MySQL Cluster7.2在线增加数据节点存在重大弊病-Mysql Tutorial-php.cn

Home

Database

Mysql Tutorial

MySQL Cluster7.2在线增加数据节点存在重大弊病

WBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWB

Jun 07, 2016 pm 04:23 PM

mysqlonlineIncreasedatanode

MySQL Cluster7.2在线增加数据节点存在重大弊端今天我尝试了下mysql cluster7.2最新版，在线增加数据节点的时候，存在重大弊端。到底是什么弊端？答：首先，新增加的节点，按照手册上给出的步骤，必须重启所有的NODB数据节点，并且重启所有的SQL节点，从设

MySQL Cluster7.2在线增加数据节点存在重大弊端

今天我尝试了下mysql cluster7.2最新版，在线增加数据节点的时候，存在重大弊端。

到底是什么弊端？

答：首先，新增加的节点，按照手册上给出的步骤，必须重启所有的NODB数据节点，并且重启所有的SQL节点，从设计上就很不合理，重启数据节点，避免不了造成性能下降，重启SQL节点，很可能造成前端程序，比如PHP访问不了数据库，当然，SQL节点可以通过安装LVS+Keepalive避免这个问题的发生，但避免不了造成性能下降。

其次，重大弊端是：前端PHP程序往里面插入数据的时候，新增加的节点不能往里面写数据，手册上说的，必须通过命令ALTER ONLINE TABLE test.t1 OPTIMIZE TABLE;重新进行分片，这样才能激活新增加的节点，假如我有个表很大，70多G，那么这么大的表进行分片操作，时间就会非常长，而且这个时候会锁表，导致前端访问不了该表，并且有可能出现未知的错误。这点设计上非常的傻，不能自动识别，而且手工识别，风险太大。

所以，一开始就要规划好，我的数据量有多大，压力有多大，如果事后再亡羊补牢，mysql cluster这点上来看还很不成熟。期待着mysql cluster能像replication复制那样有更好的扩展性。

Statement

The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

What are the differences in syntax between MySQL and other SQL dialects?Apr 27, 2025 am 12:26 AM

MySQLdiffersfromotherSQLdialectsinsyntaxforLIMIT,auto-increment,stringcomparison,subqueries,andperformanceanalysis.1)MySQLusesLIMIT,whileSQLServerusesTOPandOracleusesROWNUM.2)MySQL'sAUTO_INCREMENTcontrastswithPostgreSQL'sSERIALandOracle'ssequenceandt

What is MySQL partitioning?Apr 27, 2025 am 12:23 AM

MySQL partitioning improves performance and simplifies maintenance. 1) Divide large tables into small pieces by specific criteria (such as date ranges), 2) physically divide data into independent files, 3) MySQL can focus on related partitions when querying, 4) Query optimizer can skip unrelated partitions, 5) Choosing the right partition strategy and maintaining it regularly is key.

How do you grant and revoke privileges in MySQL?Apr 27, 2025 am 12:21 AM

How to grant and revoke permissions in MySQL? 1. Use the GRANT statement to grant permissions, such as GRANTALLPRIVILEGESONdatabase_name.TO'username'@'host'; 2. Use the REVOKE statement to revoke permissions, such as REVOKEALLPRIVILEGESONdatabase_name.FROM'username'@'host' to ensure timely communication of permission changes.

Explain the differences between InnoDB and MyISAM storage engines.Apr 27, 2025 am 12:20 AM

InnoDB is suitable for applications that require transaction support and high concurrency, while MyISAM is suitable for applications that require more reads and less writes. 1.InnoDB supports transaction and bank-level locks, suitable for e-commerce and banking systems. 2.MyISAM provides fast read and indexing, suitable for blogging and content management systems.

What are the different types of JOINs in MySQL?Apr 27, 2025 am 12:13 AM

There are four main JOIN types in MySQL: INNERJOIN, LEFTJOIN, RIGHTJOIN and FULLOUTERJOIN. 1.INNERJOIN returns all rows in the two tables that meet the JOIN conditions. 2.LEFTJOIN returns all rows in the left table, even if there are no matching rows in the right table. 3. RIGHTJOIN is contrary to LEFTJOIN and returns all rows in the right table. 4.FULLOUTERJOIN returns all rows in the two tables that meet or do not meet JOIN conditions.

What are the different storage engines available in MySQL?Apr 26, 2025 am 12:27 AM

MySQLoffersvariousstorageengines,eachsuitedfordifferentusecases:1)InnoDBisidealforapplicationsneedingACIDcomplianceandhighconcurrency,supportingtransactionsandforeignkeys.2)MyISAMisbestforread-heavyworkloads,lackingtransactionsupport.3)Memoryengineis

What are some common security vulnerabilities in MySQL?Apr 26, 2025 am 12:27 AM

Common security vulnerabilities in MySQL include SQL injection, weak passwords, improper permission configuration, and unupdated software. 1. SQL injection can be prevented by using preprocessing statements. 2. Weak passwords can be avoided by forcibly using strong password strategies. 3. Improper permission configuration can be resolved through regular review and adjustment of user permissions. 4. Unupdated software can be patched by regularly checking and updating the MySQL version.

How can you identify slow queries in MySQL?Apr 26, 2025 am 12:15 AM

Identifying slow queries in MySQL can be achieved by enabling slow query logs and setting thresholds. 1. Enable slow query logs and set thresholds. 2. View and analyze slow query log files, and use tools such as mysqldumpslow or pt-query-digest for in-depth analysis. 3. Optimizing slow queries can be achieved through index optimization, query rewriting and avoiding the use of SELECT*.

See all articles