MySQL 8.0.31 introduces a new syntax that allows importing pre‑computed histogram data directly into a table, dramatically reducing the time needed to update histogram statistics compared with the traditional online creation method.
MySQL 8.0's histogram feature provides column value distribution statistics that help the optimizer choose better execution plans, and the article demonstrates how to create, view, and leverage histograms to significantly reduce query costs for range predicates.
This article explains the fundamentals of relational optimization, the role of the optimizer, how CPU and I/O costs are estimated, and why accurate database statistics are essential for effective SQL performance tuning.
This article explains the fundamentals of relational optimization, the role of the cost‑based optimizer, how CPU and I/O costs are estimated, and why accurate database statistics are essential for generating efficient SQL access paths and improving overall query performance.
This article explains Oracle's dynamic sampling feature, outlines typical scenarios such as temporary tables and complex filters, presents real CRM case studies with misestimated cardinalities, demonstrates step‑by‑step solutions using DBMS_STATS commands, and shows how 12c enhancements dramatically improve estimation accuracy for complex queries.
