The 4.x TSA is an in-memory data platform, providing faster, more consistent, and more predictable access to data. With resource management, if you have more data than memory available, the TSA protects itself from going over its limit through data eviction and throttling. In most cases, it will recover and come back to its normal working state automatically. In addition, four systems are available to protect data: the Fast Restart (FRS) feature, BigMemory Hybrid's use of SSD/Flash, active-mirror server groups, and backups.

BigMemory's Fast Restart (FRS) feature is now integrated into the TSA, providing crash resilience with quick recovery, plus a consistent record of the entire in-memory data set, no matter how large. For more information about FRS, see Fast Restartability.

"BigMemory Hybrid" extends BigMemory distributed in a Terracotta Server Array so that data can be stored across a hybrid mixture of RAM and SSD/Flash. This additional storage is managed with the in-memory data as one TSA data set. For more information, see Using BigMemory Hybrid.

Resource management provides better control over the TSA's in-memory data through time, size, and count limitations. This enables automatic handling of, and recovery from, near-memory-full conditions. For more information, see Automatic Resource Management.

Based upon user-configured time, size, and count limitations, the TSA's 3-pronged eviction strategy works automatically to ensure predictable behavior when memory becomes full. For more information, see Eviction .

Improvements to provide continuous availability of data include flexibility in server startup sequencing, better utilization of extra mirrors in mirror groups, multi-stripe backup capability, optimizations to bulk load, and performance improvements for data access on rejoin. In addition, the TSA no longer uses Oracle Berkeley DB, enabling in-memory data to be ready for use much more quickly after any planned or unplanned restart.

The expanded TMC replaces the Developer Console and Operations Center as the integrated platform for monitoring, managing, and administering all Terracotta deployments. There is also support for additional REST APIs for management and monitoring. For more information, start with the Terracotta Management Console User's Guide.

Active Directory (AD) and Lightweight Directory Access Protocol (LDAP) support on Terracotta servers, and custom SecretProvider on Terracotta clients. For more information, see the BigMemory Max Security Guide.

DSO configuration has been deprecated, and the tc-config has a new format. Most of the elements are the same, but the structure is revised. For more information, see the BigMemory Max Administrator Guide.