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InstantDB: InstantDB query


Hi,
I have certain queries regarding Instantdb
1) If I drop the table from the database, why does the tbl file still exit
in the table folder. Is the space occupied by the deleted table ever freed?
2) If  I reduce the number of entries from the table from 10,000 to 1,000
why does the file size of the tbl file remain the same. Does InstantDB
consume alot of memory?
3) How Efficient are the table indexes? Is it wise not to use the index for
small database as more overheaded is involved, reducing the speed? If yes
when is it appropriate to use indexes, what database size range?

Greatly appreciate the help.
Thanks,
Bhavna 
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