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mdbx: avoid MDBX_TXN_FULL while searching for a large multi-page region.

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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
This commit is contained in:
Leonid Yuriev
2020-10-22 17:49:13 +03:00
parent 8a7caec54a
commit 55d190bad9
2 changed files with 23 additions and 9 deletions
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6
src/bits.md
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@@ -1,8 +1,8 @@
N | MASK | ENV | TXN | DB | PUT | DBI | NODE | PAGE |
--|---------|-----------|--------------|----------|-----------|------------|---------|----------|
0 |0000 0001| |TXN_FINISHED | | |DBI_DIRTY |F_BIGDATA|P_BRANCH
1 |0000 0002| |TXN_ERROR |REVERSEKEY| |DBI_STALE |F_SUBDATA|P_LEAF
2 |0000 0004| |TXN_DIRTY |DUPSORT | |DBI_FRESH |F_DUPDATA|P_OVERFLOW
0 |0000 0001|ALLOC_CACHE|TXN_FINISHED | | |DBI_DIRTY |F_BIGDATA|P_BRANCH
1 |0000 0002|ALLOC_GC |TXN_ERROR |REVERSEKEY| |DBI_STALE |F_SUBDATA|P_LEAF
2 |0000 0004|ALLOC_NEW |TXN_DIRTY |DUPSORT | |DBI_FRESH |F_DUPDATA|P_OVERFLOW
3 |0000 0008| |TXN_SPILLS |INTEGERKEY| |DBI_CREAT | |P_META
4 |0000 0010| |TXN_HAS_CHILD |DUPFIXED |NOOVERWRITE|DBI_VALID | |P_DIRTY
5 |0000 0020| | |INTEGERDUP|NODUPDATA |DBI_USRVALID| |P_LEAF2