aggregated_stats_buffer Struct Reference

Similar to System_status_var, implements atomic counters for status variables whose values are calculated by aggregating over all available sessions (THDs). More...

#include <aggregated_stats_buffer.h>

Public Member Functions
	aggregated_stats_buffer ()
void	flush ()
void	add_from (aggregated_stats_buffer &shard)
uint64_t	get_counter (std::size_t offset)

Public Attributes
std::atomic_uint64_t	com_other
std::atomic_uint64_t	com_stmt_execute
std::atomic_uint64_t	com_stmt_close
std::atomic_uint64_t	com_stmt_fetch
std::atomic_uint64_t	com_stmt_prepare
std::atomic_uint64_t	com_stmt_reset
std::atomic_uint64_t	com_stmt_reprepare
std::atomic_uint64_t	com_stmt_send_long_data
std::atomic_uint64_t	com_stat [(unsigned int) SQLCOM_END]
std::atomic_uint64_t	table_open_cache_hits
std::atomic_uint64_t	table_open_cache_misses
std::atomic_uint64_t	table_open_cache_overflows
std::atomic_uint64_t	created_tmp_disk_tables
std::atomic_uint64_t	created_tmp_tables
std::atomic_uint64_t	max_execution_time_exceeded
std::atomic_uint64_t	max_execution_time_set
std::atomic_uint64_t	max_execution_time_set_failed
std::atomic_uint64_t	opened_tables
std::atomic_uint64_t	opened_shares
std::atomic_uint64_t	questions
std::atomic_uint64_t	secondary_engine_execution_count
std::atomic_uint64_t	select_full_join_count
std::atomic_uint64_t	select_full_range_join_count
std::atomic_uint64_t	select_range_count
std::atomic_uint64_t	select_range_check_count
std::atomic_uint64_t	select_scan_count
std::atomic_uint64_t	long_query_count
std::atomic_uint64_t	filesort_merge_passes
std::atomic_uint64_t	filesort_range_count
std::atomic_uint64_t	filesort_rows
std::atomic_uint64_t	filesort_scan_count
std::atomic_uint64_t	bytes_sent
std::atomic_uint64_t	bytes_received
std::atomic_uint64_t	ha_commit_count
std::atomic_uint64_t	ha_delete_count
std::atomic_uint64_t	ha_discover_count
std::atomic_uint64_t	ha_external_lock_count
std::atomic_uint64_t	ha_multi_range_read_init_count
std::atomic_uint64_t	ha_prepare_count
std::atomic_uint64_t	ha_read_first_count
std::atomic_uint64_t	ha_read_key_count
std::atomic_uint64_t	ha_read_last_count
std::atomic_uint64_t	ha_read_next_count
std::atomic_uint64_t	ha_read_prev_count
std::atomic_uint64_t	ha_read_rnd_count
std::atomic_uint64_t	ha_read_rnd_next_count
std::atomic_uint64_t	ha_rollback_count
std::atomic_uint64_t	ha_savepoint_count
std::atomic_uint64_t	ha_savepoint_rollback_count
std::atomic_uint64_t	ha_update_count
std::atomic_uint64_t	ha_write_count

Detailed Description

Similar to System_status_var, implements atomic counters for status variables whose values are calculated by aggregating over all available sessions (THDs).

The single buffer object will store aggregated values for a number of THDs belonging to the same shard. All counters must use the same atomic data type, to simplify working with offsets.

This mechanism is used to maintain these values in real-time for the purpose of reporting telemetry metrics. Existing older mechanism to calculate the same data on-demand (for SHOW GLOBAL STATUS) was not modified.

Constructor & Destructor Documentation

aggregated_stats_buffer()

aggregated_stats_buffer::aggregated_stats_buffer

(

)

Member Function Documentation

add_from()

void aggregated_stats_buffer::add_from

(

aggregated_stats_buffer &

shard

)

flush()

void aggregated_stats_buffer::flush

(

)

get_counter()

uint64_t aggregated_stats_buffer::get_counter

(

std::size_t

offset

)

Member Data Documentation

bytes_received

std::atomic_uint64_t aggregated_stats_buffer::bytes_received

bytes_sent

std::atomic_uint64_t aggregated_stats_buffer::bytes_sent

com_other

std::atomic_uint64_t aggregated_stats_buffer::com_other

com_stat

std::atomic_uint64_t aggregated_stats_buffer::com_stat[(unsigned int) SQLCOM_END]

com_stmt_close

std::atomic_uint64_t aggregated_stats_buffer::com_stmt_close

com_stmt_execute

std::atomic_uint64_t aggregated_stats_buffer::com_stmt_execute

com_stmt_fetch

std::atomic_uint64_t aggregated_stats_buffer::com_stmt_fetch

com_stmt_prepare

std::atomic_uint64_t aggregated_stats_buffer::com_stmt_prepare

com_stmt_reprepare

std::atomic_uint64_t aggregated_stats_buffer::com_stmt_reprepare

com_stmt_reset

std::atomic_uint64_t aggregated_stats_buffer::com_stmt_reset

com_stmt_send_long_data

std::atomic_uint64_t aggregated_stats_buffer::com_stmt_send_long_data

created_tmp_disk_tables

std::atomic_uint64_t aggregated_stats_buffer::created_tmp_disk_tables

created_tmp_tables

std::atomic_uint64_t aggregated_stats_buffer::created_tmp_tables

filesort_merge_passes

std::atomic_uint64_t aggregated_stats_buffer::filesort_merge_passes

filesort_range_count

std::atomic_uint64_t aggregated_stats_buffer::filesort_range_count

filesort_rows

std::atomic_uint64_t aggregated_stats_buffer::filesort_rows

filesort_scan_count

std::atomic_uint64_t aggregated_stats_buffer::filesort_scan_count

ha_commit_count

std::atomic_uint64_t aggregated_stats_buffer::ha_commit_count

ha_delete_count

std::atomic_uint64_t aggregated_stats_buffer::ha_delete_count

ha_discover_count

std::atomic_uint64_t aggregated_stats_buffer::ha_discover_count

ha_external_lock_count

std::atomic_uint64_t aggregated_stats_buffer::ha_external_lock_count

ha_multi_range_read_init_count

std::atomic_uint64_t aggregated_stats_buffer::ha_multi_range_read_init_count

ha_prepare_count

std::atomic_uint64_t aggregated_stats_buffer::ha_prepare_count

ha_read_first_count

std::atomic_uint64_t aggregated_stats_buffer::ha_read_first_count

ha_read_key_count

std::atomic_uint64_t aggregated_stats_buffer::ha_read_key_count

ha_read_last_count

std::atomic_uint64_t aggregated_stats_buffer::ha_read_last_count

ha_read_next_count

std::atomic_uint64_t aggregated_stats_buffer::ha_read_next_count

ha_read_prev_count

std::atomic_uint64_t aggregated_stats_buffer::ha_read_prev_count

ha_read_rnd_count

std::atomic_uint64_t aggregated_stats_buffer::ha_read_rnd_count

ha_read_rnd_next_count

std::atomic_uint64_t aggregated_stats_buffer::ha_read_rnd_next_count

ha_rollback_count

std::atomic_uint64_t aggregated_stats_buffer::ha_rollback_count

ha_savepoint_count

std::atomic_uint64_t aggregated_stats_buffer::ha_savepoint_count

ha_savepoint_rollback_count

std::atomic_uint64_t aggregated_stats_buffer::ha_savepoint_rollback_count

ha_update_count

std::atomic_uint64_t aggregated_stats_buffer::ha_update_count

ha_write_count

std::atomic_uint64_t aggregated_stats_buffer::ha_write_count

long_query_count

std::atomic_uint64_t aggregated_stats_buffer::long_query_count

max_execution_time_exceeded

std::atomic_uint64_t aggregated_stats_buffer::max_execution_time_exceeded

max_execution_time_set

std::atomic_uint64_t aggregated_stats_buffer::max_execution_time_set

max_execution_time_set_failed

std::atomic_uint64_t aggregated_stats_buffer::max_execution_time_set_failed

opened_shares

std::atomic_uint64_t aggregated_stats_buffer::opened_shares

opened_tables

std::atomic_uint64_t aggregated_stats_buffer::opened_tables

questions

std::atomic_uint64_t aggregated_stats_buffer::questions

secondary_engine_execution_count

std::atomic_uint64_t aggregated_stats_buffer::secondary_engine_execution_count

select_full_join_count

std::atomic_uint64_t aggregated_stats_buffer::select_full_join_count

select_full_range_join_count

std::atomic_uint64_t aggregated_stats_buffer::select_full_range_join_count

select_range_check_count

std::atomic_uint64_t aggregated_stats_buffer::select_range_check_count

select_range_count

std::atomic_uint64_t aggregated_stats_buffer::select_range_count

select_scan_count

std::atomic_uint64_t aggregated_stats_buffer::select_scan_count

table_open_cache_hits

std::atomic_uint64_t aggregated_stats_buffer::table_open_cache_hits

table_open_cache_misses

std::atomic_uint64_t aggregated_stats_buffer::table_open_cache_misses

table_open_cache_overflows

std::atomic_uint64_t aggregated_stats_buffer::table_open_cache_overflows

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

• sql/aggregated_stats_buffer.h
• sql/aggregated_stats_buffer.cc