Innodb

Innodb_io_capacity ssd

Innodb_io_capacity ssd
  1. What is Innodb_stats_persistent_sample_pages?
  2. What is Innodb_log_files_in_group?
  3. What is Innodb_write_io_threads?
  4. What is Innodb_buffer_pool_instances?
  5. What is Innodb_log_buffer_size?
  6. What is Innodb_strict_mode?
  7. What is Innodb_buffer_pool_size used for?
  8. What is Innodb_adaptive_hash_index?
  9. What is Innodb_max_dirty_pages_pct?
  10. What is Innodb_flush_method?
  11. What is Innodb_data_file_path?
  12. Does InnoDB improve performance?
  13. What is Query_cache_limit?
  14. How do I increase InnoDB buffer?
  15. What is Innodb_file_per_table?

What is Innodb_stats_persistent_sample_pages?

innodb_stats_persistent_sample_pages. It is used for number of index pages to sample when estimating cardinality and other statistics for an indexed column.

What is Innodb_log_files_in_group?

innodb_buffer_pool_size is the amount of memory to use to cache tables, indexes and a few other things. This is the main tunable and you will want to set it quite high for performance reasons - there are plenty of resources discussing this.

What is Innodb_write_io_threads?

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

What is Innodb_buffer_pool_instances?

Innodb_buffer_pool_instances = 64 is the maximum value allowed by MySQL.

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_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 .

What is Innodb_buffer_pool_size used for?

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 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_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 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_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.

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_limit?

The query_cache_limit value determines the maximum size of individual query results that can be cached. The default value is 1,048,576 bytes and this is equivalent to 1MB. MySQL does not handle cached data in one big chunk; instead it is handled in blocks.

How do I increase InnoDB buffer?

Configuring InnoDB Buffer Pool Chunk Size

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.

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.

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