Innodb

Innodb_buffer_pool_size

Innodb_buffer_pool_size
  1. What is the use of innodb_buffer_pool_size?
  2. What is the unit of innodb_buffer_pool_size?
  3. What is innodb_log_file_size?
  4. What is Innodb_online_alter_log_max_size?
  5. What is innodb_buffer_pool_size MariaDB?
  6. How do I know my InnoDB size?
  7. What is Lock_wait_timeout?
  8. How do I check my InnoDB buffer pool?
  9. What is Tmp_table_size in MySQL?
  10. What is Innodb_data_file_path?
  11. What is Innodb_open_files?
  12. What is Innodb_adaptive_hash_index?
  13. What is Innodb_flush_method?
  14. What is Innodb_flush_log_at_trx_commit?
  15. What is Innodb_buffer_pool_instances?

What is the use of innodb_buffer_pool_size?

innodb_buffer_pool_size is the MySQL configuration parameter that specifies the amount of memory allocated to the InnoDB buffer pool by MySQL. This is one of the most important settings in the MySQL hosting configuration and should be configured based on the available system RAM.

What is the unit of innodb_buffer_pool_size?

innodb_buffer_pool_chunk_size is 128M , which is the default value. In this case, 9G is not a multiple of innodb_buffer_pool_instances=16 * innodb_buffer_pool_chunk_size=128M , so innodb_buffer_pool_size is adjusted to 10G , which is a multiple of innodb_buffer_pool_chunk_size * innodb_buffer_pool_instances .

What is innodb_log_file_size?

innodb_log_file_size is the size of a log file (in bytes). There exist multiple log file for MySQL to write the data to. This particular system-variable tells the file size of one of such log files.

What is Innodb_online_alter_log_max_size?

innodb_online_alter_log_max_size — MariaDB Enterprise Documentation. Enterprise Documentation / Reference / Reference for MariaDB Enterprise Server / System Variables for MariaDB Enterprise Server / innodb_online_alter_log_max_size.

What is innodb_buffer_pool_size MariaDB?

innodb_buffer_pool_size. The most important server system variable is innodb_buffer_pool_size. This size should contain most of the active data set of your server so that SQL request can work directly with information in the buffer pool cache.

How do I know my InnoDB size?

The usage of the InnoDB Buffer Pool can be measured with the SHOW GLOBAL STATUS LIKE 'Innodb_buffer_pool_pages_%' command. The sum of data, misc and free pages is equivalent to total pages. And the number of total pages multiplied by Innodb_page_size corresponds to your innodb_buffer_pool_size.

What is Lock_wait_timeout?

A lock wait timeout results when one user gets a lock on some data and holds it while another user tries to access it. If the first user doesn't unlock the data, the second one will time out after a while. The database will respond to the second user with an error message saying their lock wait was too long.

How do I check my InnoDB buffer pool?

The usage of the InnoDB Buffer Pool can be measured with the SHOW GLOBAL STATUS LIKE 'Innodb_buffer_pool_pages_%' command. The sum of data, misc and free pages is equivalent to total pages. And the number of total pages multiplied by Innodb_page_size corresponds to your innodb_buffer_pool_size .

What is Tmp_table_size in MySQL?

Temporary Tables Monitor in Monyog

Displays the value of the tmp_table_size server variable, which defines the maximum size of temporary tables created in memory. Along with the max_heap_table_size, this size defines the maximum size of an internal table that can be created in memory.

What is Innodb_data_file_path?

By default, a single system tablespace data file, named ibdata1 , is created in the data directory. The size and number of system tablespace data files is defined by the innodb_data_file_path startup option. For configuration information, see System Tablespace Data File Configuration.

What is Innodb_open_files?

innodb_open_files controls the number of InnoDB files ( . ibd ) the server can keep open at once; whilst table_open_cache controls the number of table definition ( . frm ) files the server can have open at once.

What is Innodb_adaptive_hash_index?

The adaptive hash index is enabled by the innodb_adaptive_hash_index variable, or turned off at server startup by --skip-innodb-adaptive-hash-index . Based on the observed pattern of searches, a hash index is built using a prefix of the index key. ... InnoDB has a mechanism that monitors index searches.

What is Innodb_flush_method?

innodb_flush_method variable specifies how InnoDB opens and flushes log and data files. ... If innodb_flush_method is set to O_DIRECT it'd avoid double buffering and reduce swap pressure and helps improving performance.

What is Innodb_flush_log_at_trx_commit?

Description. InnoDB will regularly flush logs to the disk. ... If innodb_flush_log_at_trx_commit is set to 0, the log buffer is written out to the log file once per second and the flush to disk operation is performed on the log file. However, nothing is done at a transaction commit.

What is Innodb_buffer_pool_instances?

Innodb_buffer_pool_instances = 64 is the maximum value allowed by MySQL.

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