What is Innodb_buffer_pool_chunk_size?
This new feature also introduced a new variable — innodb_buffer_pool_chunk_size — which defines the chunk size by which the buffer pool is enlarged or reduced. … This variable is not dynamic and if it is incorrectly configured, could lead to undesired situations.
What is Innodb_buffer_pool_instances?
The innodb_buffer_pool_instances divides the InnoDB buffer pool in a number of regions. … For systems with buffer pools in the multi-gigabyte range, dividing the buffer pool into separate instances can improve concurrency, by reducing contention as different threads read and write to cached pages.
What is buffer pool size in MySQL?
The InnoDB buffer pool size sets how much memory (RAM) is allocated to MySQL for caching data and indexes. It should be set to as large a value as possible without causing excessive paging by other processes.
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.
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 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.
Does InnoDB improve performance?
MySQL requires significant memory amounts in order to provide optimal performance. By caching hot datasets, indexes, and ongoing changes, InnoDB is able to provide faster response times and utilize disk IO in a much more optimal way. From a CPU standpoint, faster processors with many cores provide better throughput.
What is Query_cache_type in MySQL?
MySQL determines the queries to cache by examining the query_cache_type variable. Setting this value to 0 or OFF prevents caching or retrieval of cached queries. You can also set it to 1 to enable caching for all queries except for ones beginning with the SELECT SQL_NO_CACHE statement.
How does InnoDB check engine status?
SHOW ENGINE INNODB STATUS is a specific form of the SHOW ENGINE statement that displays the InnoDB Monitor output, which is extensive InnoDB information which can be useful in diagnosing problems.
How much RAM does MySQL need?
The default configuration is designed to permit a MySQL server to start on a virtual machine that has approximately 512MB of RAM. You can improve MySQL performance by increasing the values of certain cache and buffer-related system variables.
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 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 should be Innodb_log_file_size?
However, around five minutes per 1GB of innodb_log_file_size is a decent ballpark number. … While a specific log file size might be good enough for smaller innodb_buffer_pool_size, larger InnoDB Buffer Pool values might warrant larger log files for optimal performance.
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_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.