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https://dev.mysql.com/doc/refman/8.0/en/innodb-file-defragmenting.html
One symptom of fragmentation is that a table takes more space than it “should” take. Another symptom of fragmentation is that a table scan such as this takes more time than it “should” take: SELECT COUNT(*) FROM t WHERE non_indexed_column <> ... Random insertions into or deletions from a secondary index can cause the index to become ...
https://dev.mysql.com/doc/refman/8.0/en/static-format.html
Creating a table having such columns with an explicit ROW_FORMAT clause does not raise an error or warning; the format specification is ignored. It is used when the table contains no variable-length columns (VARCHAR, VARBINARY, BLOB, or TEXT). Also, ...Of the three MyISAM storage formats, static format is the simplest and most secure (least subject to ...
https://dev.mysql.com/doc/refman/8.0/en/partitioning-management.html
Note All partitions of a partitioned table must have the same number of subpartitions; it is not possible to change the subpartitioning once the table has been created. To change a table's partitioning scheme, it is necessary only to use the ALTER ... There are a number of ways using SQL statements to modify partitioned tables; it is possible to add, drop, redefine, merge, or split existing partitions using the partitioning extensions to the ALTER TABLE ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-programs-ndbinfo-select-all.html
ndbinfo_select_all is a client program that selects all rows and columns from one or more tables in the ndbinfo database Not all ndbinfo tables available in the mysql client can be read by this program (see later in this section). In addition, ...
https://dev.mysql.com/doc/refman/8.0/en/backup-methods.html
You can also create a binary backup simply by copying the table files, as long as the server is not updating anything. Making Delimited-Text File Backups To create a text file containing a table's data, you can use SELECT * INTO OUTFILE 'file_name' ...Making a Hot Backup with MySQL Enterprise Backup Customers of MySQL Enterprise Edition can use the MySQL Enterprise Backup product to do physical backups of entire instances or selected databases, tables, or ...
https://dev.mysql.com/doc/refman/8.0/en/storage-requirements.html
Leftover Digits Number of Bytes 0 0 1 1 2 1 3 2 4 2 5 3 6 3 7 4 8 4 Date and Time Type Storage Requirements For TIME, DATETIME, and TIMESTAMP columns, the storage required for tables created before MySQL 5.6.4 differs from tables created from 5.6.4 ... InnoDB Table Storage Requirements NDB Table Storage Requirements Numeric Type Storage Requirements Date and Time Type Storage Requirements String Type Storage Requirements Spatial Type Storage Requirements JSON Storage Requirements The storage requirements for table data on disk depend on several ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-compression-background.html
An InnoDB table created with ROW_FORMAT=COMPRESSED can use a smaller page size on disk than the configured innodb_page_size value. The compressed page size is specified through the CREATE TABLE or ALTER TABLE KEY_BLOCK_SIZE parameter. Specify a ...
https://dev.mysql.com/doc/refman/8.0/en/problems-connecting.html
Under Linux or Unix, check your IP tables (or similar) configuration to ensure that the port has not been blocked. The grant tables must be properly set up so that the server can use them for access control. For some distribution types (such as ...
https://dev.mysql.com/doc/refman/8.0/en/fulltext-fine-tuning.html
To rebuild FULLTEXT indexes for an InnoDB table, use ALTER TABLE with the DROP INDEX and ADD INDEX options to drop and re-create each index. Some variable changes require that you rebuild the FULLTEXT indexes in your tables. Note Minimum and maximum ...You can exert more control over full-text searching behavior if you have a MySQL source distribution because some changes require source code ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-online-add-node-remarks.html
However, all data and indexes added to tables created after a new node group has been added are distributed automatically among all cluster data nodes, including those added as part of the new node group. Normal DML operations using NDB Cluster data ...The ability to add new nodes online includes a means to reorganize NDBCLUSTER table data and indexes so that they are distributed across all data nodes, including the new ones, by means of the ALTER TABLE ...