Wait Instrument Components • wait/io An instrumented I/O operation. • wait/io/file An instrumented file I/O operation. For files, the wait is the time waiting for the file operation to complete (for example, a call to fwrite()). Due to caching, the physical file I/O on the disk might not happe...
Writing Applications for the InnoDB memcached Interface Typically, writing an application for the InnoDB memcached interface involves some degree of rewriting or adapting existing code that uses MySQL or the
Adapting an Existing memcached Application for the Integrated memcached Daemon Consider these aspects of MySQL and InnoDB tables when adapting an existing memcached application to use the MySQL...
Adapting Database Best Practices to memcached Applications The most direct way to cache MySQL data is to use a 2-column table, where the first column is a primary key. Because of the uniqueness requirements for memcached keys, make sure your da...
Adapting DML Statements to memcached Operations Benchmarks suggest that the InnoDB memcached plugin speeds up DML operations (inserts, updates, and deletes) more than it speeds up queries. You might focus your initial development efforts on wri...
Adapting SQL Queries The types of queries that are most suited to the simple GET request style are those with a single clause, or a set of AND conditions, in the WHERE clause: SQL: select col from tbl where key = 'key_value'; memcached: GET...
Advantages of row-based replication • All changes can be replicated. This is the safest form of replication. The mysql database is not replicated. The mysql database is instead seen as a node-specific database. Row-based replication is not supported on tables in this database. Instead, statements...
Allowing or Disallowing DDL By default, you can perform DDL operations such as ALTER TABLE on the tables being used by the InnoDB memcached plugin. To avoid potential slowdowns when these tables are being used for high-throughput applications, yo...
Backing Up a Master or Slave by Making It Read Only It is possible to back up either master or slave servers in a replication setup by acquiring a global read lock and manipulating the read_only [545] system variable to change the read-only state of the server to be backed up: 1. Make the server...
Backing Up a Slave Using mysqldump Using mysqldump to create a copy of a database enables you to capture all of the data in the database in a format that enables the information to be imported into another instance of MySQL Server (see Section 4.5.4, “mysqldump — A Database Backup Program”). Beca...
