By Mats Kindahl, Lars Thalmann
Server bottlenecks and screw ups are a truth of existence in any database deployment, yet they don’t need to deliver every thing to a halt. This functional ebook explains replication, cluster, and tracking beneficial properties that may support shield your MySQL approach from outages, even if it’s operating on undefined, digital machines, or within the cloud.
Written by way of engineers who designed some of the instruments coated, this booklet finds undocumented or hard-to-find elements of MySQL reliability and excessive availability—knowledge that’s crucial for any association utilizing this database approach. This moment version describes huge adjustments to MySQL instruments. models as much as 5.5 are lined, in addition to numerous 5.6 features.
- Learn replication basics, together with use of the binary log and MySQL Replicant Library
- Handle failing parts via redundancy
- Scale out to regulate read-load raises, and use facts sharding to deal with huge databases and write-load increases
- Store and reflect info on person nodes with MySQL Cluster
- Monitor database task and function, and significant working procedure parameters
- Keep tune of masters and slaves, and care for disasters and restarts, corruption, and different incidents
- Examine instruments together with MySQL firm video display, MySQL Utilities, and GTIDs
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Additional info for MySQL High Availability: Tools for Building Robust Data Centers
Use MySQL company Backup (or XtraBackup) to do an internet backup of MySQL. Scripting the Clone Operation The Python library clones a grasp just by copying the database from the grasp utilizing the Server item that represents the grasp. to do that, it makes use of a clone functionality, which you may see in instance 3-6. Cloning a slave is the same, however the backup is taken from one server, whereas the recent slave connects to a different server to accomplish replication. one could help cloning either a grasp and a slave through the use of diversified parameters: a resource parameter that specifies the place the backup will be created and a use_master parameter that exhibits the place the slave may still attach after the backup is restored. a decision to the clone technique appears like the subsequent: clone(slave = slave, resource = slave, use_master = grasp) your next step is to put in writing a few application services to enforce the cloning functionality, so that it will additionally turn out to be useful for different actions. instance 3-5 indicates the next features: fetch_master_pos Fetches the binlog place from a grasp (i. e. , the location of the following occasion the grasp will write to the binary log). fetch_slave_pos Fetches the binlog place from a slave (i. e. , the location of the following occasion to learn from the master). replicate_from Accepts as arguments a slave, a grasp, and a binlog place, and directs the slave to duplicate from the grasp beginning with the given place. The replicate_from functionality reads the sector repl_user from the grasp to get the identify and password of the replication person. should you examine the definition of the Server type, you’ll locate that there's no such box. it really is further by means of the grasp position while the server is imbued. instance 3-5. application services to fetch the grasp and slave positions of a server _CHANGE_MASTER_TO = """CHANGE grasp TO MASTER_HOST=%s, MASTER_PORT=%s, MASTER_USER=%s, MASTER_PASSWORD=%s, MASTER_LOG_FILE=%s, MASTER_LOG_POS=%s""" def replicate_from(slave, grasp, position): slave. sql(_CHANGE_MASTER_TO, (master. host, grasp. port, grasp. repl_user. identify, grasp. repl_user. passwd, place. dossier, place. pos)) def fetch_master_pos(server): end result = server. sql("SHOW grasp STATUS") go back Position(server. server_id, result["File"], result["Position"]) def fetch_slave_pos(server): consequence = server. sql("SHOW SLAVE STATUS") go back Position(server. server_id, result["Relay_Master_Log_File"], result["Exec_Master_Log_Pos"]) those are the entire features had to create the clone functionality. To clone a slave, the calling software passes a separate use_master argument, inflicting clone to direct the hot slave to that grasp for replication. To clone a grasp, the calling software omits the separate use_master argument, inflicting the functionality to take advantage of the “source” server as a grasp. simply because there are numerous how one can create a backup of a server, instance 3-6 restricts the strategy to 1 selection, utilizing mysqldump to create a logical backup of the server. Later, we are going to reveal easy methods to generalize the backup strategy so you might use an identical uncomplicated code to bootstrap new slaves utilizing arbitrary backup tools.