Verifying Backend Data

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Dear Duplicati authors,

analysis of user RGupta is correct and issue of “Verifying Backend Data” is not resolved in 2.0.4.17 build.

What is recommended to be changed is:
a)
create index i1 on BlocklistHash(Hash);

b) LocalDatabase(1301) issue commands:
PRAGMA optimize;
ANALYZE sqlite_master;
ANALYZE Block;
ANALYZE BlocklistHash;
ANALYZE BlocksetEntry;

c) in LocalDatabase.cs(1304):
var sql = string.Format(@“SELECT ““A””.”“Hash”", ““C””."“Hash”" FROM " +
@"(SELECT bb1."“BlocksetID”", bb2."“Hash”", * FROM ““BlocklistHash”” bb1,"“Block”" bb2 WHERE bb1."“Hash”" = bb2."“Hash”" AND bb2."“VolumeID”" = ?) A, " +
@" ““BlocksetEntry”” B, ““Block”” C WHERE ““B””."“BlocksetID”" = ““A””."“BlocksetID”" AND " +
@" ““B””."“Index”" >= ("“A”"."“Index”" * {0}) AND ““B””."“Index”" < (("“A”"."“Index”" + 1) * {0}) AND ““C””."“ID”" = ““B””."“BlockID”" " +
@" ORDER BY ““A””."“BlocksetID”", ““B””."“Index”"",
blocksize / hashsize

My development laptop has over 10 million local files.
Even in 2.0.4.17 “Verifying Backend Data” takes over 24 hours before I kill service.
With changes it takes fraction of a second.

Thanks

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