Q&A on Maximum NPI Size
flodubois 270000K6H5 Visits (2988)
Q. If PIECESIZE is specified at maximum of 64GB and (LARGE or DSSIZE x is specified on tablespace), then is the maximum pageset size going to be 64GB*4096 parts =256TB?
A. The number of index data sets is influenced by the number of data partitions. Initially using PIECESIZE of 64GB you could not index 128TB of data using DSSIZE 128 GB or 256 GB due to the reduced number of index data sets. APAR PM42175 was created to allow the specification of 128 GB and 256 GB PIECESIZE.
Specification of 64GB is only allowed when the number of data partitions (derived from DSSIZE) is less than the following maximum data parts.
Chart for 128GB PIECESIZE
Chart for 256GB PIECESIZE
Q. Now that DB2 can support a DSSIZE of 256GB for tablespace what is the new max size for the NPI?
Q. Is the only way to influence it - by increasing DSSIZE for the tablespace?
Q. Is there a way to calculate how much is space is actual used/left to grow based on the Catalog or RTS?