AWS RDS Maintenance
Check the database parameters of cloud database
max_connections=4000 #But when the actual number of connections reaches 800, it cannot be accessed
VPC：
Logical virtual network with free configuration of IP, subnets, routing tables and gateways
Provides advanced security features such as Secure Combination Network Access Control Lists
Overview of Amazon RDS
1. Get CPU, Memory, Storage and IOPS
2, can manage backup, software patching, automatic failure detection and recovery
3. High availability is achieved through the primary instance and the synchronized secondary instance to which a failover operation can be performed in the event of a problem, and the read replica extends the read
Types of RDS databases:
Amazon Aurora: MySQL and PostgreSQL Compatible Relational Database
Amazon RDS：Amazon Aurora、Oracle、Microsoft SQL Server、PostgreSQL、 MySQL 和 MariaDB。
Amazon DynamoDB：mongodb
Amazon Redshift: Petabyte-scale data warehouse
Amazon ElastiCache：redis和memcache
Amazon Neptune: Graph Database
AWS DMS: Data migration, which supports homogeneous migration (such as from Oracle to RDS for Oracle), and also supports heterogeneous migration between different database platforms (such as from Oracle to Amazon Aurora or from Microsoft SQL Server to RDS for Oracle) MySQL).
You can create and modify DB instances using the AWS Command Line Interface, the Amazon RDS API, or the AWS Management Console.
Each database engine has a set of parameters in the database parameter group that control the behavior of the databases it manages
DB instance class type
The following are the standard database instance classes available:
db.m4 – The latest generation of instance classes that provide more computing capacity than the previous db.m3 instance classes at a lower price.
db.m3 - The previous generation instance classes, which take into account compute, memory, and network resources, are ideal for many applications. The db.m3 instance class provides more computing capacity than the previous db.m1 instance class.
db.m1 – previous generation generic instance class.
The following are the available memory-optimized DB instance classes:
db.r4 – Current generation instance classes that are optimized for memory-intensive applications and offer RAM per GiB at a lower price than db.r3 instance classes.
db.r3 – The previous generation instance classes, which provide memory optimizations and provide more compute capacity than the db.m2 instance classes at a lower price. db.r3 instance classes are not available in the South America (Sao Paulo) Region.
db.m2 – previous generation memory-optimized instance classes.
The following are the available burstable performance DB instance classes:
db.t2 – Instance class that provides baseline performance levels and can burst to full CPU usage.
https://docs.aws.amazon.com/zh_cn/AmazonRDS/latest/UserGuide/Concepts.DBInstanceClass.html
Modify the database instance running the MySQL database engine
After you modify DB instance settings, you can apply the changes immediately or during the next maintenance window for the DB instance. Some modifications cause outages by restarting the database instance.
When you modify a DB instance, Amazon RDS will restart the instance if both of the following are true:
You change the DB instance class.
You specify a custom parameter group.
RDS option group: add plugins, generally default
RDS parameter group: used to configure the parameters in the instance
Settings for MySQL DB Instances
https://docs.aws.amazon.com/zh_cn/AmazonRDS/latest/UserGuide/USER_ModifyInstance.MySQL.html
Some modification operations affect the running of the instance:
Allocated storage space
Automatic minor version upgrade
Backup Retention Period If you change from 0 to a non-zero value or from a non-zero value to 0, a service interruption will occur.
backup period
Certificate Authority
Copy tags to snapshots
Database port The database instance is restarted immediately.
The database engine version (there are two ways to upgrade: major version upgrade and minor version upgrade) A service outage occurred during this change.
DB instance classes (standard, memory-optimized, and burstable performance) experienced a service outage during this change.
DB instance identifier A service outage occurred during this change. The database instance restarts.
DB Parameter Groups There will be no disruption during this change. However, parameter changes only occur when the DB instance is manually restarted without failover.
Enhanced monitoring
IAM database authentication
Maintenance Window If one or more pending operations cause an outage, and the maintenance window is changed to include the current time, those pending operations are applied immediately with an outage.
Multi-AZ deployment
New master password
option group
public availability
security group
subnet group
Storage type May be interrupted
Changed from General Purpose (SSD) to Magnetic.
Changed from Magnetic to General Purpose (SSD).