MySQL 8.0.29
Source Code Documentation
table_global_status.h
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22
23#ifndef TABLE_GLOBAL_STATUS_H
24#define TABLE_GLOBAL_STATUS_H
25
26/**
27 @file storage/perfschema/table_global_status.h
28 Table global_status (declarations).
29*/
30
31#include <sys/types.h>
32
33#include "my_base.h"
34#include "my_inttypes.h"
39
40class Field;
41class Plugin_table;
42struct TABLE;
43struct THR_LOCK;
44/**
45 @addtogroup performance_schema_tables
46 @{
47*/
48
49/**
50 A row of table
51 PERFORMANCE_SCHEMA.GLOBAL_STATUS.
52*/
54 /** Column VARIABLE_NAME. */
56 /** Column VARIABLE_VALUE. */
58};
59
61 public:
63 : PFS_engine_index(&m_key), m_key("VARIABLE_NAME") {}
64
65 ~PFS_index_global_status() override = default;
66
67 virtual bool match(const Status_variable *pfs);
68
69 private:
71};
72
73/** Table PERFORMANCE_SCHEMA.GLOBAL_STATUS. */
76
77 public:
78 /** Table share */
81 static int delete_all_rows();
82 static ha_rows get_row_count();
83
84 void reset_position(void) override;
85
86 int rnd_init(bool scan) override;
87 int rnd_next() override;
88 int rnd_pos(const void *pos) override;
89
90 int index_init(uint idx, bool sorted) override;
91 int index_next() override;
92
93 protected:
94 int read_row_values(TABLE *table, unsigned char *buf, Field **fields,
95 bool read_all) override;
97
98 public:
99 ~table_global_status() override = default;
100
101 protected:
102 int make_row(const Status_variable *system_var);
103
104 private:
105 /** Table share lock. */
107 /** Table definition. */
109
110 /** Current THD variables. */
112 /** Current row. */
114 /** Current position. */
116 /** Next position. */
118
120};
121
122/** @} */
123#endif
Definition: field.h:573
Definition: pfs_engine_table.h:299
An abstract PERFORMANCE_SCHEMA table.
Definition: pfs_engine_table.h:69
Definition: table_global_status.h:60
virtual bool match(const Status_variable *pfs)
Definition: table_global_status.cc:46
~PFS_index_global_status() override=default
PFS_index_global_status()
Definition: table_global_status.h:62
PFS_key_variable_name m_key
Definition: table_global_status.h:70
Definition: table_helper.h:1531
Status variable cache.
Definition: pfs_variable.h:679
Class to hold information regarding a table to be created on behalf of a plugin.
Definition: plugin_table.h:39
Status variable derived from SHOW_VAR.
Definition: pfs_variable.h:209
Table PERFORMANCE_SCHEMA.GLOBAL_STATUS.
Definition: table_global_status.h:74
int rnd_next() override
Fetch the next row in this cursor.
Definition: table_global_status.cc:127
static PFS_engine_table * create(PFS_engine_table_share *)
Definition: table_global_status.cc:87
row_global_status m_row
Current row.
Definition: table_global_status.h:113
static PFS_engine_table_share m_share
Table share.
Definition: table_global_status.h:79
table_global_status()
Definition: table_global_status.cc:109
int rnd_init(bool scan) override
Initialize table scan.
Definition: table_global_status.cc:120
static THR_LOCK m_table_lock
Table share lock.
Definition: table_global_status.h:106
pos_t m_pos
Current position.
Definition: table_global_status.h:115
static Plugin_table m_table_def
Table definition.
Definition: table_global_status.h:108
int make_row(const Status_variable *system_var)
Definition: table_global_status.cc:177
pos_t m_next_pos
Next position.
Definition: table_global_status.h:117
static ha_rows get_row_count()
Definition: table_global_status.cc:102
void reset_position(void) override
Reset the cursor position to the beginning of the table.
Definition: table_global_status.cc:115
PFS_status_variable_cache m_status_cache
Current THD variables.
Definition: table_global_status.h:111
int read_row_values(TABLE *table, unsigned char *buf, Field **fields, bool read_all) override
Read the current row values.
Definition: table_global_status.cc:188
static int delete_all_rows()
Definition: table_global_status.cc:91
~table_global_status() override=default
int index_next() override
Find key in index, read record.
Definition: table_global_status.cc:161
int index_init(uint idx, bool sorted) override
Definition: table_global_status.cc:149
int rnd_pos(const void *pos) override
Fetch a row by position.
Definition: table_global_status.cc:139
PFS_simple_index pos_t
Definition: table_global_status.h:75
PFS_index_global_status * m_opened_index
Definition: table_global_status.h:119
char * pos
Definition: do_ctype.cc:76
This file includes constants used by all storage engines.
my_off_t ha_rows
Definition: my_base.h:1139
Some integer typedefs for easier portability.
Definition: buf0block_hint.cc:29
Performance schema tables (declarations).
Performance schema system and status variables (declarations).
static const LEX_CSTRING pfs
Definition: sql_show_processlist.cc:65
Performance schema instrumentation (declarations).
A PERFORMANCE_SCHEMA table share.
Definition: pfs_engine_table.h:357
Position of a cursor, for simple iterations.
Definition: pfs_engine_table.h:558
Definition: table_helper.h:1086
Definition: table_helper.h:1099
Definition: table.h:1394
Definition: thr_lock.h:138
A row of table PERFORMANCE_SCHEMA.GLOBAL_STATUS.
Definition: table_global_status.h:53
PFS_variable_value_row m_variable_value
Column VARIABLE_VALUE.
Definition: table_global_status.h:57
PFS_variable_name_row m_variable_name
Column VARIABLE_NAME.
Definition: table_global_status.h:55
Helpers to implement a performance schema table.
unsigned int uint
Definition: uca-dump.cc:29