/** Structure for an SQL data field */structdfield_t{void*data;// 真实列数据的指针unsignedext:1;// 如果是大记录(blob),则在外部页存储unsignedlen:32;// 列数据的长度dtype_ttype;// 列数据的类型}; 基于B-tree 的索引 InnoDB的索引全貌(B+Tree index structures in InnoDB): 其中: 树高度的...
The need for B-tree arose with the rise in the need for lesser time inaccessing the physical storage medialike a hard disk. The secondary storage devices are slower with a larger capacity. There was a need for such types of data structures that minimize the disk accesses. Other data struct...
[Data_structure] B tree & B+tree B tree 개요 정의 B트리는 데이터를 정렬하여 탐색, 삽입, 삭제 및 순차 접근이 가능하도록 유지하는 트리형 자료구조이다. B tree의 장점 B트리는 Balanced-Tree의 ...
3. InnoDB的索引结构也采用的是B+Tree,InnoDB的索引文件本身就是数据文件,叶子节点的data不在存储数据文件的地址,而是改为直接存储数据,而这样的索引结构也称为聚簇索引,正好与MyISAM相对。除此之外,InnoDB的辅助索引data域存储的是相应记录主键的值而不是地址,所有辅助索引都引用主键作为data域。 所以,聚簇索引这种...
typedef struct{ NodeType *pt; /*指向找到的结点*/ int i; /*在结点中的关键码序号,结点序号区间[1…m]*/ int tag; /* 1:查找成功,0:查找失败*/ } Result; /*B 树的查找结果类型*/ Result SearchBTree(NodeType *t,KeyType kx) {
/* Btree Page Operation queue Data Struct */typedef struct BTPageOpaqueData { BlockNumber btpo_prev;/* 前一页块号,用于索引反向扫描 */BlockNumber btpo_next;/* 后一页快页快号,用于索引正向扫描 */union{ uint32 level;/* 页面在索引树中层次,0表示叶子层 */TransactionId xact;/* 删除页面的是...
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[m+1];/*记录指针向量*/}NodeType;/*B 树结点类型*/typedef struct{NodeType*pt;/*指向找到的结点*/int i;/*在结点中的关键码序号,结点序号区间[1…m]*/int tag;/* 1:查找成功,0:查找失败*/}Result;/*B 树的查找结果类型*/ResultSearchBTree(NodeType*t,KeyType kx){/*在m 阶B 树t 上查找...
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Unlike the other trees, the height of a B Tree increases upwards toward the root node, and the insertion happens at the leaf node. The Time Complexity of all the operations of a B Tree is O(log?n), where 'n' is the number of data elements present in the B Tree. ...