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https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-ndbinfo-memory-per-fragment.html
Ordered index fragments are T-tree structures which maintain a balanced tree containing row references in the order implied by the indexed columns. Since the tree contains references rather than actual data, the T-tree storage cost is not dependent ... memory_per_fragment Table: Notes memory_per_fragment Table: Examples The memory_per_fragment table provides information about the usage of memory by individual ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-physical-structure.html
With the exception of spatial indexes, InnoDB indexes are B-tree data structures. Spatial indexes use R-trees, which are specialized data structures for indexing multi-dimensional data. Index records are stored in the leaf pages of their B-tree or ...The page size is determined by the innodb_page_size setting when the MySQL instance is ...
https://dev.mysql.com/doc/refman/8.0/en/hash-joins.html
In MySQL 8.0.20 and later, the hash join is used in such cases, as shown here: mysql> EXPLAIN FORMAT=TREE -> SELECT * FROM t1 -> JOIN t2 ON (t1.c1 = t2.c1) -> JOIN t3 ON (t2.c1 < t3.c1)\G *************************** 1. This means that the types of ... By default, MySQL (8.0.18 and later) employs hash joins whenever ...
https://dev.mysql.com/doc/refman/8.0/en/source-configuration-options.html
For information about experimental system variables, refer to /storage/innobase/handler/ha_innodb.cc in the MySQL source tree. -DWITH_AUTHENTICATION_PAM=bool Whether to build the PAM authentication plugin, for source trees that include this plugin.
https://dev.mysql.com/doc/refman/8.0/en/server-system-variables.html
bulk_insert_buffer_size Command-Line Format --bulk-insert-buffer-size=# System Variable bulk_insert_buffer_size Scope Global, Session Dynamic Yes SET_VAR Hint Applies Yes Type Integer Default Value 8388608 Minimum Value 0 Maximum Value (64-bit ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-parameters.html
Normal operations can continue while the hash table is emptied, and executing queries that were using the hash table access the index B-trees directly instead. innodb_fill_factor defines the percentage of space on each B-tree page that is filled ...
https://dev.mysql.com/doc/refman/8.0/en/information-schema-innodb-cmp-table.html
COMPRESS_OPS The number of times a B-tree page of size PAGE_SIZE has been compressed. COMPRESS_OPS_OK The number of times a B-tree page of size PAGE_SIZE has been successfully compressed. COMPRESS_TIME The total time in seconds used for attempts to ... The INNODB_CMP and INNODB_CMP_RESET tables provide status information on operations related to compressed InnoDB ...
https://dev.mysql.com/doc/refman/8.0/en/installing-source-distribution.html
Configure the Distribution Change location into the top-level directory of the unpacked distribution: $> cd mysql-VERSION Build outside of the source tree to keep the tree clean. The minimum configuration command includes no options to override ...
https://dev.mysql.com/doc/refman/8.0/en/memory-storage-engine.html
A common performance issue is using the default hash indexes in workloads where B-tree indexes are more efficient. Indexes The MEMORY storage engine supports both HASH and BTREE indexes. The memory needed for one row in a MEMORY table is calculated ... The MEMORY storage engine (formerly known as HEAP) creates special-purpose tables with contents that are stored in ...
https://dev.mysql.com/doc/refman/8.0/en/myisamchk-table-info.html
Huff tree The number of the Huffman tree associated with the column. The Huff tree and Bits fields are displayed if the table has been compressed with myisampack. To obtain a description of a MyISAM table or statistics about it, use the commands ...