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How to change InnoDB buffer size in MySQL?
innodb_buffer_pool_chunk_size can be increased or decreased in 1MB (1048576 byte) units but can only be modified at startup, in a command line string or in a MySQL configuration file. Command line: Configuration file:
What should the InnoDB buffer pool size be?
Change my.cnf – add or increase setting for innodb_buffer_pool_size in the [mysqld] section. Generally 70% of available RAM is a good value. Version 5.7.5 implemented dynamic resizing of innodb_buffer_pool_size.
What should the buffer pool size be in MySQL?
Buffer pool size must always be equal to or a multiple of innodb_buffer_pool_chunk_size * innodb_buffer_pool_instances.
How big should the chunk size be in InnoDB?
Chunk size is defined by the innodb_buffer_pool_chunk_size configuration option, which has a default of 128M. For more information, see Configuring InnoDB Buffer Pool Chunk Size . Buffer pool size must always be equal to or a multiple of innodb_buffer_pool_chunk_size * innodb_buffer_pool_instances . If you configure innodb_buffer_pool_size
What is the default buffer size in MySQL?
In this example, innodb_buffer_pool_size is set to 9G, and innodb_buffer_pool_instances is set to 16 . innodb_buffer_pool_chunk_size is 128M, which is the default value.
When does the buffer pool adjustment occur in MySQL?
The adjustment occurs when the buffer pool is initialized. This behavior is demonstrated in the following example:
How big is the buffer pool in InnoDB?
Your innodb_buffer_pool_size is enormous. You have it set at 20971520000. That’s 19.5135 GB. If you only have 5GB of InnoDB data and indexes, then you should only have about 8GB.
How big should be MySQL’s buffer pool size?
The database runs on a Debian server using SSD disks and I’ve set max connections = 800 which sometimes saturate and grind the server to halt. The average query per second is about 2.5K.
Chunk size is defined by the innodb_buffer_pool_chunk_size configuration option, which has a default of 128M. For more information, see Configuring InnoDB Buffer Pool Chunk Size .
How does MySQL buffer pool improve disk I / O?
Dividing the InnoDB buffer pool into multiple instances improves Disk I/O. By doing so, you run your database and website more efficiently and faster. Here is a little help for you. All for more InnoDB Disk I/O performance on MySQL 5.5+. Tuning MySQL servers is an ever ongoing process.
How to improve InnoDB performance in MySQL 5.5.4?
MariaDB/MySQL 5.5.4 introduces new configuration settings for the InnoDB storage engine. This can greatly improve MySQL’s InnoDB performance, both in read and write operations. One of those settings is innodb_buffer_pool_instances. The innodb_buffer_pool_instances divides the InnoDB buffer pool into separate instances.