Search Results
https://dev.mysql.com/doc/refman/8.4/en/innodb-consistent-read.html
A consistent read means that InnoDB uses multi-versioning to present to a query a snapshot of the database at a point in time. The query sees the changes made by transactions that committed before that point in time, and no changes made by later or ...
https://dev.mysql.com/doc/refman/8.4/en/innodb-deadlocks-handling.html
Another way to serialize transactions is to create an auxiliary “semaphore” table that contains just a single row. This section builds on the conceptual information about deadlocks in Section 17.7.5.2, “Deadlock Detection”. It explains how ...
https://dev.mysql.com/doc/refman/8.4/en/innodb-disk-io.html
InnoDB uses asynchronous disk I/O where possible, by creating a number of threads to handle I/O operations, while permitting other database operations to proceed while the I/O is still in progress. On Linux and Windows platforms, InnoDB uses the ...
https://dev.mysql.com/doc/refman/8.4/en/innodb-enabling-monitors.html
When this option is used, InnoDB creates a file named innodb_status.pid in the data directory and writes output to it every 15 seconds, approximately. When InnoDB monitors are enabled for periodic output, InnoDB writes the output to mysqld server ...
https://dev.mysql.com/doc/refman/8.4/en/innodb-limits.html
If you reduce the InnoDB page size to 8KB or 4KB by specifying the innodb_page_size option when creating the MySQL instance, the maximum length of the index key is lowered proportionally, based on the limit of 3072 bytes for a 16KB page size. This ...
https://dev.mysql.com/doc/refman/8.4/en/innodb-online-ddl-single-multi.html
Before the introduction of online DDL, it was common practice to combine many DDL operations into a single ALTER TABLE statement. Because each ALTER TABLE statement involved copying and rebuilding the table, it was more efficient to make several ...
https://dev.mysql.com/doc/refman/8.4/en/innodb-performance-optimizer-statistics.html
You can use the STATS_PERSISTENT, STATS_AUTO_RECALC, and STATS_SAMPLE_PAGES clauses with CREATE TABLE and ALTER TABLE statements to configure optimizer statistics for individual tables. This section describes how to configure persistent and ...
https://dev.mysql.com/doc/refman/8.4/en/innodb-physical-structure.html
InnoDB performs a bulk load when creating or rebuilding B-tree indexes. This method of index creation is known as a sorted index build. With the exception of spatial indexes, InnoDB indexes are B-tree data structures. Spatial indexes use R-trees, ...
https://dev.mysql.com/doc/refman/8.4/en/innodb-recovery.html
In some cases of database corruption, it is enough to dump, drop, and re-create one or a few corrupt tables. To achieve point-in-time recovery after restoring a backup, you can apply changes from the binary log that occurred after the backup was ...
https://dev.mysql.com/doc/refman/8.4/en/innodb-table-compression.html
Table compression is enabled using the ROW_FORMAT=COMPRESSED attribute with CREATE TABLE or ALTER TABLE. This section describes InnoDB table compression, which is supported with InnoDB tables that reside in file_per_table tablespaces or general ...