Roman Simakov wrote 06.10.2021 21:49:
How are data moved?
Under transaction control?
In background (and interruptible) like db crypt?
it's a dfw operation with EX database lock. I hope to relax this
limitation later. So there are no concurrent changes.
1) copy all data pages
2) switch RDB$POINTER_PAGE and RDB$ROOT_PAGE transactionally
3) Rebuild RDB$PAGES
4) clear old data pages (as post-dfw operation)
It can be interrupted but not resumed. I'm afraid it starts from the beginning.
I guess it's better to discuss in a context of PR.
Tablespaces has meaning for large databases only that don't fit into single
storage (terrabytes). For such volumes this algorithm is no-go. Better not to
have move option in the initial implementation at all.
--
WBR, SD.
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