序号 适配接口名 说明 分类 1 HAL_Wifi_Get_Mac 获取设备的MAC地址，格式应当是”XX:XX:XX:XX:XX:XX”配网通用 2 HAL_Wifi_Get_IP 获取设备的IP地址，点分十进制格式保存在字符串数组出参，二进制格式则作为返回值，并以网络字节序（大端）...
when I/O loads are high,the system automatically triggers I/O burst to increase the I/O limit.When I/O loads decrease,the I/O limit is automatically restored.This provides serverless I/O performance and prevents waste of I...
当前版本：v1.6.15 版本号 变更内容 变更背景 重要公告 是否兼容存量接口 SDK是否更新 发布日期 v1.6.15 2.7查询商品列表（无本地缓存）CanNotBeSoldCode更新为isCanNotBeSoldCode CanNotBeSoldMessage更新为isCanNotBeSoldMessage 2023-10...
CREATE TABLE ORDERS(O_ORDERKEY BIGINT NOT NULL PRIMARY KEY,O_CUSTKEY INT NOT NULL,O_ORDERSTATUS CHAR(1)NOT NULL,O_TOTALPRICE DECIMAL(15,2)NOT NULL,O_ORDERDATE DATE NOT NULL,O_ORDERPRIORITY TEXT NOT NULL,O_CLERK TEXT NOT ...
CREATE TABLE ORDERS(O_ORDERKEY BIGINT NOT NULL PRIMARY KEY,O_CUSTKEY INT NOT NULL,O_ORDERSTATUS TEXT NOT NULL,O_TOTALPRICE DECIMAL(15,2)NOT NULL,O_ORDERDATE timestamptz NOT NULL,O_ORDERPRIORITY TEXT NOT NULL,O_CLERK TEXT ...
I/O吞吐限制 本地盘实例 本地SSD盘实例的架构是多个实例共享同一物理机的本地SSD盘，只限制了单个实例的最大IOPS，没有限制单个实例的I/O吞吐量，因此实际上单个实例的最大I/O吞吐量可以达到1 GB/Sec以上，但同时也存在I/O吞吐资源争抢问题...
The maximum I/O throughput and maximum IOPS per ESSD vary based on the ESSD capacity and ESSD performance level.For example,a single PL2 ESSD provides up to 750 MB/s I/O throughput and up to 100,000 IOPS.Relationship ...
different databases have different read and write processing capabilities.For example,the I/O block size of a cloud disk is 4 KB.For 1,000 disk I/O operations,the MySQL engine(default page size of 16 KB)performs 250 actual...
2025 Introduction The I/O acceleration and I/O burst features will be renamed for ApsaraDB RDS for PostgreSQL.The following table lists the original and new names of the features.Original name New name I/O acceleration ...
nanoseconds.blkio.throttle.io_completed The number of completed I/O operations.It is used to calculate the average latency of the block I/O throttling layer.blkio.throttle.total_io_queued The number of I/O operations that ...
see Use the I/O acceleration feature of general ESSDs.I/O performance burst Enabling the I/O performance burst feature for your RDS instance increases the maximum IOPS and maximum throughput of the instance.The following ...
If your business experiences significant fluctuations and frequent traffic peaks,you can enable the I/O performance burst feature for premium performance disks.This feature allows your disk's input/output operations per ...
2025(Singapore Time)Billing rules ApsaraDB RDS provides a free quota for the I/O performance burst feature.Usage that exceeds the free quota is charged on a pay-as-you-go basis.For more information,see Billing for I/O ...
2025 Introduction The I/O acceleration,I/O burst,and write optimization features will be renamed for ApsaraDB RDS for MySQL.The following table lists the original and new names of the features.Original name New name I/O ...
the system automatically triggers a burst to increase the I/O limit when the I/O load is high.After the I/O load drops,the I/O limit is automatically restored.This provides serverless I/O performance and prevents wasted ...
I/O事件持续出现且较多，出现I/O瓶颈，需进行具体查询分析。遇到I/O瓶颈时，可通过以下三种方式来进行分析观察：观察 polar_stat_activity_rt 中哪类进程I/O比较高。SELECT backend_type,SUM(local_read_iops local_write_iops)iops,SUM...
Alibaba Cloud plans to end the public preview of the I/O performance burst feature of Premium ESSDs used by ApsaraDB RDS instances.After the public preview,this feature is generally available.General available date ...
You can check I/O statistics and I/O latency distribution by using the polar_stat_io_info and polar_stat_io_latency views.Note To use the polar_stat_io_info and polar_stat_io_latency views,you need to create the polar_...
An I/O hang occurs when the system becomes unstable or even goes down due to time-consuming I/O requests.To accurately detect I/O hangs,Alibaba Cloud Linux 2 and Alibaba Cloud Linux 3 extend the core data structures to ...
An I/O hang occurs when the system becomes unstable or even goes down due to time-consuming I/O requests.To accurately detect I/O hangs,Alibaba Cloud Linux 2 and Alibaba Cloud Linux 3 extend the core data structures to ...
Storage type Formula for actual maximum I/O bandwidth(Unit:MB/s,Storage capacity unit:GB)Premium ESSD With I/O performance burst enabled min{Maximum I/O bandwidth for the instance type,4000} With I/O performance burst ...
实例存储IOPS性能说明 当您创建ECS实例挂载了云盘时，ECS实例最终的存储I/O性能表现有以下场景：场景一：如果云盘的性能总和超过了实例规格族所对应的存储I/O能力，最终存储I/O性能以该实例规格所对应的存储I/O能力为准。挂载多个云盘时，...
Problem description The website or application hosted on the Elastic Compute Service(ECS)instance responds slowly,times out,or I/O-related error logs appear.The IOPS,throughput,or device utilization(%util)metrics for the ...
Starting March 20,2025,I/O performance-related enhanced metrics are supported to improve the accuracy of IOPS and I/O bandwidth monitoring for ApsaraDB RDS for PostgreSQL instances that use dedicated instance types.This ...
This topic describes how to troubleshoot the issues that cause high I/O on an ApsaraDB RDS for MySQL instance.The I/O performance of your RDS instance varies based on the storage type,kernel architecture,and SQL statement ...
If the disk I/O becomes a performance bottleneck of your ApsaraDB RDS for PostgreSQL instance,you can use the I/O acceleration feature to resolve the performance bottleneck.This topic describes the benefits,scenarios,and ...
000 I/O operations.If the number of I/O operations is lower than 10,000,the fee is calculated as if 10,000 I/O operations were performed.Procedure Enable the I/O burst feature when you create a PolarDB for MySQL cluster Go...
effective.General ESSDs use high performance disks as scalable resources to increase I/O rates.General ESSDs use AliSQL to respond to I/O bursts during database reads and writes.Data that is infrequently accessed is ...
2 系统将请求通信对象递交给I/O线程，并在I/O线程中完成编码。3 编码完成后，将内容传递到服务提供方的I/O线程。客户端线程会等待结果返回。4 服务提供方的I/O线程接收到二进制内容，解码后生成通信请求对象，并将其递交给HSF服务端线程。5...
背景信息 ⼀般云数据库厂商为了避免宿主机出现I/O争抢，会使⽤CGroup（Control Groups）等技术进⾏实例间的I/O隔离和IOPS（Input/Output Operations Per Second）限制，即不同规格的实例配置对应不同的IOPS使⽤上限。注意事项 MongoDB单...
I/O acceleration,and data archiving features.I/O acceleration After you enable the I/O acceleration feature,the system expands the size of the buffer pool of your RDS instance.This accelerates caching and improves the read...
This topic describes I/O performance optimization of DDL statements.PolarDB uses the compute and storage decoupled architecture.Compute nodes use high-performance RDMA to access distributed storage.However,the latency of ...