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Additional info for ACTUALTESTS Oracle 1Z0-007 Exam Q and A 04 04 05
Tungsten Replicator will be covered in more detail in Chapter 6. It may be time to shard your environment. Sharding is a way to segment data into multiple vertical silos or partitions. Typically, sharding is needed to scale write activity in an environment, meaning expanding the number of master servers you have vertically. If an environment is made up of a master/slave topology where replication lag is prevalent, you may need to move some of the operations to a new master/slave topology.
Setting the system variable, read_only, to 1 or ON is highly recommended to ensure no data modification can occur on a slave. *), this user can bypass the read_only setting on the slave. This is an avoidable problem that is solved by using discretion when creating application user privileges. Running replication while skipping databases and/or tables with --replicate-ignore-db or --replicate-ignore-table can also prove to be a problem. Session data, for example, stored in a database does not generally require replication in most cases; however, if you are ignoring the database or table and need to fail over or rebuild a node, you introduce additional complications.
A success indicator is returned to the calling client program to indicate the completion of the transaction (Point 4). 5. The slave server detects a change has occurred in the master binary log position (Point 5). 6. , a pull process) by the slave server and written to the slave relay log by the slave I/O thread (Point 6). indd 14 9/6/12 2:22 PM Oracle_Flash / Effective MySQL: Replication Techniques in Depth / Bradford / 186-8 15 Diagnosing Common Replication Problems 1 Client Process 4 5 MySQL Kernel 3 2 Data MySQL Kernel InnoDB Trans Log Binary Log Master 6 IO Thread Relay Log 7 SQL Thread Data 8 InnoDB Trans Log Slave Figure 2-1 MySQL replication workflow 7.