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https://dev.mysql.com/gis-class-multicurve.html
A MultiCurve is simple if and only if all of its elements are simple; the only intersections between any two elements occur at points that are on the boundaries of both elements. A MultiCurve boundary is obtained by applying the “mod 2 union ... A ...
https://dev.mysql.com/gis-class-multipolygon.html
A MultiPolygon has no two Polygon elements that cross (crossing is also forbidden by the previous assertion), or that touch at an infinite number of points. A MultiPolygon is a MultiSurface object composed of Polygon elements. MultiPolygon Examples ...
https://dev.mysql.com/gis-class-polygon.html
The rings in the boundary of a Polygon may intersect at a Point, but only as a tangent. A Polygon has an interior that is a connected point set. A Polygon is a planar Surface representing a multisided geometry. It is defined by a single exterior ...
https://dev.mysql.com/group-replication-configuring-consistency-guarantees.html
Although the Transaction Synchronization Points section explains that conceptually there are two synchronization points from which you can choose: on read or on write, these terms were a simplification and the terms used in Group Replication are: ...The consistency level can have a different impact on read-only (RO) and read-write (RW) transactions processed by the group as demonstrated in this ...
https://dev.mysql.com/group-replication-configuring-instances.html
At this point the option file ensures that the server is configured and is instructed to instantiate the replication infrastructure under a given configuration. Warning When joining multiple servers at the same time, make sure that they point to ...
https://dev.mysql.com/group-replication-enterprise-backup.html
For example: s3> rm -rf /var/lib/mysql/* If the system variables innodb_data_home_dir, innodb_log_group_home_dir, and innodb_undo_directory point to any directories other than the data directory, they should also be made empty; otherwise, the ...
https://dev.mysql.com/group-replication-options.html
Group Replication's Group Communication System (GCS) is not available to validate the values until that point. From the point where the server running the lower version joins the group, stop all writes on the other servers in the group. This ...
https://dev.mysql.com/innodb-change-buffer.html
The INFORMATION_SCHEMA.INNODB_METRICS table provides most of the data points found in InnoDB Standard Monitor output, plus other data points. The change buffer is a special data structure that caches changes to secondary index pages when those ...
https://dev.mysql.com/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 of time, and no changes made by later or ...The exception to this rule is that the query sees the changes made by earlier statements within the same ...
https://dev.mysql.com/innodb-fulltext-index.html
This process, even for small documents, could result in numerous small insertions into the auxiliary index tables, making concurrent access to these tables a point of contention. Deleting a record that has a full-text index column could result in ...
Document created the 26/06/2006, last modified the 26/10/2018
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