Innodb_log_buffer_size

1. What is Innodb_log_buffer_size?
2. What is Innodb_online_alter_log_max_size?
3. What is Innodb_read_io_threads?
4. What is Innodb_page_size?
5. What is Innodb_max_dirty_pages_pct?
6. What is the use of innodb_log_file_size?
7. What is Innodb_data_file_path?
8. What is Innodb_adaptive_hash_index?
9. What is Innodb_flush_method?
10. What is Innodb_flush_log_at_trx_commit?
11. What is Innodb_open_files?
12. What is innodb_buffer_pool_size?
13. What is Log_bin_trust_function_creators?
14. What is Innodb_buffer_pool_instances?
15. What is Innodb_strict_mode?

What is Innodb_log_buffer_size?

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_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_read_io_threads?

innodb_read_io_threads. The number of I/O threads for read operations in InnoDB. The default value is 4. innodb_write_io_threads. The number of I/O threads for write operations in InnoDB.

What is Innodb_page_size?

The InnoDB Buffer Pool is the memory area where the InnoDB Storage Engine caches its data and index blocks. Each InnoDB data and index block has a size of Innodb_page_size (16384 byte = 16 kbyte). ... The sum of data, misc and free pages is equivalent to total pages.

What is Innodb_max_dirty_pages_pct?

mysql innodb transaction-log buffer-pool data-pages. I'm puzzled by the innodb_max_dirty_pages_pct parameter, and its relation to the redo log. The definition itself is simple: InnoDB tries to flush data from the buffer pool so that the percentage of dirty pages does not exceed this value.

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_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_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_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_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 Log_bin_trust_function_creators?

By default, this variable has a value of 0, but you can change it like this: mysql> SET GLOBAL log_bin_trust_function_creators = 1; You can also set this variable at server startup. If binary logging is not enabled, log_bin_trust_function_creators does not apply.

What is Innodb_buffer_pool_instances?

Innodb_buffer_pool_instances = 64 is the maximum value allowed by MySQL.

What is Innodb_strict_mode?

InnoDB strict mode can be enabled or disabled by configuring the innodb_strict_mode server system variable. Its global value can be changed dynamically with SET GLOBAL . For example: SET GLOBAL innodb_strict_mode=ON; Its value for the current session can also be changed dynamically with SET SESSION .