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Posts Tagged ‘Storage Engine’

Check BLACKHOLE storage engine is available

Run the following command

mysql> SHOW VARIABLES LIKE ‘have_blackhole_engine’;

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BLACKHOLE storage engine

The BLACKHOLE storage engine accepts data but does not store anything . So on retrieval it will return nothing .

When we create BLACKHOLE table the server will create file with name starts with table name with extension .frm . No other tables will be generated as it stores nothing .

It supports all types of indexes .

Though nothing is stored , the query statements get stored if binary logs are enabled .

It does not support AUTO INCREMENT

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CSV Storage Engine

The ARCHIVE storage engine is used for storing large amounts of data without indexes in a very small footprint.

When you create an ARCHIVE table, the server creates a table format file in the database directory. The file begins with the table name and has an .frm extension. The storage engine creates other files, all having names beginning with the table name. The data and metadata files have extensions of .ARZ and .ARM, respectively. An .ARN file may appear during optimization operations.

The ARCHIVE engine supports INSERT and SELECT, but not DELETE, REPLACE, or UPDATE. It does support ORDER BY operations, BLOB columns


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ARCHIVE Storage Engine

The ARCHIVE storage engine is used for storing large amounts of data without indexes in a very small footprint.

When you create an ARCHIVE table, the server creates a table format file in the database directory. The file begins with the table name and has an .frm extension. The storage engine creates other files, all having names beginning with the table name. The data and metadata files have extensions of .ARZ and .ARM, respectively. An .ARN file may appear during optimization operations.

The ARCHIVE engine supports INSERT and SELECT, but not DELETE, REPLACE, or UPDATE. It does support ORDER BY operations, BLOB columns

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Check ARCHIVE storage engine is available

Run the following command
mysql> SHOW VARIABLES LIKE 'have_archive';
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FEDERATED Storage Engine

It is a storage engine that accesses data in tables of remote databases rather than in local tables.The FEDERATED storage engine is available beginning with MySQL 5.0.3.
This storage engine enables data to be accessed from a remote MySQL database on a local server without using replication or cluster technology. When using a FEDERATED table, queries on the local server are automatically executed on the remote (federated) tables. No data is stored on the local tables.
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EXAMPLE Storage Engine

The EXAMPLE storage engine is a stub engine that do nothing. Its purpose is to serve as an example in the MySQL source code that illustrates how to begin writing new storage engines. As such, it is primarily of interest to developers.To examine the source for the EXAMPLE engine, look in the sql/examples directory of a MySQL source distribution.

When you create an EXAMPLE table, the server creates a table format file in the database directory. The file begins with the table name and has an .frm extension. No other files are created. No data can be stored into the table. Retrievals return an empty result.

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BDB Storage Engine

MySQL with the Berkeley DB transactional storage engine is called BDB for short.
BDB tables may have a greater chance of surviving crashes and are also capable of COMMIT and ROLLBACK operations on transactions.

Note that as of MySQL 5.1, its not supported  .

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