在MySQL5.6 之前,并不区分Index Filter与Table Filter,统统将Index First Key与Index Last Key范围内的索引记录,回表读取完整记录,然后返回给MySQL Server层进行过滤。 而在MySQL 5.6之后,Index Filter与Table Filter分离,Index Filter下降到InnoDB的索引层面进行过滤,
extra:using index condition; using temporary; using filesort type 代表连接类型。range是索引范围扫描的时候显示的类型。 possible_keys 和 keys 是可用的索引以及实际的索引 extra 比较关键,我们详细看一下这里的信息: filesort 是说在排序的时候,没办法使用索引。比如我们这里用的索引是time,但group by 是 time...
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extra:using index condition; using temporary; using filesort 1. 2. 3. 4. type 代表连接类型。range是索引范围扫描的时候显示的类型。 possible_keys 和 keys 是可用的索引以及实际的索引 extra 比较关键,我们详细看一下这里的信息: filesort 是说在排序的时候,没办法使用索引。比如我们这里用的索引是time,...
idx3 89 NULL 1 Using index condition; Using where; Using temporary; Using filesort it is using idx3 which is defined as KEY `idx3` (`col2`(86)) push_index_cond() and co correctly detect that "col2 <= '6566-06-15" part of the condition cannot be checked by using the index. ...
(`tr2`.`id` between 'b' and 'c')"}]/* steps */}/* condition_processing */},{"table":"`tr2`","range_analysis":{"table_scan":{"rows":4,"cost":3.9}/* table_scan */,"potential_range_indices":[{"index":"PRIMARY","usable":true,"key_parts":["id"]/* key_parts */}]/...
(The example shows how to handle the “table already exists” condition for illustration purposes. In a real application, we would typically avoid the error condition entirely by using the IF NOT EXISTS clause of the CREATE TABLE statement.) ...
Index _WIN32_WINNT not defined. Defaulting to _WIN32_WINNT_MAXVER (see WinSDKVer.h) : A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed !> in c# . Check is object null - What are the options? .Net ...
c# if condition string length count C# IIF check int and return string if NullorEmpty C# JSON DeserializeObject Return NULL for embedded JSON and List of JSON objects C# List Iteration Performance C# Mod function C# Partial Classes advantages and disadvantages C# Partial classes with different file...
Other advanced options on theCreate Masking Definitionscreen allow you to disable database logging (redo log generation) during masking, refresh table and index statistics after the masking process, drop the temporary tables created during masking, and use parallel execution, when possible, to speed ...