Andreas, thanks for the explanation about the Berkeley Database. However, I have made several changes of permissions and owner of the files produced by mapcache_seed, and I still get the same error on the OpenLayers demo.
I don't know if others users have had the same error with Mapcache and Berkeley Databases in Ubuntu Server. Thanks again, Samuel. 2014/1/23 Eichner, Andreas - SID-NLKM <andreas.eich...@sid.sachsen.de> > > Thanks Andreas for your response. I changed all the permissions to > > read, write and the owner, after restarting apache, it fails > > displaying tiles in the demo and report the same error: > > > > "failed to aquire connection to bdb backend: unknown error" > > > > I followed the instructions to check the database created with db_sql > > according to [1] but I get the same error: > > > > > db5.1_sql ortofoto.db > > > > "ortoforo.db: multiple databases specified but not supported by file" > > "Error: file is encrypted or is not a database" > > > > I have little knowledge of this type of database, but I would to > > evaluate the loading speed of tiles. > > It seems there is a misunderstanding of the usage of Berkley DB. BDB is a > library implementing a key/value store and is quite flexible in what can be > used as key and value. > And that's the way MapCache uses it. The key is a string representing > tileset, zoomlevel and any used dimension but at least (x, y) and the value > is the image BLOB. So there will be a single BDB cache stored in a > directory (because BDB uses multiple files) for all tilesets configured to > use this cache. > The error message you got is a mixed result of BDB (1st: "multiple ...") > and SQLite (2nd: "file is encrypted..."). This is a new feature since > Oracle Berkeley DB 11g. It combines the flexibility of the SQLite database > engine with the strengths of the BDB used as storage backend. See [1] for > more info on that. > Although both use-cases use BDB as backend they are in fact completely > different and cannot be mixed together. So you cannot use dbsql to inspect > the tilecache. You have to use mapcache_seed to manipulate it (seed/reseed, > clean). > > HTH > > [1] > http://www.oracle.com/technetwork/database/berkeleydb/overview/sql-160887.html > -- --- .~. / v \ // \\ /( )\ ^`~'^
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