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show variables like 'tx_isolation'; --------------- ----------------- | Variable_name | Value | --------------- ----------------- | tx_isolation | REPEATABLE-READ | --------------- ----------------- 1 row in set (0.00 sec) show processlist\G ************************* 1.

row ************************* Id: 255867 User: root Host: localhost db: snsfeed Command: Query Time: 1 State: Updating Info: update activity_test set ACT_TYPE = 105 limit 10 ************************* 2.

Amazon RDS uses that DB subnet group and your preferred Availability Zone to select a subnet and an IP address within that subnet to associate with your DB instance.

If the primary DB instance of a Multi-AZ deployment fails, Amazon RDS can promote the corresponding standby and subsequently create a new standby using an IP address of the subnet in one of the other Availability Zones.

row ************************* Id: 255962 User: root Host: localhost db: snsfeed Command: Query Time: 4 State: Copying to tmp table Info: create table activity_test_stat as select act_type, My SQL Inno DB 스토리지 엔진의 기본 Isolation Level이 REPEATABLE-READ로 설정되어 있기 때문에 발생합니다. into Select 경우 Isolation Level을 READ-COMMITED나 READ-UNCOMMITED로 변경하여 해결할 수 있습니다.

REPEATABLE-READ에서는 현재 Select 버전을 보장하기 위해 Snapshot을 이용하는데, 이 경우 해당 데이터에 관해서 암묵적으로 Lock과 비슷한 효과가 나타납니다. 다음과 같이 세션 설정을 변경 후 Create Table As Select, Insert into Select를 수행하면 문제가 없습니다. (설정 자체가 READ COMMITTED에서는 발생하지 않음) ※ 주의사항 ※ 커넥션 풀을 사용하는 경우 변경된 세션 값은 해당 커넥션이 재 시작되기 전까지 유지되므로, 반드시 사용 후 원래 설정 값으로 돌려놓아야 합니다. 그러나 유독 My SQL에만 국한되는 내용이 아닌, 트랜잭션을 지원하는 DB 사용 시 반드시 알아야할 사항이라고 생각됩니다.

For an illustration of this scenario, see A DB Instance in a VPC Accessed by an EC2 Instance in the Same VPC.

When you launch a DB instance inside a VPC, you can designate whether the DB instance you create has a DNS that resolves to a public IP address by using the parameter.

A DB subnet group allows you to specify a particular VPC when creating DB instances using the CLI or API; if you use the console, you can just select the VPC and subnets you want to use.

For more information, see the modifying section for your DB engine.

The following illustration shows the Public accessibility option in the Launch DB Instance Wizard.

This parameter lets you designate whether there is public access to the DB instance.

Note that access to the DB instance is ultimately controlled by the security group it uses, and that public access is not permitted if the security group assigned to the DB instance does not permit it.

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Amazon EC2 instances that function as web servers can be deployed in the public subnet, and the Amazon RDS DB instances are deployed in the private subnet.