SORT_SPACEMAP_SIZE
Values:Operating system dependent
Default:Operating system dependent
Sets the size, in bytes, of the sort space map. This parameter should be changed only when very large indexes exist. In most cases, a sort automatically increases its space map when necessary, but it does not necessarily do so when it will make best use of disk storage. The sort makes optimal use of disk storage when the parameter is set to the following value:
((total_sort_bytes) / (SORT_AREA_SIZE)) + 64 |
where total_sort_bytes is:
number_of_records × (sum_of_average_column_sizes |
+ (2 × number_of columns)) |