| Billing Method |
- Subscription: A subscription instance is an instance that you can subscribe to for a specified
period of time and pay for up front. Subscription billing is more cost-effective than
pay-as-you-go billing. Therefore, we recommend that you select subscription billing
with a longer commitment. You can receive larger discounts for longer subscription
periods.
- Pay-As-You-Go: A pay-as-you-go instance is charged per hour based on your actual resource usage.
We recommend that you select pay-as-you-go billing for short-term use. If you no longer
need your pay-as-you-go instance, you can release it to reduce costs.
Note A maximum of 30 pay-as-you-go RDS instances are allowed per Alibaba Cloud account.
To increase this quota, you must submit a ticket.
|
| Region |
The region to which the RDS instance belongs.
- After you confirm the purchase order, you cannot change the selected region.
- We recommend that you select a region that is in close proximity to the geographic
location where your users reside. This allows you to increase the access speeds of
your users.
- The RDS instance must reside in the same region as the ECS instance that you want
to connect. If the RDS and ECS instances reside in different regions, these instances
cannot communicate over an internal network. In this case, these instances must communicate
over the Internet and therefore cannot deliver optimal performance.
|
| Database Engine |
The database engine and version that the RDS instance runs. Select MariaDB. Only MariaDB 10.3 is supported.
Note The available database engines and versions vary based on the selected region.
|
| Edition |
The RDS edition of the RDS instance. Select High-availability. If you select the RDS High-availability Edition, the database system consists of
a primary RDS instance and a secondary RDS instance. The primary RDS instance and
the secondary RDS instance work in the high-availability architecture.
|
| Storage Type |
- ESSD PL1: This option represents an enhanced SSD of PL1.
- ESSD PL2: An enhanced SSD of PL2 delivers IOPS and throughput that are twice higher than those
delivered by an enhanced SSD of PL1.
- ESSD PL3: An enhanced SSD of PL3 delivers IOPS that is 20 times higher than the IOPS delivered
by an enhanced SSD of PL1. It also delivers throughput that is 11 times higher than
the throughput delivered by an enhanced SSD of PL1. Enhanced SSDs of PL3 are suitable
for workloads that require high I/O performance to process concurrent requests. Enhanced
SSDs of PL3 are also suitable for workloads that require stable read/write latency.
For more information, see Storage types.
|
| Zone of Primary Node and Zone of Secondary Node |
A zone is an independent physical location within a region. The Zone of Primary Node parameter specifies the zone to which the primary RDS instance belongs. The Zone of Secondary Node parameter specifies the zone to which the secondary RDS instance belongs.
You can select the Single-zone Deployment or Multi-zone Development method.
- Single-zone Deployment: If you select this deployment method, the Zone of Primary Node and the Zone of Secondary Node are the same.
- Multi-zone Development: This is the recommended deployment method. If you select this deployment method,
the Zone of Primary Node and the Zone of Secondary Node are different. This allows you to provide zone-level disaster recovery. You must
manually specify the Zone of Primary Node and the Zone of Secondary Node.
Note
- After the RDS instance is created, you can view information about the RDS instance
and its secondary RDS instance on the Service Availability page.
- If you select the RDS Basic Edition, the database system consists of only one primary
RDS instance and supports only the single-zone deployment method.
|
| Instance Type |
- General-purpose (Entry-level): belongs to the general-purpose instance family. A general-purpose instance exclusively
occupies the allocated memory and I/O resources. However, it shares CPU and storage
resources with the other general-purpose instances that are deployed on the same server.
- Dedicated Instance (Enterprise-level): belongs to the dedicated instance family or the dedicated host instance family.
A dedicated instance exclusively occupies the allocated CPU, memory, storage, and
I/O resources. The dedicated host instance family is the top configuration of the
dedicated instance family. A dedicated host instance exclusively occupies all the
CPU, memory, storage, and I/O resources on the server where it is deployed.
- Dedicated: A dedicated cluster exclusively occupies all the resources on a VM or physical host.
The permissions to manage hosts in a dedicated cluster can be authorized to you. This
allows you to create multiple database instances on a host. For more information,
see Add hosts.
Note Each instance type supports a specific number of CPU cores, memory capacity, maximum
number of connections, and maximum IOPS. For more information, see Primary instance types.
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| Capacity |
The storage capacity that the RDS instance has available to store data files, system
files, binary log files, and transaction files. You can adjust the storage capacity
in increments of 5 GB.
Note The dedicated instance family provides exclusive resources. Therefore, the storage
capacity of each instance type with local SSDs in this family is fixed. For more information,
see Primary ApsaraDB RDS instance types.
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