Replication Server 15.5 supports 64-bit computing platforms, which provide Replication Server with a large amount of virtual memory space and removes the maximum memory constraint of 2GB. In addition, all the available Replication Server counters are now defined as 64-bit, which allows high-precision computations in Replication Server.
Table 1-13 describes changes to certain configuration parameters that impact performance on 32-bit Replication Server and 64-bit Replication Server.
Parameter |
Description |
Valid range for 32-bit (in bytes) |
Valid range for 64-bit (in bytes) |
|---|---|---|---|
dsi_sqt_max_cache_size |
The maximum Stable Queue Transaction (SQT) cache size for the database connection. The default, 0, means the current setting of the sqt_max_cache_size parameter is used as the maximum cache size for the connection. |
Min: 0 Max: 2147483647 |
Min: 0 Max: 2251799813685247 |
dist_sqt_max_cache_size |
The maximum Stable Queue Transaction (SQT) cache size for the DIST connection. The default, 0, means the current setting of the sqt_max_cache_size parameter is used as the maximum cache size for the connection. |
Min: 0 Max: 2147483647 |
Min: 0 Max: 2251799813685247 |
sqt_max_cache_size |
Maximum SQT interface cache memory, in bytes. |
Min: 0 Max: 2147483647 |
Min: 0 Max: 2251799813685247 |
Table 1-14 describes changes to the memory_limit configuration parameter that impacts performance on 32-bit Replication Server and 64-bit Replication Server.
Parameter |
Description |
Valid range for 32-bit |
Valid range for 64-bit |
|---|---|---|---|
memory_limit |
The maximum total memory the Replication Server can use, in megabytes.Values for several other configuration parameters are directly related to the amount of memory available from the memory pool indicated by memory_limit. These include fstr_cachesize, md_source_memory_pool, queue_dump_buffer_size, sqt_max_cache_size, sre_reserve, and sts_cachesize. |
Min: 0 Max: 2047 |
Min: 0 Max: 2147483647 |
See Chapter 3 “Upgrading or Downgrading Replication Server” in the Replication Server Configuration Guide to migrate to 64-bit platforms and Chapter 4, “Performance Tuning” in the Replication Server Administration Guide Volume 2 to configure support for 64-bit platforms.
