When starting, the PPM analysis server can use only the amount of main memory that was specified in the client properties. If this limit is reached, out-of-memory exceptions occur. These memory errors can result in analysis server instability which is a critical issue during data import. They can also result in differences between analysis and client server data, which requires a reinitialization of the analysis server. Reinitialization of the analysis server should, however, be avoided because it can take up to several hours with large data volumes. Analysis server performance also drops with high memory load through frequent internal administration tasks (garbage collection).