Indexes Foreign keys In addition, details of any mismatches in metadata properties are now written to the MySQL server error log. The formats used for the error log messages differ slightly depending on whether the discrepancy is found on the table level or on the level of a column, index, ...
$> ndb_mgm -V MySQL distrib mysql-8.0.42 ndb-8.0.42, for Linux (x86_64) In MySQL Cluster NDB 8.0, these two version numbers are always the same. To build the MySQL source with NDB Cluster support, use the CMake option -DWITH_NDB (NDB 8.0.31 and later; for earlier releases, ...
MySQL 8.0 delivers support for indexes in descending order. Values in such an index are arranged in descending order, and we scan it forward. Before 8.0, when a user create a descending index, we created an ascending index and scanned it backwards. One benefit is that forward index scans ar...
MySQL 8.0 delivers support for indexes in descending order. Values in such an index are arranged in descending order, and we scan it forward. Before 8.0, when a user create a descending index, we created an ascending index and scanned it backwards. One benefit is that forward index scans ar...
MySQL 8.0 delivers support for indexes in descending order. Values in such an index are arranged in descending order, and we scan it forward. Before 8.0, when a user create a descending index, we created an ascending index and scanned it backwards. One benefit is that forward index scans ar...
Re: What is better to delete or to update rows in table with indexes?Posted by: eos li Date: May 27, 2008 10:04PM Is the status a primary key? If it is not a primary key, I think it is good to update the record. If you delete the record, you have to insert a new ...
MySQL Cluster disk data storage.Formerly, theNDBCLUSTERstorage engine was strictly in-memory; now, it is possible to store Cluster data (but not indexes) on disk. This allows MySQL Cluster to scale upward with fewer hardware (RAM) requirements than previously. In addition, the Disk Data implem...
MySQL can automatically scale to the total amount of memory available, to make the best possible use of virtual machine deployments. Indexes can be manually excluded from the query optimizer via the “invisible index” feature. Indexes marked as invisible are kept up to date with changes to tabl...
1. Start the MySQL Workbench with "C:\Program Files\MySQL\MySQL Workbench 8.0 CE\MySQLWorkbench.exe" command. 2. Click on the local MySQL server on the start page. 3. Login as "root" with the "TopSecret" password. You will see the main screen with the full functionalities available. ...
Run the EXPLAIN command with each of those queries and see how many rows are scanned, what indexes are used, etc. Put some sample data in the tables and get from statistics on how long the queries take, etc. Generally I place the joins in a logical, heuristic ordering with one join ...