE TABLE statement without an ENGINE clause creates an InnoDB table. InnoDB includes all the features that were part of the InnoDB Plugin for MySQL 5.1, plus new features specific to MySQL 5.5 and higher.
What is included in the InnoDB plugin?
InnoDB includes all the features that were part of the InnoDB Plugin for MySQL 5.1, plus new features specific to MySQL 5.5 and higher. The mysql and INFORMATION_SCHEMA databases that implement some of the MySQL internals still use MyISAM .
How do I disable InnoDB on my server?
Controls loading of the InnoDB storage engine, if the server was compiled with InnoDB support. This option has a tristate format, with possible values of OFF , ON, or FORCE. See Section 5.5.1, “Installing and Uninstalling Plugins” . To disable InnoDB, use –innodb=OFF or –skip-innodb .
What is the default MySQL storage engine?
In MySQL 5.6, InnoDB is the default MySQL storage engine. Unless you have configured a different default storage engine, issuing a CREATE TABLE statement without an ENGINE clause creates an InnoDB table.