Public Attributes | |
| union { | |
| pgno_t p_pgno | |
| struct MDB_page * p_next | |
| } | mp_p |
| uint16_t | mp_pad |
| uint16_t | mp_flags |
| union { | |
| struct { | |
| indx_t pb_lower | |
| indx_t pb_upper | |
| } pb | |
| uint32_t pb_pages | |
| } | mp_pb |
| indx_t | mp_ptrs [1] |
Detailed Description
Common header for all page types. The page type depends on mp_flags.
P_BRANCH and P_LEAF pages have unsorted 'MDB_node's at the end, with sorted mp_ptrs[] entries referring to them. Exception: P_LEAF2 pages omit mp_ptrs and pack sorted MDB_DUPFIXED values after the page header.
P_OVERFLOW records occupy one or more contiguous pages where only the first has a page header. They hold the real data of F_BIGDATA nodes.
P_SUBP sub-pages are small leaf "pages" with duplicate data. A node with flag F_DUPDATA but not F_SUBDATA contains a sub-page. (Duplicate data can also go in sub-databases, which use normal pages.)
P_META pages contain MDB_meta, the start point of an LMDB snapshot.
Each non-metapage up to MDB_meta.mm_last_pg is reachable exactly once in the snapshot: Either used by a database or listed in a freeDB record.
Member Data Documentation
◆ mp_flags
| uint16_t MDB_page::mp_flags |
◆ [union]
| union { ... } MDB_page::mp_p |
◆ mp_pad
| uint16_t MDB_page::mp_pad |
key size if this is a LEAF2 page
◆ [union]
| union { ... } MDB_page::mp_pb |
◆ mp_ptrs
| indx_t MDB_page::mp_ptrs[1] |
dynamic size
◆ p_next
| struct MDB_page* MDB_page::p_next |
for in-memory list of freed pages
◆ p_pgno
| pgno_t MDB_page::p_pgno |
page number
◆ [struct]
| struct { ... } MDB_page::pb |
◆ pb_lower
| indx_t MDB_page::pb_lower |
lower bound of free space
◆ pb_pages
| uint32_t MDB_page::pb_pages |
number of overflow pages
◆ pb_upper
| indx_t MDB_page::pb_upper |
upper bound of free space
The documentation for this struct was generated from the following file:
- external/db_drivers/liblmdb/mdb.c
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