Innodb_buffer_pool_instances

1. What is the use of Innodb_buffer_pool_instances?
2. What is the use of innodb_buffer_pool_size?
3. What is the unit of innodb_buffer_pool_size?
4. What is Innodb_additional_mem_pool_size?
5. How can I improve my InnoDB performance?
6. How do I know my InnoDB size?
7. What is the use of innodb_log_file_size?
8. What is innodb_buffer_pool_size MariaDB?
9. How do I check my InnoDB buffer pool?
10. What is Innodb_file_per_table?
11. How much RAM does MySQL use?
12. What is Join_buffer_size?
13. What is Innodb_data_file_path?
14. What is Innodb_adaptive_hash_index?
15. What is Innodb_flush_log_at_trx_commit?

What is the use of Innodb_buffer_pool_instances?

The innodb_buffer_pool_instances divides the InnoDB buffer pool into separate instances. Dividing your buffer pool into separate instances can improve concurrency, by reducing contention as different threads read and write to cached pages.

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_additional_mem_pool_size?

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

How can I improve my InnoDB 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.

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 the use of 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_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 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 Innodb_file_per_table?

InnoDB creates tables in file-per-table tablespaces by default. This behavior is controlled by the innodb_file_per_table variable. Disabling innodb_file_per_table causes InnoDB to create tables in the system tablespace. ... innodb_file_per_table is enabled by default in MySQL 5.6 and higher.

How much RAM does MySQL use?

MySQL allocates buffers and caches to improve performance of database operations. The default configuration is designed to permit a MySQL server to start on a virtual machine that has approximately 512MB of RAM.

What is Join_buffer_size?

From MySQL's documentation the join_buffer_size is described as: “The minimum size of the buffer that is used for plain index scans, range index scans, and joins that do not use indexes and thus perform full table scans.” It goes on to say: “Memory allocation time can cause substantial performance drops if the global ...

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_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_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.