27.4.1 sys Schema Object Index

The following tables list sys schema objects and provide a short description of each one.

Table 27.1 sys Schema Tables and Triggers

Table or Trigger Name	Description
`sys_config`	`sys` schema configuration options
`sys_config_insert_set_user`	`sys_config` insert trigger
`sys_config_update_set_user`	`sys_config` update trigger

Table 27.2 sys Schema Views

View Name	Description
`host_summary`, `x$host_summary`	Statement activity, file I/O, and connections, grouped by host
`host_summary_by_file_io`, `x$host_summary_by_file_io`	File I/O, grouped by host
`host_summary_by_file_io_type`, `x$host_summary_by_file_io_type`	File I/O, grouped by host and event type
`host_summary_by_stages`, `x$host_summary_by_stages`	Statement stages, grouped by host
`host_summary_by_statement_latency`, `x$host_summary_by_statement_latency`	Statement statistics, grouped by host
`host_summary_by_statement_type`, `x$host_summary_by_statement_type`	Statements executed, grouped by host and statement
`innodb_buffer_stats_by_schema`, `x$innodb_buffer_stats_by_schema`	`InnoDB` buffer information, grouped by schema
`innodb_buffer_stats_by_table`, `x$innodb_buffer_stats_by_table`	`InnoDB` buffer information, grouped by schema and table
`innodb_lock_waits`, `x$innodb_lock_waits`	`InnoDB` lock information
`io_by_thread_by_latency`, `x$io_by_thread_by_latency`	I/O consumers, grouped by thread
`io_global_by_file_by_bytes`, `x$io_global_by_file_by_bytes`	Global I/O consumers, grouped by file and bytes
`io_global_by_file_by_latency`, `x$io_global_by_file_by_latency`	Global I/O consumers, grouped by file and latency
`io_global_by_wait_by_bytes`, `x$io_global_by_wait_by_bytes`	Global I/O consumers, grouped by bytes
`io_global_by_wait_by_latency`, `x$io_global_by_wait_by_latency`	Global I/O consumers, grouped by latency
`latest_file_io`, `x$latest_file_io`	Most recent I/O, grouped by file and thread
`memory_by_host_by_current_bytes`, `x$memory_by_host_by_current_bytes`	Memory use, grouped by host
`memory_by_thread_by_current_bytes`, `x$memory_by_thread_by_current_bytes`	Memory use, grouped by thread
`memory_by_user_by_current_bytes`, `x$memory_by_user_by_current_bytes`	Memory use, grouped by user
`memory_global_by_current_bytes`, `x$memory_global_by_current_bytes`	Memory use, grouped by allocation type
`memory_global_total`, `x$memory_global_total`	Total memory use
`metrics`	Server metrics
`processlist`, `x$processlist`	Processlist information
`ps_check_lost_instrumentation`	Variables that have lost instruments
`schema_auto_increment_columns`	`AUTO_INCREMENT` column information
`schema_index_statistics`, `x$schema_index_statistics`	Index statistics
`schema_object_overview`	Types of objects within each schema
`schema_redundant_indexes`	Duplicate or redundant indexes
`schema_table_lock_waits`, `x$schema_table_lock_waits`	Sessions waiting for metadata locks
`schema_table_statistics`, `x$schema_table_statistics`	Table statistics
`schema_table_statistics_with_buffer`, `x$schema_table_statistics_with_buffer`	Table statistics, including `InnoDB` buffer pool statistics
`schema_tables_with_full_table_scans`, `x$schema_tables_with_full_table_scans`	Tables being accessed with full scans
`schema_unused_indexes`	Indexes not in active use
`session`, `x$session`	Processlist information for user sessions
`session_ssl_status`	Connection SSL information
`statement_analysis`, `x$statement_analysis`	Statement aggregate statistics
`statements_with_errors_or_warnings`, `x$statements_with_errors_or_warnings`	Statements that have produced errors or warnings
`statements_with_full_table_scans`, `x$statements_with_full_table_scans`	Statements that have done full table scans
`statements_with_runtimes_in_95th_percentile`, `x$statements_with_runtimes_in_95th_percentile`	Statements with highest average runtime
`statements_with_sorting`, `x$statements_with_sorting`	Statements that performed sorts
`statements_with_temp_tables`, `x$statements_with_temp_tables`	Statements that used temporary tables
`user_summary`, `x$user_summary`	User statement and connection activity
`user_summary_by_file_io`, `x$user_summary_by_file_io`	File I/O, grouped by user
`user_summary_by_file_io_type`, `x$user_summary_by_file_io_type`	File I/O, grouped by user and event
`user_summary_by_stages`, `x$user_summary_by_stages`	Stage events, grouped by user
`user_summary_by_statement_latency`, `x$user_summary_by_statement_latency`	Statement statistics, grouped by user
`user_summary_by_statement_type`, `x$user_summary_by_statement_type`	Statements executed, grouped by user and statement
`version`	Current `sys` schema and MySQL server versions
`wait_classes_global_by_avg_latency`, `x$wait_classes_global_by_avg_latency`	Wait class average latency, grouped by event class
`wait_classes_global_by_latency`, `x$wait_classes_global_by_latency`	Wait class total latency, grouped by event class
`waits_by_host_by_latency`, `x$waits_by_host_by_latency`	Wait events, grouped by host and event
`waits_by_user_by_latency`, `x$waits_by_user_by_latency`	Wait events, grouped by user and event
`waits_global_by_latency`, `x$waits_global_by_latency`	Wait events, grouped by event
`x$ps_digest_95th_percentile_by_avg_us`	Helper view for 95th-percentile views
`x$ps_digest_avg_latency_distribution`	Helper view for 95th-percentile views
`x$ps_schema_table_statistics_io`	Helper view for table-statistics views
`x$schema_flattened_keys`	Helper view for `schema_redundant_indexes`

Table 27.3 sys Schema Stored Procedures

Procedure Name	Description
`create_synonym_db()`	Create synonym for schema
`diagnostics()`	Collect system diagnostic information
`execute_prepared_stmt()`	Execute prepared statement
`ps_setup_disable_background_threads()`	Disable background thread instrumentation
`ps_setup_disable_consumer()`	Disable consumers
`ps_setup_disable_instrument()`	Disable instruments
`ps_setup_disable_thread()`	Disable instrumentation for thread
`ps_setup_enable_background_threads()`	Enable background thread instrumentation
`ps_setup_enable_consumer()`	Enable consumers
`ps_setup_enable_instrument()`	Enable instruments
`ps_setup_enable_thread()`	Enable instrumentation for thread
`ps_setup_reload_saved()`	Reload saved Performance Schema configuration
`ps_setup_reset_to_default()`	Reset saved Performance Schema configuration
`ps_setup_save()`	Save Performance Schema configuration
`ps_setup_show_disabled()`	Display disabled Performance Schema configuration
`ps_setup_show_disabled_consumers()`	Display disabled Performance Schema consumers
`ps_setup_show_disabled_instruments()`	Display disabled Performance Schema instruments
`ps_setup_show_enabled()`	Display enabled Performance Schema configuration
`ps_setup_show_enabled_consumers()`	Display enabled Performance Schema consumers
`ps_setup_show_enabled_instruments()`	Display enabled Performance Schema instruments
`ps_statement_avg_latency_histogram()`	Display statement latency histogram
`ps_trace_statement_digest()`	Trace Performance Schema instrumentation for digest
`ps_trace_thread()`	Dump Performance Schema data for thread
`ps_truncate_all_tables()`	Truncate Performance Schema summary tables
`statement_performance_analyzer()`	Report of statements running on server
`table_exists()`	Whether a table exists

Table 27.4 sys Schema Stored Functions

Function Name	Description
`extract_schema_from_file_name()`	Extract schema name from file path name
`extract_table_from_file_name()`	Extract table name from file path name
`format_bytes()`	Convert byte count to value with units
`format_path()`	Replace data and temp-file directories in path name with symbolic values
`format_statement()`	Truncate long statement to fixed length
`format_time()`	Convert picoseconds value to value with units
`list_add()`	Add item to list
`list_drop()`	Remove item from list
`ps_is_account_enabled()`	Check whether account instrumentation is enabled
`ps_is_consumer_enabled()`	Check whether consumer is enabled
`ps_is_instrument_default_enabled()`	Check whether instrument is enabled
`ps_is_instrument_default_timed()`	Check whether instrument is timed
`ps_is_thread_instrumented()`	Check whether thread is instrumented
`ps_thread_account()`	Return account for thread ID
`ps_thread_id()`	Return thread ID for connection ID
`ps_thread_stack()`	Return event information for thread ID
`ps_thread_trx_info()`	Return transaction information for thread ID
`quote_identifier()`	Return string as quoted identifier
`sys_get_config()`	Return `sys` schema configuration option
`version_major()`	MySQL server major version number
`version_minor()`	MySQL server minor version number
`version_patch()`	MySQL server patch release version number

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Document created the 26/06/2006, last modified the 26/10/2018
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References

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