如果再去查找肯定又是离散读取的情况了,这样InsertBuffer就失去了意义。 Insert Buffer信息查看 我们可以使用命令SHOW ENGINE INNODB STATUS来查看Insert Buffer的信息: ---INSERTBUFFERANDADAPTIVE HASHINDEX---Ibuf: size7545, free listlen3790, seg size11336,8075308inserts,7540969merged sec,2246304merges ... 使...
当读取辅助索引页到缓冲池,将insert buffer中的记录合并到辅助索引页 相关的2个选项:--innodb_change_buffer_max_size 默认为 25%--innodb_change_buffering 默认为all (insert\delete\purge\change\all\none) show engine innodb status里查看下INSERT BUFFER AND ADAPTIVE HASH INDEX---Ibuf: size 1, free lis...
InnoDB从1.0.x版本开始引入了Change Buffer,可将其视为Insert Buffer的升级。从这个版本开始,InnoDB存储引擎可以对DML操作——INSERT、DELETE、UPDATE都进行缓冲,他们分别是:Insert Buffer、Delete Buffer、Purge buffer。 当然和之前Insert Buffer一样,Change Buffer适用的对象依然是非唯一的辅助索引。 对一条记录进行UPDAT...
在源码中的命名一直还是用ibuf,因此之后都用ibuf来指代InsertBuffer Insert Buffer的信息可以在show innodb status中看到,例如: INSERT BUFFER AND ADAPTIVE HASH INDEX Ibuf: size 7545, free list len 3790, seg size 11336 (单位是page) 8075308 inserts, 7540969 merged recs, 2246304 merges }; 从上述的结构体...
七、查看你的MySQL的change buffer# # 命令SHOW ENGINE INNODB STATUS\G# 查看如下部分---INSERT BUFFER AND ADAPTIVE HASH INDEX---Ibuf: size 1, free list len 0, seg size 2, 0 mergesmerged operations:insert 0, delete mark 0, delete 0discarded operations:insert 0, delete mark 0, delete 0Has...
INSERT BUFFER AND ADAPTIVE HASH INDEX --- Ibuf: size 1, free list len 0, seg size 2, 2920 merges merged operations: insert 23858, delete mark 0, delete 0 discarded operations: insert 0, delete mark 0, delete 0 seg size显示了当前插入缓冲的大小为2 *16KB,大约为32KB...
INSERT BUFFER AND ADAPTIVE HASH INDEX --- Ibuf: size 1, free list len 57, seg size 59, 136 merges merged operations: insert 1660, delete mark 0, delete 0 discarded operations: insert 0, delete mark 0, delete 0 Hash table size 1423691, node heap has 3 buffer(s) 0.00 ha...
(dtuple_t) entry_list;/* list of entries, one for each index */ byte* row_id_buf;/* buffer for the row id sys field in row */ trx_id_t trx_id; /*!< trx id or the last trx which executed the node */ byte* trx_id_buf;/* buffer for the trx id sys field in row */...
三 如何查看insert buffer 我们可以通过show engine innodb status \G 来查看插入缓冲的信息 --- INSERT BUFFER AND ADAPTIVE HASH INDEX --- Ibuf: size 1, free list len 0, seg size 2, 2920 merges merged operations: insert 23858, delete mark...
INSERT BUFFER AND ADAPTIVE HASH INDEX --- Ibuf: size 1, free list len 0, seg size 2, 1 merges merged operations: insert 1, delete mark 0, delete 0 discarded operations: insert 0, delete mark 0, delete 0 Hash table size 553193, node heap has 1 buffer(s) 0.16 hash sear...