cubicweb #2509722 db-dump --portable should allow blocksize configuration [open]
The DatabaseIndependentBackupRestore class hardcodes number of records used by executemany to dump / pickle the records (i.e. 2000 for cw entities). Some records happen to store huge blobs which makes 2000 records too big to fit into memory.
A new command line option could be added to configure blocksize.
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