--- title: "Aerospike Database 6.1.0.21 Release Notes" description: "Aerospike Database 6.1.0.21 release notes covering performance improvements, known issues, and tool updates." --- # Aerospike Database 6.1.0.21 Release Notes > For the complete documentation index see: [llms.txt](https://aerospike.com/docs/llms.txt) > > All documentation pages available in markdown. September 29, 2023  |  **[Download](https://aerospike.com/download/)** ## Improvements - Enterprise & Federal Only - AER-6681 - (FABRIC) Improved performance of fabric when using TLS. - AER-6673 - (MIGRATION) Limit outstanding migration metadata to ~32MiB per incoming migration. \[Note: this introduced an issue fixed in AER-6691.\] ## Known Issues - If you use `equality` secondary index queries that return a small number of records, you may see a latency increase in Database 6.0.0-6.2.0. The [`inline-short-queries`](https://aerospike.com/docs/database/reference/config#namespace__inline-short-queries) configuration option provides a partial fix in Database 6.3.0, and a more advanced fix is scheduled for Database 6.4.0. - If your secondary index query only returns 0 records or 1 record, meaning that it is acting as a unique index, you should consider converting such a query to a get/exists operation by creating a self-managed reverse index (lookup table). - Spark Connector version 3.5 starts using batch writes when possible, a feature which was introduced in Aerospike Database 6.0.0. Consult the Spark Connector [rate limiting documentation](https://aerospike.com/docs/connectors/spark/rate-limiting#set-rate-quotas-in-the-spark-application) before you upgrade the server. Pay attention to throttling write throughput, and use Spark Connector 3.5.5 or later, which fixes throttling behavior to conform to the `aerospike.transaction.rate`. - There is a possibility of partial de-duplicate (repeated records) in secondary index query (SI query) responses for SI queries that use list or map type secondary indexes. Any record that satisfies such a query at least once will be included, but it is possible and normal to see a record more than once. - [Known issues for 6.1.0.21](https://aerospike.com/docs/database/reference/issues?search=6.1.0.21) ## Updates [Aerospike Tools 8.0.4](https://aerospike.com/docs/database/tools/release-notes/#tools-804)