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https://dev.mysql.com/doc/refman/8.0/en/precision-math-expressions.html
If the value has too many digits in the integer part, it is too large (out of range) and is handled as follows: If strict mode is not enabled, the value is truncated to the nearest legal value and a warning is generated. If the value has too many ...
https://dev.mysql.com/doc/refman/8.0/en/fulltext-boolean.html
Whether a word is too short is determined from the innodb_ft_min_token_size setting for InnoDB tables, or ft_min_word_len for MyISAM tables. If the minimum word length is 4, a search for '+word +the*' could return fewer rows than a search for '+word ...| +----+-----------------------+-------------------------------------+ Note In implementing this feature, MySQL uses what is sometimes referred to as implied Boolean logic, in which + stands for AND - stands for NOT [no operator] implies OR Boolean full-text searches have these characteristics: They do not automatically sort rows in order of decreasing ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-what-is-new.html
Pushing down larger parts of a condition allows more rows to be filtered out by the data nodes, thereby reducing the number of rows which mysqld must handle during join processing. This enables use of a large cache for logging NDB transactions, and ...NDB 8.0 adds two status variables relating to automatic synchronization: Ndb_metadata_synced_count shows the number of objects synchronized automatically; Ndb_metadata_excluded_count indicates the number of objects for which synchronization has failed (prior to NDB 8.0.22, this variable was named ...
https://dev.mysql.com/doc/refman/8.0/en/optimizing-innodb-diskio.html
If the Unix top tool or the Windows Task Manager shows that the CPU usage percentage with your workload is less than 70%, your workload is probably disk-bound. Increase buffer pool size When table data is cached in the InnoDB buffer pool, it can be ... If you follow best practices for database design and tuning techniques for SQL operations, but your database is still slow due to heavy disk I/O activity, consider these disk I/O ...
https://dev.mysql.com/doc/refman/8.0/en/unix-signal-response.html
On Unix and Unix-like systems, a process can be the recipient of signals sent to it by the root system account or the system account that owns the process. Some command interpreters associate certain key sequences with signals, such as Control+C to ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-buffer-pool.html
Ideally, you set the size of the buffer pool to as large a value as practical, leaving enough memory for other processes on the server to run without excessive paging. For efficiency of high-volume read operations, the buffer pool is divided into ...
https://dev.mysql.com/doc/refman/8.0/en/information-schema-files-table.html
(Bug #92796, Bug #28800252) Prior to NDB 8.0.13, the FILES table contained a row for each of these files on each data node the file belonged to, as well as the size of its undo buffer. That is, the larger EXTENT_SIZE becomes, the less accurate the ...This means, for example, that the name of a data file created with ALTER TABLESPACE ts ADD DATAFILE 'data_2.dat' INITIAL SIZE 256M is shown as ...
https://dev.mysql.com/doc/refman/8.0/en/replication-sbr-rbr.html
Deterministic loadable functions that generate large BLOB values take longer to replicate with row-based replication than with statement-based replication. If, however, you want to take advantage of the features specific to the statement-based or ...
https://dev.mysql.com/doc/refman/8.0/en/storage-requirements.html
The internal representation of a table has a maximum row size of 65,535 bytes, even if the storage engine is capable of supporting larger rows. For more information, see Chapter 18, Alternative Storage Engines, and Section 10.4.7, “Limits on Table ...Table data might be compressed, either for a column or an entire row, complicating the calculation of storage requirements for a table or ... InnoDB Table Storage Requirements NDB Table Storage Requirements Numeric Type Storage Requirements Date and Time Type Storage Requirements String Type Storage ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-compression-tuning-monitoring.html
A large number of compression operations overall (compared to the number of INSERT, UPDATE and DELETE operations in your application and the size of the database) could indicate that some of your compressed tables are being updated too heavily for ...If so, choose a larger page size, or be more selective about which tables you ... Overall application performance, CPU and I/O utilization and the size of ...This section builds on the ...