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schema_table_statistics and schema_table_statistics_with_buffer performance #24
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…e TEMPTABLE algorithm to allow the optimizer to add an ad-hoc index like it can on the matialised subqueries.
…iew using the TEMPTABLE algorithm to allow the optimizer to add an ad-hoc index like it can on the matialised subqueries.
…istics and schema_table_statistics_with_buffer
MarkLeith
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…stics_performance schema_table_statistics and schema_table_statistics_with_buffer performance
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By replacing the LEFT JOIN on performance_schema.file_summary_by_instance with a view using the TEMPTABLE algorithm selecting the required data, the optimizer can add an ad-hoc index (auto key) which can greatly improve performance.
Together with the change to the extract_schema_from_file_name() and extract_table_from_file_name() functions so they return a varchar(64), the improvement on my laptop for 100 schemas with 100 tables each is from 14+ minutes to <30 seconds for schema_table_statistics.