i believe the choice you are ooking fo
A raid 1 and mirrored system writes data on two or more disks simultaneously, thereby creating a complete copy of all the information on multiple drives.
<h3>What is Disk mirroring?</h3>
In data storage, disk mirroring is a term that connote the doubling of logical disk volumes into a different physical hard disks so that it will always be available.
Conclusively, Note that this is mostly used in RAID 1. A mirrored volume is known to be full logical depiction of separate volume copies and as such the answer above is correct.
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The number of records or rows in a table using MySQL can be got by using the COUNT statement.
Explanation:
- To counts all of the rows in a table, whether they contain NULL values or not, use COUNT
- That form of the COUNT() function basically returns the number of rows in a result set returned by a SELECT statement
- The SQL COUNT() function returns the number of rows in a table satisfying the criteria specified in the WHERE clause.
- It sets the number of rows or non NULL column values.
- COUNT() returns 0 if there were no matching rows.
- The SQL COUNT function is an aggregate function that returns the number of rows returned by a query. You can use the COUNT function in the SELECT statement to get the number of employees, the number of employees in each department, the number of employees who hold a specific job, etc.
