MariaDB provides enterprise open source database and database services to support scalability, mission-critical deployments, and more.
“MongoDB and everything that comes with it was great. On MongoDB, we could automate our deployments and scalability monitoring, and we had advanced features like search charts and an online vector store that didn’t exist in the CouchDB ecosystem.” ...
在以下示例中,innodb_buffer_pool_size设置为3G,innodb_buffer_pool_instances设置为8。innodb_buffer_pool_chunk_size默认值为128M。 3G是有效的innodb_buffer_pool_size值,因为3G是innodb_buffer_pool_instances = 8 * innodb_buffer_pool_chunk_size = 128M的倍数 # mysqld--innodb_buffer_pool_size=3G --...
Find your db size query ; SELECT s.schema_name, CONCAT(IFNULL(ROUND((SUM(t.data_length)+SUM(t.index_length)) /1024/1024,2),0.00)) total_size_in_MB, CONCAT(IFNULL(ROUND(((SUM(t.data_length)+SUM(t.index_length))-SUM(t.data_free))/1024/1024,2),0.00)) data_used_IN_MB, ...
db.createCollection(name,{size:3333,capped:333,max:88888}) 创建一个数据集,相当于一个表 db.currentOp() 取消当前库的当前操作 db.dropDataBase() 删除当前数据库 db.eval(func,args) run code server-side db.getCollection(cname) 取得一个数据集合,同用法:db['cname'] or ...
MySQL从4.0的版本开始支持union查询,它可以把需要使用临时表的两条或更多的select查询合并的一个查询中。在客户端的查询会话结束的时候,临时表会被自动删除,从而保证数据库整齐、高效。使用union来创建查询的时候,我们只需要用UNION作为关键字把多个select语句连接起来就可以了,要注意的是所有select语句中的字段数目要想...
IN A ;; ANSWER SECTION: r-mysql-mgr-server-lhr.service.consul. 0 IN A 192.168.68.62 r-mysql-mgr-server-lhr.service.consul. 0 IN A 192.168.68.61 ;; Query time: 0 msec ;; SERVER: 192.168.68.66#8600(192.168.68.66) ;; WHEN: Wed Mar 10 10:52:12 CST 2021 ;; MSG SIZE rcvd: 98 ...
sudo service mysql start 这样可以在不丢失数据的情况下修复InnoDB引擎无法启动的问题。2. 检查my.cnf文件的配置参数 如果MySQL的配置文件my.cnf中存在参数配置错误,可能会导致InnoDB引擎无法启动。检查my.cnf文件的innodb_buffer_pool_size、innodb_log_file_size、innodb_log_buffer_size等参数的值是否...
make sure that the settings for theinnodb_data_file_pathandinnodb_log_file_sizeconfiguration parameters are in place in the MySQLconfiguration filebefore runningmysql_install_db. Also make sure to specify as necessary other parameters that affect the creation and location ofInnoDBfiles, such asinnodb...
这次,MySQL会使用到idx_department_name索引来加速查询。 索引合并原理 索引合并的原理可以通过以下状态图来表示: StartIndexMergeSelectRowsMergeResults IndexMerge状态表示MySQL在查询执行计划中选择了索引合并算法。 SelectRows状态表示MySQL使用索引合并算法选择满足IN条件的行。