“MariaDB Frequently Asked Questions in various MariaDB job interviews by interviewer. The set of questions are here to ensures that you offer a perfect answer posed to you. So get preparation for your new job interview”
MariaDB supports all clauses used in RDBMS. For example:
☛ MariaDB Where Clause
☛ MariaDB Like Clause
☛ MariaDB Order By Clause
☛ MariaDB DISTINCT Clause
☛ MariaDB FROM Clause
☛ Etc.
To provide a community developed, stable, and always Free DBMS that is, on the user level, broadly compatible with MySQL.
We strive for interoperability with both our own, and our upstream, communities.
Until MariaDB 5.5, MariaDB was kept up to date with the latest MySQL release from the same branch. For example MariaDB 5.1.47 was up to date with MySQL 5.1.47, and so on.
We did a merge from the main MySQL branch for every new MySQL release or when there was some critical bugfix applied to the main branch.
Since MariaDB 10.0, MariaDB includes backported features from MySQL as well as entirely new features not found anywhere else, but does not necessarily include all MySQL features.
We strive to keep our main trees as free from bugs as possible. It should be reasonably safe to pull from our trees at any time.
Any released version.
However, MariaDB 5.2.5 and below were all compiled for 32-bit Windows only. These versions of MariaDB will run under 64-bit Windows, but they will run as 32-bit processes.
MariaDB 5.2.6 and above have 64-bit Windows binaries available. 64-bit binaries (and MSI packages) can also be built from the source, as described in Building MariaDB on Windows.
If you can't find help in the MariaDB documentation, in many cases the documentation for MySQL can be used. New features of MariaDB are mentioned on the MariaDB versus MySQL page and in greater detail under the MariaDB category.
If you have a question about a feature that is not properly documented or something that is not working as expected, go to the corresponding Knowledge Base page and ask your question there.
You can report and check on bugs which are unique to MariaDB in JIRA. MySQL bugs that also affect MariaDB should also be reported to MySQL.
You can also subscribe to the mailing lists and or join the IRC channel to communicate with MariaDB users and developers.
The MariaDB Corporation offers commercial support for MariaDB and all major MySQL versions (starting from MySQL 3.23).
Following is a list of features of MariaDB:
☛ MariaDB can run on different operating systems and support a wide variety of programming language.
☛ MariaDB follows a standard and popular querying language.
☛ MariaDB provides Galera cluster technology.
☛ MariaDB provides supports for PHP which is the most popular web development language.
LIMIT clause is used with SELECT statement to select a limited number of records from a table. It facilitates you to retrieve records according to your use.
Syntax:
SELECT expressions
FROM tables
[WHERE conditions]
[ORDER BY expression [ ASC | DESC ]]
LIMIT row_count;
A query such as
SELECT field1, field2 FROM ( SELECT field1, field2 FROM table1 ORDER BY field2 ) alias
returns a result set that is not necessarily ordered by field2. This is not a bug.
A "table" (and subquery in the FROM clause too) is - according to the SQL standard - an unordered set of rows. Rows in a table (or in a subquery in the FROM clause) do not come in any specific order. That's why the optimizer can ignore the ORDER BY clause that you have specified. In fact, SQL standard does not even allow the ORDER BY clause to appear in this subquery (we allow it, because ORDER BY ... LIMIT ... changes the result, the set of rows, not only their order).
You need to treat the subquery in the FROM clause, as a set of rows in some unspecified and undefined order, and put the ORDER BY on the top-level SELECT.
If you want to contribute to, or participate in the development of MariaDB, there are many ways to do so. You don't have to be a developer (but we always welcome more of those), you just have to have the willingness to help make MariaDB better. For example, we are looking for writers or translators of KB articles and people helping setting up MariaDB discussions groups.
Ready to begin?
Contributing to the MariaDB Project is the page that gathers together everything you need to get started.
The community category contains a lot of interesting links about how to participate.
You can also consider sponsoring a feature.
Welcome to the MariaDB community!
MariaDB is a backward compatible, drop-in replacement of the MySQL® Database Server. It includes all major open source storage engines.
Development on Cassandra SE appears to have stopped.
If you've got a solution that currently works with MySQL, it will work with MariaDB. Do we have specific solutions that we recommend? No. There's a wide array out there, and I'd encourage you to take your pick (the right one, for the right solution).
☛ Allow them explain and go into detail about the problem as well as the solution.
☛ Why was it a problem ?
☛ How did you fix it?
☛ Was it a revenue dependent emergency fix?
☛ Did the problem reappear or stay fixed ?
MariaDB LEFT OUTER JOIN is used to return all rows from left-hand table specified in the ON condition and only those rows from the other table where the joined condition is satisfied.
LEFT OUTER JOIN is also called LEFT JOIN.
Syntax:
SELECT columns
FROM table1
LEFT [OUTER] JOIN table2
ON table1.column = table2.column;
MariaDB COUNT() aggregate function is used to return the count of an expression.
Syntax:
SELECT COUNT(aggregate_expression)
FROM tables
[WHERE conditions];
This will show if they use tools or hack methods.
Normally, replication stops when an error occurs on the slave, so if they force an error that is replicated it would stop the all slaves at the same point in time, an "old school" method to stoping the slaves.
MariaDB SUM function is used to return the summed value of an expression.
Syntax:
SELECT SUM(aggregate_expression)
FROM tables
[WHERE conditions];
INSERT INTO statement is used to insert records in a table in MariaDB database.
Syntax:
INSERT INTO tablename (field,field2,...) VALUES (value, value2,...);
WHERE clause is used to select or change a specific location to fetch the records from a table. It is used with SELECT, INSERT, UPDATE and DELETE statement.
Syntax:
[COMMAND] field,field2,... FROM table_name,table_name2,... WHERE [CONDITION]
MariaDB INNER JOIN is the most common type of join which returns all rows from multiple tables where the join condition is satisfied.
Syntax:
SELECT columns
FROM table1
INNER JOIN table2
ON table1.column = table2.column;
Allow them to talk and explain what they like and why. This will allow you to see what they hold dear as values. Some might prefer MariaDB because they are dedicated to the open source message, others might prefer Percona because if offers open source tools while others prefer MySQL because that is the source and original.
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