Callback for collecting mutex statistics. More...

Classes
struct	GetCount
	Collect the individual latch counts. More...

struct	OrderByWaits
	Order by m_waits, in descending order. More...

struct	Value
	For tracking the mutex metrics. More...

Public Types
typedef std::vector< Value, ut::allocator< Value > >	Values

Public Member Functions
	ShowStatus ()=default
	Constructor. More...

bool	operator() (latch_meta_t &latch_meta) 1
	Callback for collecting the stats. More...

bool	to_string (THD thd, stat_print_fn stat_print) 1
	Implements the SHOW MUTEX STATUS command, for mutexes. More...

Public Attributes
Values	m_values
	For collecting the active mutex stats. More...

Detailed Description

Callback for collecting mutex statistics.

Member Typedef Documentation

◆ Values

typedef std::vector<Value, ut::allocator<Value> > ShowStatus::Values

Constructor & Destructor Documentation

◆ ShowStatus()

ShowStatus::ShowStatus ( )

default

Constructor.

Member Function Documentation

◆ operator()()

bool ShowStatus::operator() ( latch_meta_t & latch_meta )

inline

Callback for collecting the stats.

Parameters

[in] latch_meta Latch meta data

Returns: always returns true

◆ to_string()

bool ShowStatus::to_string	(	THD *	thd,
		stat_print_fn *	stat_print
	)

Implements the SHOW MUTEX STATUS command, for mutexes.

The table structure is like so: Engine | Mutex Name | Status We store the metrics in the "Status" column as:

    spins=N,waits=N,calls=N"

The user has to parse the data unfortunately

Parameters

[in,out]	thd	the MySQL query thread of the caller
[in,out]	stat_print	function for printing statistics

Returns: true on success.

Member Data Documentation

◆ m_values

Values ShowStatus::m_values

For collecting the active mutex stats.

The documentation for this struct was generated from the following file:

storage/innobase/handler/ha_innodb.cc

Classes

Public Types

Public Member Functions

Public Attributes