This PR adds a test that generates a synthentic filelist of a variable size, and then measures the time it takes to recreate the fileset.
As there was a reported slowdown, analysis indicated that the query would grow in the order of O=N^2, where N is the number of paths.
The code is then updated to instead use some temporary on-disk space to lay out the paths and then insert them as a new fileset. This should bring the time down to O=N.
Based on a test with 10k files, the query speed up is ~900x, but will be more on larger filesets.
This PR adds guards to prevent creating filesets with multiple files that have the same path.
While it should technically be impossible to have multiple entries that have the same path, it could happend either due to glitches or because the source data (manual lists, remote sources, etc) returns duplicates.
This PR adds a simple check for each folder to ensure that on a folder-level, duplicate paths cannot be introduced.
There is also a post-backup check to evict any duplicates, and the recreate process will reject duplicate paths.
Finally, the repair command will remove duplicates if they somehow manage to get into the database anyway.
A database-level prevention is not currently feasible as it needs a cross-table check for uniqueness, which requires more work from the database to check for each added file. Since this is expected to be a very rare event, the added processing was not justified.
This adds an extra option to allow setting the SQLite page cache size as a regular option.
Prior to this commit it was only possible to set the SQLite page cache size via environment variables.
The option to use environment variables is preserved, and as options from the environment variable are applied after the new setting, environment variables take precedence.
The default value for the new option is to use 1% of the system memory for the page cache. For the restore process, a connection per worker may be made which defaults to half the number of cores, so the maximum amount of memory is 1% * half the CPU cores.
This is just the upper limit, and SQLite may choose not to use all of it.
This fixes#6178
Kenneth Skovhede