diff options
Diffstat (limited to 'include/leveldb/db.h')
| -rw-r--r-- | include/leveldb/db.h | 15 |
1 files changed, 13 insertions, 2 deletions
diff --git a/include/leveldb/db.h b/include/leveldb/db.h index f945dd7..7fb2965 100644 --- a/include/leveldb/db.h +++ b/include/leveldb/db.h @@ -112,6 +112,8 @@ class DB { // where <N> is an ASCII representation of a level number (e.g. "0"). // "leveldb.stats" - returns a multi-line string that describes statistics // about the internal operation of the DB. + // "leveldb.sstables" - returns a multi-line string that describes all + // of the sstables that make up the db contents. virtual bool GetProperty(const Slice& property, std::string* value) = 0; // For each i in [0,n-1], store in "sizes[i]", the approximate @@ -125,8 +127,17 @@ class DB { virtual void GetApproximateSizes(const Range* range, int n, uint64_t* sizes) = 0; - // Possible extensions: - // (1) Add a method to compact a range of keys + // Compact the underlying storage for the key range [*begin,*end]. + // In particular, deleted and overwritten versions are discarded, + // and the data is rearranged to reduce the cost of operations + // needed to access the data. This operation should typically only + // be invoked by users who understand the underlying implementation. + // + // begin==NULL is treated as a key before all keys in the database. + // end==NULL is treated as a key after all keys in the database. + // Therefore the following call will compact the entire database: + // db->CompactRange(NULL, NULL); + virtual void CompactRange(const Slice* begin, const Slice* end) = 0; private: // No copying allowed |