LMDB
Modules | Macros | Enumerator | Variables
Write Flags

Modules

 Copy Flags
 

Macros

#define MDB_NOOVERWRITE   0x10
 
#define MDB_NODUPDATA   0x20
 
#define MDB_CURRENT   0x40
 
#define MDB_RESERVE   0x10000
 
#define MDB_APPEND   0x20000
 
#define MDB_APPENDDUP   0x40000
 
#define MDB_MULTIPLE   0x80000
 

Variables

size_t MDB_val::mv_size
 
void * MDB_val::mv_data
 
unsigned int MDB_stat::ms_psize
 
unsigned int MDB_stat::ms_depth
 
mdb_size_t MDB_stat::ms_branch_pages
 
mdb_size_t MDB_stat::ms_leaf_pages
 
mdb_size_t MDB_stat::ms_overflow_pages
 
mdb_size_t MDB_stat::ms_entries
 
void * MDB_envinfo::me_mapaddr
 
mdb_size_t MDB_envinfo::me_mapsize
 
mdb_size_t MDB_envinfo::me_last_pgno
 
mdb_size_t MDB_envinfo::me_last_txnid
 
unsigned int MDB_envinfo::me_maxreaders
 
unsigned int MDB_envinfo::me_numreaders
 

Detailed Description

LMDB Command Line Tools

The following describes the command line tools that are available for LMDB.

Macro Definition Documentation

 ◆ MDB_NOOVERWRITE

#define MDB_NOOVERWRITE   0x10

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

 ◆ MDB_NODUPDATA

#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.

 ◆ MDB_CURRENT

#define MDB_CURRENT   0x40

For mdb_cursor_put: overwrite the current key/data pair

 ◆ MDB_RESERVE

#define MDB_RESERVE   0x10000

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

 ◆ MDB_APPEND

#define MDB_APPEND   0x20000

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

 ◆ MDB_APPENDDUP

#define MDB_APPENDDUP   0x40000

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

 ◆ MDB_MULTIPLE

#define MDB_MULTIPLE   0x80000

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

Variable Documentation

 ◆ mv_size

size_t MDB_val::mv_size

size of the data item

 ◆ mv_data

void* MDB_val::mv_data

address of the data item

 ◆ ms_psize

unsigned int MDB_stat::ms_psize

Size of a database page. This is currently the same for all databases.

 ◆ ms_depth

unsigned int MDB_stat::ms_depth

Depth (height) of the B-tree

 ◆ ms_branch_pages

mdb_size_t MDB_stat::ms_branch_pages

Number of internal (non-leaf) pages

 ◆ ms_leaf_pages

mdb_size_t MDB_stat::ms_leaf_pages

Number of leaf pages

 ◆ ms_overflow_pages

mdb_size_t MDB_stat::ms_overflow_pages

Number of overflow pages

 ◆ ms_entries

mdb_size_t MDB_stat::ms_entries

Number of data items

 ◆ me_mapaddr

void* MDB_envinfo::me_mapaddr

Address of map, if fixed

 ◆ me_mapsize

mdb_size_t MDB_envinfo::me_mapsize

Size of the data memory map

 ◆ me_last_pgno

mdb_size_t MDB_envinfo::me_last_pgno

ID of the last used page

 ◆ me_last_txnid

mdb_size_t MDB_envinfo::me_last_txnid

ID of the last committed transaction

 ◆ me_maxreaders

unsigned int MDB_envinfo::me_maxreaders

max reader slots in the environment

 ◆ me_numreaders

unsigned int MDB_envinfo::me_numreaders

max reader slots used in the environment