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https://dev.mysql.com/doc/refman/5.7/en/se-csv-repair.html
The CSV storage engine supports the CHECK TABLE and REPAIR TABLE statements to verify and, if possible, repair a damaged CSV table. When running the CHECK TABLE statement, the CSV file is checked for validity by looking for the correct field ...
https://dev.mysql.com/doc/refman/5.7/en/flush.html
| table_synonym WITH READ LOCK | table_synonym tbl_name [, tbl_name] ... FOR EXPORT } table_synonym: { TABLE | TABLES } The FLUSH statement has several variant forms that clear or reload various internal caches, flush tables, or acquire locks. Note ...Specific flush options might require additional privileges, as indicated in the option ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-programs-ndb-select-all.html
ndb_select_all prints all rows from an NDB table to stdout. Usage ndb_select_all -c connection_string tbl_name -d db_name [> file_name] Options that can be used with ndb_select_all are shown in the following table. --database=dbname, -d dbname Name ...--connect-retries Command-Line Format --connect-retries=# Type Integer Default Value 12 Minimum Value 0 Maximum Value 12 Number of times to retry connection before giving ...
https://dev.mysql.com/doc/refman/5.7/en/getting-information.html
What if you forget the name of a database or table, or what the structure of a given table is (for example, what its columns are called)? MySQL addresses this problem through several statements that provide information about the databases and ...
https://dev.mysql.com/doc/refman/5.7/en/innodb-best-practices.html
Specify a primary key for every table using the most frequently queried column or columns, or an auto-increment value if there is no obvious primary key. Use joins wherever data is pulled from multiple tables based on identical ID values from those ...Adding foreign keys ensures that referenced columns are indexed, which can improve ...
https://dev.mysql.com/doc/refman/5.7/en/optimizing-innodb-storage-layout.html
Once your data reaches a stable size, or a growing table has increased by tens or some hundreds of megabytes, consider using the OPTIMIZE TABLE statement to reorganize the table and compact any wasted space. The reorganized tables require less disk ...This is a straightforward technique that can improve performance when other techniques such as improving index usage or tuning application code are not ...
https://dev.mysql.com/doc/refman/5.7/en/dynamic-format.html
Dynamic storage format is used if a MyISAM table contains any variable-length columns (VARCHAR, VARBINARY, BLOB, or TEXT), or if the table was created with the ROW_FORMAT=DYNAMIC table option. You can use OPTIMIZE TABLE or myisamchk -r to ...
https://dev.mysql.com/doc/refman/5.7/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/5.7/en/replication-features-create-select.html
SELECT statement to make any changes in tables other than the table that is created by the statement. Some older versions of MySQL permitted these statements to do so; this means that, when using replication between a MySQL 5.6 or later replica and ...To prevent this from happening, you should use row-based replication, rewrite the offending statement before running it on the source, or upgrade the source to MySQL ...
https://dev.mysql.com/doc/refman/5.7/en/federated-create-server.html
If you are creating a number of FEDERATED tables on the same server, or if you want to simplify the process of creating FEDERATED tables, you can use the CREATE SERVER statement to define the server connection parameters, just as you would with the ...For more information on CREATE SERVER, see Section 13.1.17, “CREATE SERVER ...