mdb_put (3)

#define MDB_NOOVERWRITE 0x10

For put: Don't write if the key already exists.

#define MDB_NODUPDATA 0x20

Only for MDB_DUPSORT

For put: don't write if the key and data pair already exist.

For mdb_cursor_del: remove all duplicate data items.

#define MDB_CURRENT 0x40

For mdb_cursor_put: overwrite the current key/data pair

#define MDB_RESERVE 0x10000

For put: Just reserve space for data, don't copy it. Return a pointer to the reserved space.

#define MDB_APPEND 0x20000

Data is being appended, don't split full pages.

#define MDB_APPENDDUP 0x40000

Duplicate data is being appended, don't split full pages.

#define MDB_MULTIPLE 0x80000

Store multiple data items in one call. Only for MDB_DUPFIXED.

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