Comparison between shared instances and exclusive instances
Shared instances are highly cost-effective. You can share resources with others. This type of instance is applicable to scenarios that require lightweight storage and computing resources.
Exclusive instances provide exclusive resources and support more algorithm optimization features. These instances are suitable for scenarios that require a large amount of storage and computing resources and a high-quality search service.
Price comparison
Fees for shared instances are slightly different from those for exclusive instances. The fees displayed on the buy page of the instance prevail.
Comparison of limits on configurations
Feature | Item | Shared instance | Exclusive instance |
Search | Maximum length of each clause, except FILTER clauses | 1 KB before encoding | Customizable. If you want to customize this setting, you must contact Alibaba Cloud technical support. |
Maximum length of each FILTER clause | 4 KB before encoding | Customizable. If you want to customize this setting, you must contact Alibaba Cloud technical support. | |
Maximum number of results retrieved by a search | 5,000 | Customizable. If you want to customize this setting, you must contact Alibaba Cloud technical support. | |
Number of documents that are roughly sorted | 1,000,000 | Customizable. If you want to customize this setting, you must contact Alibaba Cloud technical support. | |
Number of documents that are finely sorted | The default number is 200. | Customizable. If you want to customize this setting, you must contact Alibaba Cloud technical support. | |
Accurate statistics by AGGREGATE clauses | Accuracy is ensured for less than 100,000 documents. | Accuracy can be ensured even for more than 100,000 documents. (Note: the KVPAIRS clause must contain enable_accurate_statistics:true, which is used to enable accurate statistics.) | |
Sort policy | Sort policy configuration | Rough sort and fine sort | Rough sort and fine sort |
Type of rough sort | Weight expression | Weight and formula expressions | |
Maximum number of sort policies | 30 | 50 | |
Advanced custom sort plug-in Cava | Not supported | Supported. | |
Application schema | Correlation levels of primary and secondary tables | Up to two levels | Up to three levels |
Instance creation and scaling | Creation | You can directly create an instance. | You must create an instance separately. If you create more instances than the quota for automatic deployment sets, contact technical support. |
Scaling | Flexible scaling | You must create an instance separately. If you create more instances than the quota for automatic deployment sets, contact technical support. | |
Industry-specific enhanced edition | Industry Algorithm Edition for e-commerce | Not supported | You can upgrade Industry Algorithm Edition for e-commerce free of charge. |
Industry Algorithm Edition for education | Not supported | You can upgrade Industry Algorithm Edition for education free of charge. | |
Industry Algorithm Edition for games | Not supported | You can upgrade Industry Algorithm Edition for games free of charge. | |
Industry Algorithm Edition for content community | Not supported | You can upgrade Industry Algorithm Edition for content community free of charge. |
Performance comparison
Feature | Item | Shared instance | Exclusive instance |
Data synchronization | Total data size of API requests per second | 2 MB/s | The default total data size of API requests per second is 15 MB. If you want to customize this setting, contact Alibaba Cloud technical support. |
Maximum rate for synchronizing incremental data from ApsaraDB RDS and PolarDB data sources | 2 MB/s | The default total data size of API requests per second is 15 MB. If you want to customize this setting, contact Alibaba Cloud technical support. | |
Maximum transactions per second (TPS) for updates on primary tables including the updates triggered by secondary tables | 1,500 | Customizable. If you want to customize this setting, you must contact Alibaba Cloud technical support. | |
Retrieval | Execution time | Milliseconds | Milliseconds |
Quotas for automatic deployment of different types of exclusive instances: The quota for general-purpose exclusive instances is 150 GB and 2,000 logical computing units (LCUs). The quota for compute-optimized exclusive instances is 120 GB and 3,000 LCUs. The quota for storage-optimized exclusive instances is 750 GB and 1,500 LCUs. If the quotas are exceeded, contact technical support.
Comparison between exclusive instances of General-purpose Edition and Industry-specific Edition
Comparison between General-purpose Edition and Industry Algorithm Edition for e-commerce
Comparison between General-purpose Edition and Industry Algorithm Edition for education
Comparison between General-purpose Edition and Industry Algorithm Edition for games
Comparison between General-purpose Edition and Industry Algorithm Edition for content community