By using the SQL syntax and MySQL configuration options for compression, you can create tables where the data is stored in compressed form. Compression can help to improve both raw performance and scalability. The compression means less data is transferred between disk and memory, and takes up le...
TheINNODB_CMP_PER_INDEXtable reports information about compression activity for individual tables and indexes. This information is more targeted and more useful for evaluating compression efficiency and diagnosing performance issues one table or index at a time. (Because that each InnoDB table is repres...
17.9.1.4 Monitoring InnoDB Table Compression at Runtime Overall application performance, CPU and I/O utilization and the size of disk files are good indicators of how effective compression is for your application. This section builds on the performance tuning advice fromSection 17.9.1.3, “Tuning C...
17.9.1.4 Monitoring InnoDB Table Compression at Runtime Overall application performance, CPU and I/O utilization and the size of disk files are good indicators of how effective compression is for your application. This section builds on the performance tuning advice from Section 17.9.1.3, “Tuning...
ALTERTABLEcompress_testROW_FORMAT=COMPRESSEDKEY_BLOCK_SIZE=8; 4、压缩效果 压缩效果通过线上的一个监控的表修改为压缩后的文件大小来说明,压缩前后对比如下: 四、参考文献 https://dev.mysql.com/doc/refman/5.7/en/innodb-compression-background.html ...
创建新的元数据表如果我们希望在 performance_schema 库中新增加一个描述列式二级引擎列相关信息的元数据表 mock_columns，用来描述加载到 mock_columns 的列式数据情况，比如被加载到了 mock 引擎中的列名列号，所属表名，ndv(number of disctinct value)等信息。以 t1 表为例createtable t1 (c1 int PRIMAEY_...
intrnd_init(boolscan) intrnd_next(void) intread_row_values(TABLE*table,unsignedchar*buf,Field**fields,boolread_all) 如果我们希望在 performance_schema 库下新增一张元数据表,需要重载以上三个方法,rnd_init 函数做一些初始化工作,rnd_next 函数从全局映射表 meta_column_columns 中将下一条记录取到 m...
threads-Threads subsystem performance test mutex-Mutex performance test AI代码助手复制代码 基本语法如下: sysbench [options]... [testname] [command] command 是sysbench要执行的命令,包括prepare、run和cleanup。prepare是为测试提前准备数据,run是执行正式的测试,cleanup是在测试完成后对数据库进行清理 ...
Compression: 客户端连接是否在客户端/服务器协议中使用压缩。在 MySQL 8.0.18 中已弃用。 Slave_open_temp_tables: 复制 SQL 线程当前打开的临时表数量。在 MySQL 8.0.26 中已弃用。 Slave_rows_last_search_algorithm_used: 此副本最近用于定位行以进行基于行的复制(索引、表或哈希扫描)的搜索算法。在 MySQL ...
其中的 performance schema 用于监控 MySQL server 在一个较低级别的运行过程中的资源消耗、资源等待等情况。它提供了一种在数据库运行时实时检查 server 的内部执行情况的方法,该数据库主要关注数据库运行过程中的性能相关的数据,与更为常见的 information_schema 不同,information_schema 主要关注 server 运行过程中的...