# Special upgrade to Database 6.3.0

Aerospike Database 6.3.0 gates the following server features with a feature key: XDR, index in Flash (All Flash), Vault integration, and Rack Awareness.

-   New feature-key files with these explicit entitlements have been reissued to existing customers through their portal.
-   If you are a current Enterprise Edition customer, check that your feature-key file has these feature keys before you upgrade to Database 6.3.0 or later.
-   The new feature-key files are compatible with server versions 5.4.0 and later that use feature key version 2.

| Feature Key | Functionality | Notes |
| --- | --- | --- |
| `asdb-flash-index` | Flash index (Flash sindex) | Ability to configure [`index-type`](https://aerospike.com/docs/database/reference/config#namespace__index-type) to flash |
| `asdb-xdr` | XDR | Distinct from the `asdb-change-notification` feature-key, which is needed to set [`connector=true`](https://aerospike.com/docs/database/reference/config#xdr__connector). |
| `asdb-vault` | Vault integration | Ability to fetch configuration from `vault:` or configure [`vault-url`](https://aerospike.com/docs/database/reference/config#service__vault-url) |
| `asdb-rack-aware` | Rack Awareness | Ability to deploy rack-aware clusters |

## Important pre-upgrade considerations

::: tip
Always review the special upgrade instructions of the interim server releases between the current version of your cluster and the target version.
:::

-   Before you upgrade from Database 4.9.0 or 5.x.y.z, follow the instructions in [Storage Format Upgrade in 6.0.0 Release](https://aerospike.com/docs/database/advanced/special-upgrades/600-upgrade).
-   Back up `/opt/aerospike/smd/security.smd` in your system metadata (SMD) [Directory Structure](https://aerospike.com/docs/database/manage/database/directory-structure#run-time-directories) and `aerospike.conf`, the Aerospike configuration file.
-   Find and fix any secondary index (sindex) names that are longer than 64 characters. See [Upgrade to Database 6.1.0](https://aerospike.com/docs/database/advanced/special-upgrades/610-upgrade).

## Changes and updates

For information about new features, breaking changes, and late breaking news, see the [Database 6.3.0 release notes](https://aerospike.com/docs/database/advanced/special-upgrades/630-upgrade).