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https://dev.mysql.com/doc/refman/8.4/en/derived-condition-pushdown-optimization.html
When a derived table cannot be merged into the outer query (for example, if the derived table uses aggregation), pushing the outer WHERE condition down to the derived table should decrease the number of rows that need to be processed and thus speed ...This includes WHERE conditions having multiple predicates joined with AND, OR, or ...
https://dev.mysql.com/doc/mysql-monitor/8.0/en/performance-advisors-ref.html
This advisor has no configurable thresholds and is used to populate the graphs and tables of the Database File I/O report. Excessive Disk Temporary Table Usage Detected If the space required to build a temporary table exceeds either tmp_table_size ...For optimal performance, transactions that move through the binary log should be contained within the binary log ...
https://dev.mysql.com/doc/heatwave/en/mys-hw-debugging-queries.html
Enable MySQL Optimizer Trace If a query fails to offload and you cannot identify the reason, enable tracing and query the INFORMATION_SCHEMA.OPTIMIZER_TRACE table to debug the query. row *************************** id: 1 select_type: SIMPLE table: ... This topic describes how to debug queries that fail to offload to MySQL HeatWave for ...
https://dev.mysql.com/doc/refman/8.4/en/innodb-statistics-estimation.html
Optimizer statistics are not persisted to disk when innodb_stats_persistent=OFF or when individual tables are created or altered with STATS_PERSISTENT=0. Optimizer Statistics Updates Non-persistent optimizer statistics are updated when: Running ...
https://dev.mysql.com/doc/refman/8.4/en/performance-schema-statement-digests.html
The copy of the normalized statement digest is stored in the appropriate Performance Schema tables, along with the SHA-256 hash value computed from the original normalized statement. Statement Digests in the Performance Schema In the Performance ...
https://dev.mysql.com/doc/mysql-ai/9.5/en/mys-mysqlai-ml-model-import.html
Models in ONNX format (.onnx) cannot be loaded directly into a MySQL table. Before running ML_MODEL_IMPORT, follow the instructions in Import an External ONNX Model to pre-process and then load the model into a temporary table to use with AutoML.
https://dev.mysql.com/doc/mysql-enterprise-backup/8.4/en/bugs.backup.html
Here is a list of limitations of MySQL Enterprise Backup: In some cases, backups of non-transactional tables such as MyISAM tables could contain additional uncommitted data. If autocommit is turned off, and both InnoDB tables and non-transactional ... Please refer to the MySQL Enterprise Backup 8.4 Release Notes for a list of fixed bugs for ...
https://dev.mysql.com/doc/refman/8.4/en/firewall-usage.html
Scheduling Firewall Cache Reloads Each time the MYSQL_FIREWALL server-side plugin initializes, it loads data from these tables to its internal cache: firewall_whitelist firewall_group_allowlist firewall_users firewall_groups firewall_membership ...
https://dev.mysql.com/doc/heatwave/en/mys-hw-lakehouse-overview.html
While Lakehouse provides in-memory query processing on data in Object Storage, it does not load data into a DB System table. External Tables When MySQL HeatWave loads data and creates a table from a file in Object Storage, it is an external ... The ...
https://dev.mysql.com/doc/refman/8.4/en/federated-description.html
When you create a table using one of the standard storage engines (such as MyISAM, CSV or InnoDB), the table consists of the table definition and the associated data. When you create a FEDERATED table, the table definition is the same, but the ...