Memory Management
Informix XPS shared memory includes internal tables, buffers, session data, thread data, the dictionary cache, and various memory pools. The main consumers of XPS shared memory within a coserver are the buffer pool and the DS memory pool. In this section we explore both of these memory pools and examine the way in which XPS dynamically allocates shared memory.
Buffer Pool
Apart from pages read during a DSS query, database pages are read into the Informix buffer pool, which uses a configurable number of least recently used (LRU) queues. Two types of LRU queues are maintained by XPS:
A free least recently used (FLRU) list, which identifies unmodified pages in the buffer pool.
A modified least recently used (MLRU) list, which ...
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