buffer header 缓冲区的头部
Each memory block, when allocated, consists of a BufferBlockHeader header followed by a buffer block for storage of actual data.
每个内存块在分配时都包含一个bufferblockheader头，后面跟着一个用于存储实际数据的缓冲区块。
The shared-memory header contains a description of all other structures in Shared memory, including internal tables and the buffer pool.
共享内存头包含共享内存中所有其他结构的描述，包括内部表和缓冲池。
If the structure is receiving information about a column, this member specifies the address of the buffer that receives the column header text.
如果收到有关的结构是一列信息，该成员指定的缓冲区，它接收的列标题文本的地址。
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