https://dev.mysql.com/innodb-performance-optimizer-statistics.html
As a result, different estimates could be produced when recomputing statistics, leading to different choices in execution plans and variations in query performance. This section describes how to configure persistent and non-persistent optimizer ...
https://dev.mysql.com/replication-rbr-safe-unsafe.html
If a large number of such statements were executed on the master, this could lead to excessively large error log files. The “safeness” of a statement in MySQL replication refers to whether the statement and its effects can be replicated ...
https://dev.mysql.com/mysql-cluster-mgm-client-commands.html
mgm#1: PROMPT mymgm > mymgm > PROMPT 'mymgm:' 'mymgm:' PROMPT mymgm: mymgm: PROMPT ndb_mgm> EXIT jon@valhaj:~/bin> Note that leading spaces and spaces within the prompt string are not trimmed. In addition to the central configuration file, a ...
https://dev.mysql.com/replication-rules-examples.html
This can sometimes lead to results that seem counterintuitive, and that may be different depending on whether you are using statement-based or row-based replication; see the text for an example. This section provides additional explanation and ...
https://dev.mysql.com/window-functions-frames.html
The definition of a window used with a window function can include a frame clause. A frame is a subset of the current partition and the frame clause specifies how to define the subset. Frames are determined with respect to the current row, which ...
https://dev.mysql.com/window-functions-usage.html
For these, the OVER clause is mandatory: CUME_DIST() DENSE_RANK() FIRST_VALUE() LAG() LAST_VALUE() LEAD() NTH_VALUE() NTILE() PERCENT_RANK() RANK() ROW_NUMBER() For details about each nonaggregate function, see Section 12.21.1, “Window Function ...
https://dev.mysql.com/innodb-statistics-estimation.html
The default number of sampled pages is 8, which could be insufficient to produce an accurate estimate, leading to poor index choices by the query optimizer. Optimizer statistics are not persisted to disk when innodb_stats_persistent=OFF or when ...
https://dev.mysql.com/replication-solutions.html
See Section 17.3.6, “Replicating Different Databases to Different Slaves” As the number of replication slaves increases, the load on the master can increase and lead to reduced performance (because of the need to replicate the binary log to each ... Replication can be used in many different environments for a range of ...
https://dev.mysql.com/partitioning-types.html
When you specify the number of partitions for the table, this must be expressed as a positive, nonzero integer literal with no leading zeros, and may not be an expression such as 0.8E+01 or 6-2, even if it evaluates to an integer value. This ...
https://dev.mysql.com/partitioning.html
Mikael Ronström's Blog MySQL Partitioning Architect and Lead Developer Mikael Ronström frequently posts articles here concerning his work with MySQL Partitioning and NDB Cluster. Note Table partitioning differs from partitioning as used by window ...
