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ECU details

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Elastic compute units (ECUs) are the basic computing units for AnalyticDB for MySQL instances. An ECU consists of a specific amount of memory and disk capacity.

AnalyticDB for MySQL provides two types of ECUs: High-performance and Large storage.

  • High-performance: ECUs with names that start with C or H are high-performance instances. All data on these instances is stored on SSDs.

    These instances are ideal for scenarios that require high performance and high query concurrency.

  • Large storage: ECUs with names that start with S are large storage instances. They use a tiered storage architecture of SSD and HDD. Hot data is stored on SSDs, and cold data is stored on HDDs.

    These instances are suitable for scenarios that have lower concurrency and do not require high performance. These scenarios can tolerate a query response time of more than 10 seconds.

ECU specifications

High-performanceC430 GBSSD180 GB-
C845 GBSSD480 GB-
H8160 GBSSD2 TB-
Large storage
S2N (S2)45 GBSSD+HDD480 GB2 TB
S8N120 GBSSD+HDD1 TB8 TB

Notes

  • By default, AnalyticDB for MySQL stores data in two replicas. The total data volume that a database can store is calculated using the following formula: Number of ECUs × ECU disk capacity / 2.
  • The purchase limits for ECUs, including per-order and total limits, vary by ECU type.
  • Each database is limited to a total of 12 scale-out, scale-in, upgrade, or downgrade operations per day.