Table − A table, meaning a spreadsheet, is a matrix containing data. There are three options for mysqldump backups −, Raw data − Dump a table as a raw data file through the --tab option, which also specifies the destination of the file −, Data/Definitions export − This option allows a single or multiple tables to be exported to a file, and supports backing up all existing databases on the host machine. ROLLBACK ends the transaction, destroying any changes. The following example demonstrates how to use the mysqladmin binary to delete an existing database −. SAVEPOINT sets a restore point to utilize with ROLLBACK. Limit input to the necessary data type and size. MariaDB allows for setting a higher value for NULL values. Review the following example, which reveals what happens in a table containing indexed values on insertion into a populated field −. However, databases prove the best option for large datasets, which would suffer from slow retrieval and writing with other data sources. Two of the functions used in this guide are as follows −, The following example demonstrates the general syntax of a PHP call to a MariaDB function −. Review the PHP disconnection script syntax given below −. You will use the mysql_query() function once again. They always appear at the end of a statement, not in a subquery or before a set function, because they operate on the final resulting table. Accommodate that need in your strategy for managing duplicate records. In some situations, duplicates do cause problems, and they often appear due to implicit actions or the lenient policy of a MariaDB command. Employ a LIKE clause either at the command prompt or within a PHP script. Test the installation by starting it from the command prompt. Use SHOW INDEX to list all existing indexes associated with a given table. VARCHAR − This data type represents a variable-length string, with an M range (maximum column length) of 0 to 65535. However, many users find index maintenance cumbersome. It returns the largest integer not above x. Before we begin our discussion of MariaDB, let us review a few terms related to databases. MariaDB is an open-source relational database technology. They sometimes conflict with shadow names of non-temporary tables. Atomicity − It ensures the success of all operations by aborting on failures and rolling back changes. Physical backups contain copies of data. Transactions conform to ACID (Atomicity, Consistency, Isolation, and Durability) −. Review the following drop database script syntax −, Try the following example code for deleting a database −. Row − A row is a structure grouping related data; for example, data for a customer. The attribute “AUTO_INCREMENT” instructs MariaDB to add the next available value to the ID field. Using sequences requires installing the sequence engine, which MariaDB distributes as a plugin rather than binary. Example − SELECT MICROSECOND('16:30:00.543876'); Example − SELECT MINUTE('2016-05-22 17:22:01'); Example − SELECT SECOND('2016-03-12 16:30:04.000001'); It formats the time in accordance with the specified format string. REGEXP returns 1 for a pattern match or 0 in the absence of one.