MySQL :: MySQL 8.0 Reference Manual

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25.2.7.6 Unsupported or Missing Features in NDB Cluster

https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-limitations-unsupported.html

See JSON columns and indirect indexing in NDB Cluster, for an example. A number of features supported by other storage engines are not supported for NDB tables. Trying to use any of these features in NDB Cluster does not cause errors in or of ...

25.6.16.4 The ndbinfo blobs Table

https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-ndbinfo-blobs.html

Parts of JSON values exceeding 4000 bytes in size are also stored in this table. For more information about how NDB Cluster stores columns of such types, see String Type Storage Requirements. The part and (NDB 8.0.30 and later) inline sizes of NDB ...

25.2.4 What is New in MySQL NDB Cluster 8.0

https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-what-is-new.html

Replica write batching improves NDB Cluster Replication performance greatly, especially when replicating blob-type columns (TEXT, BLOB, and JSON), and so generally should be enabled whenever using replication with NDB Cluster. The following ...

22.3.3.4 Modify Documents

https://dev.mysql.com/doc/refman/8.0/en/mysql-shell-tutorial-javascript-documents-modify.html

mysql-js> db.countryinfo.modify("Name = 'France'").arrayDelete("$.Airports[1]") Related Information The MySQL Reference Manual provides instructions to help you search for and modify JSON values. You can use the modify() method to update one or ...

22.3.2 Download and Import world_x Database

https://dev.mysql.com/doc/refman/8.0/en/mysql-shell-tutorial-javascript-download.html

The world_x Schema The world_x example schema contains the following JSON collection and relational tables: Collection countryinfo: Information about countries in the world. As part of this quick-start guide, an example schema is provided which is ...

22.4.3.4 Modify Documents

https://dev.mysql.com/doc/refman/8.0/en/mysql-shell-tutorial-python-documents-modify.html

mysql-py> db.countryinfo.modify("Name = 'France'").array_delete("$.Airports[1]") Related Information The MySQL Reference Manual provides instructions to help you search for and modify JSON values. You can use the modify() method to update one or ...

22.4.2 Download and Import world_x Database

https://dev.mysql.com/doc/refman/8.0/en/mysql-shell-tutorial-python-download.html

10.15.8 The optimizer_trace System Variable

https://dev.mysql.com/doc/refman/8.0/en/optimizer-trace-system-variable.html

This renders the trace difficult to read for humans, still usable by JSON parsers, since they ignore whitespace. The optimizer_trace system variable has these on/off switches: enabled: Enables (ON) or disables (OFF) tracing one_line: If set to ON, ...

7.1.9.3 Persisted System Variables

https://dev.mysql.com/doc/refman/8.0/en/persisted-system-variables.html

The MySQL server maintains system variables that configure its operation. A system variable can have a global value that affects server operation as a whole, a session value that affects the current session, or both. Many system variables are ...

10.2.1.2 Range Optimization

https://dev.mysql.com/doc/refman/8.0/en/range-optimization.html

For JSON output, rows_examined_per_scan and rows_produced_per_join do not appear, skip_index_dive_due_to_force is true, and cost calculations are not accurate. The range access method uses a single index to retrieve a subset of table rows that are ...

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