libmdbx/src/bits.md

N |   MASK  | ENV       | TXN          | DB       | PUT       | DBI        | NODE    | PAGE     |
--|---------|-----------|--------------|----------|-----------|------------|---------|----------|
0 |0000 0001|ALLOC_CACHE|TXN_FINISHED  |          |           |DBI_DIRTY   |F_BIGDATA|P_BRANCH
1 |0000 0002|ALLOC_GC   |TXN_ERROR     |REVERSEKEY|F_SUBDATA  |DBI_STALE   |F_SUBDATA|P_LEAF
2 |0000 0004|ALLOC_NEW  |TXN_DIRTY     |DUPSORT   |           |DBI_FRESH   |F_DUPDATA|P_OVERFLOW
3 |0000 0008|ALLOC_SLOT |TXN_SPILLS    |INTEGERKEY|           |DBI_CREAT   |         |P_META
4 |0000 0010|           |TXN_HAS_CHILD |DUPFIXED  |NOOVERWRITE|DBI_VALID   |         |P_BAD
5 |0000 0020|           |              |INTEGERDUP|NODUPDATA  |DBI_USRVALID|         |P_LEAF2
6 |0000 0040|           |              |REVERSEDUP|CURRENT    |DBI_DUPDATA |         |P_SUBP
7 |0000 0080|           |              |          |ALLDUPS    |DBI_AUDITED |         |
8 |0000 0100|           |              |          |           |            |         |
9 |0000 0200|           |              |          |           |            |         |
10|0000 0400|           |              |          |           |            |         |
11|0000 0800|           |              |          |           |            |         |
12|0000 1000|           |              |          |           |            |         |
13|0000 2000|           |              |          |           |            |         |P_SPILLED
14|0000 4000|NOSUBDIR   |              |          |           |            |         |P_LOOSE
15|0000 8000|           |              |DB_VALID  |NOSPILL    |            |         |P_FROZEN
16|0001 0000|SAFE_NOSYNC|TXN_NOSYNC    |          |RESERVE    |            |RESERVE  |
17|0002 0000|RDONLY     |TXN_RDONLY    |          |APPEND     |            |APPEND   |
18|0004 0000|NOMETASYNC |TXN_NOMETASYNC|CREATE    |APPENDDUP
19|0008 0000|WRITEMAP   |<=            |          |MULTIPLE
20|0010 0000|UTTERLY    |              |
21|0020 0000|NOTLS      |<=            |
22|0040 0000|EXCLUSIVE  |              |
23|0080 0000|NORDAHEAD  |              |
24|0100 0000|NOMEMINIT  |TXN_PREPARE   |
25|0200 0000|COALESCE   |              |
26|0400 0000|LIFORECLAIM|              |
27|0800 0000|PAGEPERTURB|              |
28|1000 0000|ENV_TXKEY  |TXN_TRY       |
29|2000 0000|ENV_ACTIVE |              |
30|4000 0000|ACCEDE     |SHRINK_ALLOWED|DB_ACCEDE
31|8000 0000|FATAL_ERROR|              |
mdbx: add internal bits/flags table. Change-Id: Ia9d0e9f678b51d8ffd1830998e9cd5d04c749974 2020-10-08 23:16:06 +03:00			`N \| MASK \| ENV \| TXN \| DB \| PUT \| DBI \| NODE \| PAGE \|`
			`--\|---------\|-----------\|--------------\|----------\|-----------\|------------\|---------\|----------\|`
mdbx: avoid `MDBX_TXN_FULL` while searching for a large multi-page region. Resolves https://github.com/erthink/libmdbx/issues/123 but with TODO: - provide a user-configurable threshold instead of currently hard-coded default (MDBX_PNL_MAX/2). Change-Id: Ia7bfd5f8d36e027444d234e3c3aabe4832313466 2020-10-22 17:49:13 +03:00			`0 \|0000 0001\|ALLOC_CACHE\|TXN_FINISHED \| \| \|DBI_DIRTY \|F_BIGDATA\|P_BRANCH`
mdbx: minor refine internals comments/docs. Change-Id: Ie1dd2233259948b4906e66fb191832dbc6526c47 2020-10-28 03:16:57 +03:00			`1 \|0000 0002\|ALLOC_GC \|TXN_ERROR \|REVERSEKEY\|F_SUBDATA \|DBI_STALE \|F_SUBDATA\|P_LEAF`
mdbx: avoid `MDBX_TXN_FULL` while searching for a large multi-page region. Resolves https://github.com/erthink/libmdbx/issues/123 but with TODO: - provide a user-configurable threshold instead of currently hard-coded default (MDBX_PNL_MAX/2). Change-Id: Ia7bfd5f8d36e027444d234e3c3aabe4832313466 2020-10-22 17:49:13 +03:00			`2 \|0000 0004\|ALLOC_NEW \|TXN_DIRTY \|DUPSORT \| \|DBI_FRESH \|F_DUPDATA\|P_OVERFLOW`
mdbx: refactoring `page_alloc()` result type. Change-Id: I4afc73603d610e4e28b952a38dfa9f30d56809bf 2021-04-18 01:55:29 +03:00			`3 \|0000 0008\|ALLOC_SLOT \|TXN_SPILLS \|INTEGERKEY\| \|DBI_CREAT \| \|P_META`
mdbx: drop `P_KEEP` flag and use LRU-label insted of. Related to https://github.com/erthink/libmdbx/issues/186 Change-Id: Ifd3bd2533b40525dd5b0aa05df421c87462c2439 2021-04-27 19:23:20 +03:00			`4 \|0000 0010\| \|TXN_HAS_CHILD \|DUPFIXED \|NOOVERWRITE\|DBI_VALID \| \|P_BAD`
mdbx: add internal bits/flags table. Change-Id: Ia9d0e9f678b51d8ffd1830998e9cd5d04c749974 2020-10-08 23:16:06 +03:00			`5 \|0000 0020\| \| \|INTEGERDUP\|NODUPDATA \|DBI_USRVALID\| \|P_LEAF2`
			`6 \|0000 0040\| \| \|REVERSEDUP\|CURRENT \|DBI_DUPDATA \| \|P_SUBP`
mdbx: drop `P_KEEP` flag and use LRU-label insted of. Related to https://github.com/erthink/libmdbx/issues/186 Change-Id: Ifd3bd2533b40525dd5b0aa05df421c87462c2439 2021-04-27 19:23:20 +03:00			`7 \|0000 0080\| \| \| \|ALLDUPS \|DBI_AUDITED \| \|`
mdbx: add internal bits/flags table. Change-Id: Ia9d0e9f678b51d8ffd1830998e9cd5d04c749974 2020-10-08 23:16:06 +03:00			`8 \|0000 0100\| \| \| \| \| \| \|`
			`9 \|0000 0200\| \| \| \| \| \| \|`
			`10\|0000 0400\| \| \| \| \| \| \|`
			`11\|0000 0800\| \| \| \| \| \| \|`
			`12\|0000 1000\| \| \| \| \| \| \|`
mdbx: drop `P_KEEP` flag and use LRU-label insted of. Related to https://github.com/erthink/libmdbx/issues/186 Change-Id: Ifd3bd2533b40525dd5b0aa05df421c87462c2439 2021-04-27 19:23:20 +03:00			`13\|0000 2000\| \| \| \| \| \| \|P_SPILLED`
mdbx: add internal bits/flags table. Change-Id: Ia9d0e9f678b51d8ffd1830998e9cd5d04c749974 2020-10-08 23:16:06 +03:00			`14\|0000 4000\|NOSUBDIR \| \| \| \| \| \|P_LOOSE`
mdbx: drop `P_KEEP` flag and use LRU-label insted of. Related to https://github.com/erthink/libmdbx/issues/186 Change-Id: Ifd3bd2533b40525dd5b0aa05df421c87462c2439 2021-04-27 19:23:20 +03:00			`15\|0000 8000\| \| \|DB_VALID \|NOSPILL \| \| \|P_FROZEN`
			`16\|0001 0000\|SAFE_NOSYNC\|TXN_NOSYNC \| \|RESERVE \| \|RESERVE \|`
mdbx: add internal bits/flags table. Change-Id: Ia9d0e9f678b51d8ffd1830998e9cd5d04c749974 2020-10-08 23:16:06 +03:00			`17\|0002 0000\|RDONLY \|TXN_RDONLY \| \|APPEND \| \|APPEND \|`
			`18\|0004 0000\|NOMETASYNC \|TXN_NOMETASYNC\|CREATE \|APPENDDUP`
			`19\|0008 0000\|WRITEMAP \|<= \| \|MULTIPLE`
			`20\|0010 0000\|UTTERLY \| \|`
			`21\|0020 0000\|NOTLS \|<= \|`
			`22\|0040 0000\|EXCLUSIVE \| \|`
			`23\|0080 0000\|NORDAHEAD \| \|`
			`24\|0100 0000\|NOMEMINIT \|TXN_PREPARE \|`
			`25\|0200 0000\|COALESCE \| \|`
			`26\|0400 0000\|LIFORECLAIM\| \|`
			`27\|0800 0000\|PAGEPERTURB\| \|`
			`28\|1000 0000\|ENV_TXKEY \|TXN_TRY \|`
			`29\|2000 0000\|ENV_ACTIVE \| \|`
			`30\|4000 0000\|ACCEDE \|SHRINK_ALLOWED\|DB_ACCEDE`
			`31\|8000 0000\|FATAL_ERROR\| \|`