MySQL 8.4.0
Source Code Documentation
table_global_status.h
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23
24#ifndef TABLE_GLOBAL_STATUS_H
25#define TABLE_GLOBAL_STATUS_H
26
27/**
28 @file storage/perfschema/table_global_status.h
29 Table global_status (declarations).
30*/
31
32#include <sys/types.h>
33
34#include "my_base.h"
35#include "my_inttypes.h"
40
41class Field;
42class Plugin_table;
43struct TABLE;
44struct THR_LOCK;
45/**
46 @addtogroup performance_schema_tables
47 @{
48*/
49
50/**
51 A row of table
52 PERFORMANCE_SCHEMA.GLOBAL_STATUS.
53*/
55 /** Column VARIABLE_NAME. */
57 /** Column VARIABLE_VALUE. */
59};
60
62 public:
64 : PFS_engine_index(&m_key), m_key("VARIABLE_NAME") {}
65
66 ~PFS_index_global_status() override = default;
67
68 virtual bool match(const Status_variable *pfs);
69
70 private:
72};
73
74/** Table PERFORMANCE_SCHEMA.GLOBAL_STATUS. */
77
78 public:
79 /** Table share */
82 static int delete_all_rows();
83 static ha_rows get_row_count();
84
85 void reset_position() override;
86
87 int rnd_init(bool scan) override;
88 int rnd_next() override;
89 int rnd_pos(const void *pos) override;
90
91 int index_init(uint idx, bool sorted) override;
92 int index_next() override;
93
94 protected:
95 int read_row_values(TABLE *table, unsigned char *buf, Field **fields,
96 bool read_all) override;
98
99 public:
100 ~table_global_status() override = default;
101
102 protected:
103 int make_row(const Status_variable *status_var);
104
105 private:
106 /** Table share lock. */
108 /** Table definition. */
110
111 /** Current THD variables. */
113 /** Current row. */
115 /** Current position. */
117 /** Next position. */
119
121};
122
123/** @} */
124#endif
Definition: field.h:575
Definition: pfs_engine_table.h:300
An abstract PERFORMANCE_SCHEMA table.
Definition: pfs_engine_table.h:70
Definition: table_global_status.h:61
virtual bool match(const Status_variable *pfs)
Definition: table_global_status.cc:47
~PFS_index_global_status() override=default
PFS_index_global_status()
Definition: table_global_status.h:63
PFS_key_variable_name m_key
Definition: table_global_status.h:71
Definition: table_helper.h:1577
Status variable cache.
Definition: pfs_variable.h:678
Class to hold information regarding a table to be created on behalf of a plugin.
Definition: plugin_table.h:40
Status variable derived from SHOW_VAR.
Definition: pfs_variable.h:208
Table PERFORMANCE_SCHEMA.GLOBAL_STATUS.
Definition: table_global_status.h:75
int rnd_next() override
Fetch the next row in this cursor.
Definition: table_global_status.cc:128
static PFS_engine_table * create(PFS_engine_table_share *)
Definition: table_global_status.cc:88
row_global_status m_row
Current row.
Definition: table_global_status.h:114
static PFS_engine_table_share m_share
Table share.
Definition: table_global_status.h:80
table_global_status()
Definition: table_global_status.cc:110
int rnd_init(bool scan) override
Initialize table scan.
Definition: table_global_status.cc:121
static THR_LOCK m_table_lock
Table share lock.
Definition: table_global_status.h:107
pos_t m_pos
Current position.
Definition: table_global_status.h:116
void reset_position() override
Reset the cursor position to the beginning of the table.
Definition: table_global_status.cc:116
static Plugin_table m_table_def
Table definition.
Definition: table_global_status.h:109
pos_t m_next_pos
Next position.
Definition: table_global_status.h:118
static ha_rows get_row_count()
Definition: table_global_status.cc:103
PFS_status_variable_cache m_status_cache
Current THD variables.
Definition: table_global_status.h:112
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:189
static int delete_all_rows()
Definition: table_global_status.cc:92
int make_row(const Status_variable *status_var)
Definition: table_global_status.cc:178
~table_global_status() override=default
int index_next() override
Find key in index, read record.
Definition: table_global_status.cc:162
int index_init(uint idx, bool sorted) override
Definition: table_global_status.cc:150
int rnd_pos(const void *pos) override
Fetch a row by position.
Definition: table_global_status.cc:140
PFS_simple_index pos_t
Definition: table_global_status.h:76
PFS_index_global_status * m_opened_index
Definition: table_global_status.h:120
This file includes constants used by all storage engines.
my_off_t ha_rows
Definition: my_base.h:1141
Some integer typedefs for easier portability.
static PFS_engine_table_share_proxy table
Definition: pfs.cc:61
Definition: buf0block_hint.cc:30
Performance schema tables (declarations).
Performance schema system and status variables (declarations).
static const LEX_CSTRING pfs
Definition: sql_show_processlist.cc:66
Performance schema instrumentation (declarations).
A PERFORMANCE_SCHEMA table share.
Definition: pfs_engine_table.h:358
Position of a cursor, for simple iterations.
Definition: pfs_engine_table.h:558
Definition: table_helper.h:1115
Definition: table_helper.h:1128
Definition: table.h:1405
Definition: thr_lock.h:139
A row of table PERFORMANCE_SCHEMA.GLOBAL_STATUS.
Definition: table_global_status.h:54
PFS_variable_value_row m_variable_value
Column VARIABLE_VALUE.
Definition: table_global_status.h:58
PFS_variable_name_row m_variable_name
Column VARIABLE_NAME.
Definition: table_global_status.h:56
Helpers to implement a performance schema table.