This update improves the supportability of SQL Server 2014 by adding informational messages for tempdb configuration to the SQL Server error log. After you install this update, an informational message that resembles the following is logged in the SQL Server error log at SQL Server startup:
The tempdb database has %ld data file(s).
Additionally, when there are multiple tempdb data files, if the tempdb data files do not have the same initial size or autogrowth size, an informational message that resembles the following is logged in the SQL Server error log:
The tempdb database data files are not configured to use the same initial size and autogrowth settings. To reduce potential allocation contention, the initial size and autogrowth of the files should be same.
The equal sizing of data files is important because the proportional fill algorithm is based on the size of the files. If data files are created with unequal sizes, the proportional fill algorithm tries to use the largest file more for GAM allocations instead of spreading the allocations between all the files. This defeats the purpose of creating multiple data files.
Service packs are cumulative. Each new service pack contains all the fixes that are in previous service packs, together with any new fixes. Our recommendation is to apply the latest service pack and the latest cumulative update for that service pack. You do not have to install a previous service pack before you install the latest service pack. Use Table 1 in the following article for finding more information about the latest service pack and latest cumulative update.