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Copyright © 2014, Oracle and/or its affiliates. All rights reserved. |
The MySQL SYS Schema
Mark Matthews Consulting Member, Technical Staff MySQL Enterprise Tools, Oracle
Copyright © 2014, Oracle and/or its affiliates. All rights reserved. |
Copyright © 2014, Oracle and/or its affiliates. All rights reserved. |
Safe Harbor Statement
The following is intended to outline our general product direction. It is intended for information purposes only, and may not be incorporated into any contract. It is not a commitment to deliver any material, code, or functionality, and should not be relied upon in making purchasing decisions. The development, release, and timing of any features or functionality described for Oracle’s products remains at the sole discretion of Oracle.
Copyright © 2014, Oracle and/or its affiliates. All rights reserved. |
Program Agenda
PERFORMANCE_SCHEMA in a few slides
Introduction to the MySQL sys schema
Installation
Summary Views
Procedures and Functions
1
2
3
4
5
Copyright © 2014, Oracle and/or its affiliates. All rights reserved. |
Program Agenda
PERFORMANCE_SCHEMA in a few slides
Introduction to the MySQL sys schema
Installation
Summary Views
Procedures and Functions
1
2
3
4
45
Copyright © 2014, Oracle and/or its affiliates. All rights reserved. |
PERFORMANCE_SCHEMA
5
• MySQLd-wide timing/tracing/profiling by Marc Alf, Chris Powers and Mayank Prasad
• Dynamically configurable (what, resolution)
• Non-persistent storage engine, data and configuration in tables
• 5.6 - 554 instrumentation points (including file i/o, statements)
• 5.7 - 983 (so far) instrumentation points (transactions, mdl, stored programs, memory usage, replication, user and status variables)
Copyright © 2014, Oracle and/or its affiliates. All rights reserved. | 6
Copyright © 2014, Oracle and/or its affiliates. All rights reserved. |
Program Agenda
PERFORMANCE_SCHEMA in a few slides
Introduction to the MySQL sys schema
Installation
Summary Views
Procedures and Functions
2
1
3
4
45
Copyright © 2014, Oracle and/or its affiliates. All rights reserved. |
Introduction to the MySQL sys schema
• Originally called “ps_helper”
• A collection of views, procedures and functions, designed to help DBA, Developer, and Ops teams • Implements many of the common day to day DBA and Developer
debugging and tuning use cases
Copyright © 2014, Oracle and/or its affiliates. All rights reserved. |
Why the sys schema?
• Performance Schema exposes a huge amount of data, that can be sliced and diced in many ways • Many of its tables can implement many different use cases when
looking at the raw data • The sys schema layers on top the (sometimes complex) queries in
to a packaged set of easy to use views • The sys schema also layers on a number of functions and
procedures that help format, and record the raw data
Copyright © 2014, Oracle and/or its affiliates. All rights reserved. |
Program Agenda
PERFORMANCE_SCHEMA in a few slides
Introduction to the MySQL sys schema
Installation
Summary Views
Procedures and Functions
3
1
2
4
44
Copyright © 2014, Oracle and/or its affiliates. All rights reserved. |
Installation from the command line
• $ git clone https://github.com/MarkLeith/mysql-sys.git /tmp/sys
• $ cd /tmp/sys • $ mysql -u user -p < sys_<version>.sql
<version> can be 56 or 57, for 5.6 and 5.7 respectively
Copyright © 2014, Oracle and/or its affiliates. All rights reserved. |
Installation from MySQL Workbench 6.1+
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select * from sys.version;
+-------------+---------------+
| sys_version | mysql_version |
+-------------+---------------+
| 1.1.0 | 5.6.17 |
+-------------+---------------+
13
Checking sys is loadedselect *
from sys.schema_object_overview
where db = 'sys';
+-----+-------------+-------+
| db | object_type | count |
+-----+-------------+-------+
| sys | VIEW | 78 |
| sys | PROCEDURE | 22 |
| sys | FUNCTION | 11 |
+-----+-------------+-------+
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Or simply use MySQL-5.7
14
The “sys” schema was integrated into MySQL 5.7 as of 5.7.7!
Copyright © 2014, Oracle and/or its affiliates. All rights reserved. |
Program Agenda
PERFORMANCE_SCHEMA in a few slides
Introduction to the MySQL sys schema
Installation
Summary Views
Procedures and Functions
4
1
2
3
45
Copyright © 2014, Oracle and/or its affiliates. All rights reserved. |
MySQL sys views
• Reference set of views solving various administrator use cases • Simple views, create/copy your own, sys is not “locked down”
• Build upon both performance_schema and INFORMATION_SCHEMA • Both formatted and raw views are available • All raw views are prefixed with x$ • Raw views are there for tools to poll
• Formatted views are for humans and the command line
Copyright © 2014, Oracle and/or its affiliates. All rights reserved. |
• High level user/host overviews • Breakdowns by: • IO usage • Stages • Statement details
• Following show users only
17
User / Host Summary Views
user_summary user_summary_by_file_io user_summary_by_file_io_type user_summary_by_stages user_summary_by_statement_latency user_summary_by_statement_type host_summary host_summary_by_file_io host_summary_by_file_io_type host_summary_by_stages host_summary_by_statement_latency host_summary_by_statement_type
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user_summary viewmysql> select * from user_summary\G*************************** 1. row *************************** user: mark statements: 3072 statement_latency: 1.77 s statement_avg_latency: 575.29 us table_scans: 7 file_ios: 20043 file_io_latency: 346.79 ms current_connections: 1 total_connections: 1 unique_hosts: 1 current_memory: 515.81 KiBtotal_memory_allocated: 30.69 MiB
MySQL 5.7.4+
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user_summary_by_file_io_type view
mysql> select * from user_summary_by_file_io_type;+------+--------------------------------------+---------+-------------+-------------+| user | event_name | total | latency | max_latency |+------+--------------------------------------+---------+-------------+-------------+| mark | wait/io/file/myisam/dfile | 19540 | 215.20 ms | 120.79 ms || mark | wait/io/file/myisam/kfile | 501 | 131.58 ms | 57.74 ms || mark | wait/io/file/sql/dbopt | 2 | 17.29 us | 9.17 us || root | wait/io/file/innodb/innodb_log_file | 2079432 | 00:28:27.62 | 1.30 s || root | wait/io/file/myisam/kfile | 5195927 | 00:17:07.33 | 1.17 s || root | wait/io/file/myisam/dfile | 1533813 | 00:07:27.59 | 1.18 s || root | wait/io/file/sql/binlog | 3517008 | 00:03:07.34 | 1.42 s || root | wait/io/file/innodb/innodb_data_file | 20720 | 00:02:37.81 | 492.23 ms || root | wait/io/file/sql/FRM | 41412 | 3.17 s | 80.43 ms || root | wait/io/file/sql/dbopt | 110993 | 1.23 s | 63.27 ms |
Copyright © 2014, Oracle and/or its affiliates. All rights reserved. |
user_summary_by_statement_latency view
mysql> select * from user_summary_by_statement_latency\G*************************** 1. row *************************** user: mark total: 176total_latency: 1.26 s max_latency: 583.33 ms lock_latency: 216.95 ms rows_sent: 311rows_examined: 307rows_affected: 0 full_scans: 7
Copyright © 2014, Oracle and/or its affiliates. All rights reserved. |
user_summary_by_statement_type view
mysql> select * from user_summary_by_statement_type\G*************************** 1. row *************************** user: mark statement: commit total: 2463190total_latency: 13.33h max_latency: 12.18 s lock_latency: 0 ps rows_sent: 0rows_examined: 0rows_affected: 0 full_scans: 0
Copyright © 2014, Oracle and/or its affiliates. All rights reserved. |
• IO by current threads • Global summaries by file and
class, aggregating by bytes or latency • Stream of last file IO events in
raw form
22
IO Summary Views
io_by_thread_by_latency io_global_by_file_by_bytes io_global_by_file_by_latency io_global_by_wait_by_bytes io_global_by_wait_by_latency
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io_by_thread_by_latency viewmysql> select * from io_by_thread_by_latency\G*************************** 1. row *************************** user: main total: 1193 total_latency: 136.45 ms min_latency: 731.38 ns avg_latency: 269.99 us max_latency: 20.72 ms thread_id: 1processlist_id: NULL*************************** 2. row *************************** user: root@localhost total: 533 total_latency: 53.81 ms min_latency: 780.39 ns avg_latency: 8.41 ms max_latency: 25.06 ms thread_id: 23processlist_id: 4
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io_global_by_file_by_latency view
mysql> select * from io_global_by_file_by_latency limit 1\G*************************** 1. row *************************** file: @@datadir/ibdata1 total: 1395714total_latency: 00:28:53.06 count_read: 1006 read_latency: 4.51 s count_write: 1326529write_latency: 33.39 s count_misc: 68179 misc_latency: 00:28:15.16
Copyright © 2014, Oracle and/or its affiliates. All rights reserved. |
latest_file_io viewmysql> select * from latest_file_io;+-----------------------------+----------------------------------+-----------+-----------+-----------+| thread | file | latency | operation | requested |+-----------------------------+----------------------------------+-----------+-----------+-----------+| root@localhost:63153:179371 | @@datadir/ib_logfile1 | 7.16 us | lock | NULL || root@localhost:63153:179371 | @@datadir/ib_logfile1 | 6.16 us | write | 1.50 KiB || root@localhost:63153:179371 | @@datadir/ib_logfile1 | 14.36 ms | sync | NULL || root@localhost:63153:179371 | @@datadir/cerberus-bin.000012 | 28.25 us | write | 905 bytes || root@localhost:63177:179394 | @@datadir/ib_logfile1 | 15.25 us | write | 1.00 KiB || root@localhost:57487:3 | @@datadir/cerberus-bin.000012 | 32.12 us | read | 905 bytes || root@localhost:63177:179394 | @@datadir/ib_logfile1 | 6.65 us | write | 1.00 KiB || root@localhost:63177:179394 | @@datadir/ib_logfile1 | 213.32 us | sync | NULL || root@localhost:63177:179394 | @@datadir/ib_logfile1 | 17.27 us | write | 1.00 KiB || root@localhost:63177:179394 | @@datadir/ib_logfile1 | 286.01 us | sync | NULL || root@localhost:63177:179394 | @@datadir/cerberus-bin.000012 | 18.77 us | write | 601 bytes || root@localhost:57487:3 | @@datadir/cerberus-bin.000012 | 7.55 us | read | 601 bytes || root@localhost:63177:179394 | @@datadir/ib_logfile1 | 10.67 us | write | 1.00 KiB || root@localhost:63177:179394 | @@datadir/ib_logfile1 | 200.28 us | sync | NULL || root@localhost:63177:179394 | @@datadir/cerberus-bin.000012 | 12.91 us | write | 601 bytes || root@localhost:57487:3 | @@datadir/cerberus-bin.000012 | 6.47 us | read | 601 bytes || root@localhost:63177:179394 | @@datadir/ib_logfile1 | 9.22 us | write | 1.50 KiB |……
Copyright © 2014, Oracle and/or its affiliates. All rights reserved. |
• Object overview • Table usage statistics • Index usage statistics • Following show users only
26
Schema Analysis Views
schema_index_statistics schema_object_overview schema_table_statistics schema_table_statistics_with_buffer schema_tables_with_full_table_scans schema_unused_indexes
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schema_table_statistics viewmysql> select * from schema_table_statistics limit 1\G*************************** 1. row *************************** table_schema: mem__quan table_name: normalized_statements_by_server_by_schema_data total_latency: 00:55:07.80 rows_fetched: 239685 fetch_latency: 17.10 s rows_inserted: 1102895 insert_latency: 00:52:18.10 rows_updated: 55910 update_latency: 00:02:28.62 rows_deleted: 17899 delete_latency: 3.98 s
io_read_requests: 20639 io_read: 324.94 MiB io_read_latency: 00:03:04.10io_write_requests: 1965973 io_write: 40.36 GiB io_write_latency: 25.46 s io_misc_requests: 18217 io_misc_latency: 00:14:06.02
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schema_index_statistics view
mysql> select * from schema_index_statistics limit 1\G*************************** 1. row *************************** table_schema: mem__inventory table_name: mysqlconnectionconfiguration index_name: PRIMARY rows_selected: 131399select_latency: 00:07:05.03 rows_inserted: 0insert_latency: 0 ps rows_updated: 41608update_latency: 21.96 s rows_deleted: 0delete_latency: 0 ps
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schema_tables_with_full_table_scans view
mysql> select * from schema_tables_with_full_table_scans limit 10;+--------------------+--------------------------------+-------------------+-----------+| object_schema | object_name | rows_full_scanned | latency |+--------------------+--------------------------------+-------------------+-----------+| mem30__instruments | fsstatistics | 10207042 | 13.10 s || mem30__instruments | preparedstatementapidata | 436428 | 973.27 ms || mem30__instruments | mysqlprocessactivity | 411702 | 282.07 ms || mem30__instruments | querycachequeriesincachedata | 374011 | 767.15 ms || mem30__instruments | rowaccessesdata | 322321 | 1.55 s || mem30__instruments | connectionsmaxdata | 301242 | 857.63 ms || mem30__instruments | innodbdatadictionarymemorydata | 292564 | 495.38 ms || mem30__instruments | innodbbufferpooldata | 277112 | 1.95 s || mem30__instruments | avgrowaccessesdata | 269236 | 1.25 s || mem30__instruments | innodbrowdetailsdata | 248208 | 653.25 ms |+--------------------+--------------------------------+-------------------+-----------+
Copyright © 2014, Oracle and/or its affiliates. All rights reserved. |
schema_unused_indexes view
mysql> select * from schema_unused_indexes limit 10;+--------------------+-----------------------------------+--------------------+| object_schema | object_name | index_name |+--------------------+-----------------------------------+--------------------+| mem30__bean_config | plists | path || mem30__config | group_selections | name || mem30__config | notification_groups | name || mem30__config | user_form_defaults | FKC1AEF1F9E7EE2CFB || mem30__enterprise | whats_new_entries | entryId || mem30__events | action_logs | policyId || mem30__events | action_logs | eventId || mem30__events | action_logs | ts || mem30__events | advisor_scopes_advisorcategoryids | FKF0CB0DB962CAB4 || mem30__events | advisor_scopes_advisorclassids | FK650AF1BF962CAB4 |+--------------------+-----------------------------------+--------------------+
You should ensure you have representative time frame before taking any actions!
Copyright © 2014, Oracle and/or its affiliates. All rights reserved. |
• Wait summaries by class • Wait details per: • User • Host • Globally
31
Wait Analysis Views
wait_classes_global_by_avg_latency wait_classes_global_by_latency waits_by_host_by_latency waits_by_user_by_latency waits_global_by_latency
Copyright © 2014, Oracle and/or its affiliates. All rights reserved. |
waits_global_by_latency view
mysql> select * from waits_global_by_latency limit 10;+--------------------------------------+----------+---------------+-------------+-------------+| events | total | total_latency | avg_latency | max_latency |+--------------------------------------+----------+---------------+-------------+-------------+| wait/io/table/sql/handler | 24196659 | 1.75h | 259.72 us | 2.29 s || wait/io/file/innodb/innodb_data_file | 5964255 | 1.36h | 822.01 us | 1.49 s || wait/io/file/innodb/innodb_log_file | 2272647 | 00:36:41.37 | 968.64 us | 1.30 s || wait/io/file/myisam/kfile | 5463587 | 00:18:14.16 | 200.26 us | 1.17 s || wait/io/file/myisam/dfile | 1715187 | 00:08:00.18 | 279.96 us | 1.18 s || wait/io/file/sql/binlog | 3722079 | 00:03:23.71 | 54.73 us | 1.42 s || wait/lock/table/sql/handler | 10074274 | 00:01:56.63 | 11.58 us | 186.90 ms || wait/io/socket/sql/client_connection | 3879827 | 25.36 s | 6.54 us | 219.25 ms || wait/io/file/sql/FRM | 43994 | 3.27 s | 74.35 us | 80.43 ms || wait/io/file/sql/dbopt | 116765 | 1.29 s | 11.03 us | 63.27 ms |+--------------------------------------+----------+---------------+-------------+-------------+
InnoDB only instance, this MyISAM IO is all temporary tables, focus tuning there!
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waits_by_user_by_latency view
mysql> select * from waits_by_user_by_latency;+------+--------------------------------------+----------+---------------+-------------+-------------+| user | event | total | total_latency | avg_latency | max_latency |+------+--------------------------------------+----------+---------------+-------------+-------------+| mark | wait/io/file/myisam/dfile | 19540 | 215.20 ms | 11.01 us | 120.79 ms || mark | wait/io/file/myisam/kfile | 501 | 131.58 ms | 262.63 us | 57.74 ms || mark | wait/io/file/sql/dbopt | 2 | 17.29 us | 8.64 us | 9.17 us || root | wait/io/table/sql/handler | 24189319 | 1.74h | 258.77 us | 2.29 s || root | wait/io/file/innodb/innodb_log_file | 2162650 | 00:30:52.87 | 856.76 us | 1.30 s || root | wait/io/file/myisam/kfile | 5460992 | 00:18:12.83 | 200.11 us | 1.17 s || root | wait/io/file/myisam/dfile | 1694624 | 00:07:59.50 | 282.95 us | 1.18 s || root | wait/io/file/sql/binlog | 3711637 | 00:03:23.16 | 54.74 us | 1.42 s || root | wait/io/file/innodb/innodb_data_file | 22577 | 00:03:05.73 | 8.23 ms | 492.23 ms || root | wait/lock/table/sql/handler | 10069000 | 00:01:56.59 | 11.58 us | 186.90 ms |……
root is doing the most temporary table IO
Copyright © 2014, Oracle and/or its affiliates. All rights reserved. |
• Statement overview • Find statements by: • Those with errors • Those with full table scans • Those creating temp tables • Those that cause sorting • With latency in 95th %ile
34
Statement Analysis Views
statement_analysis statements_with_errors_or_warnings statements_with_full_table_scans statements_with_runtimes_in_95th_percentile statements_with_sorting statements_with_temp_tables
Copyright © 2014, Oracle and/or its affiliates. All rights reserved. |
statement_analysis viewmysql> select * from statement_analysis limit 2\G*************************** 1. row *************************** query: INSERT INTO `mem30__quan` . `n ... nDuration` = IF ( VALUES ( ... db: mem full_scan: exec_count: 4657 err_count: 0 warn_count: 0 total_latency: 00:03:57.40 max_latency: 10.54 s avg_latency: 50.98 ms lock_latency: 00:03:00.93 rows_sent: 0 rows_sent_avg: 0 rows_examined: 0rows_examined_avg: 0 rows_affected: 4794rows_affected_avg: 1
tmp_tables: 0 tmp_disk_tables: 0 rows_sorted: 0sort_merge_passes: 0 digest: b98bfe333642e8e4e72c73515810d865 first_seen: 2014-09-24 11:27:01 last_seen: 2014-09-24 11:53:00
Copyright © 2014, Oracle and/or its affiliates. All rights reserved. |
statements_with_errors_or_warnings view
mysql> select * from statements_with_errors_or_warnings limit 1\G*************************** 1. row *************************** query: CREATE TEMPORARY TABLE IF NOT ... _logs` ( `id` INT8 NOT NULL ) db: mem exec_count: 1725 errors: 1725 error_pct: 100.0000 warnings: 0warning_pct: 0.0000 first_seen: 2014-05-20 10:42:32 last_seen: 2014-05-21 18:39:22 digest: 51fb979dbc3910a6294c7cdabd7839c3
Copyright © 2014, Oracle and/or its affiliates. All rights reserved. |
statements_with_temp_tables view
mysql> select * from statements_with_temp_tables limit 1\G*************************** 1. row *************************** query: SELECT * FROM ( SELECT `digest ... ` , `sum_no_index_used` AS ... db: mysql exec_count: 68 total_latency: 2.31 s memory_tmp_tables: 476 disk_tmp_tables: 204avg_tmp_tables_per_query: 7 tmp_tables_to_disk_pct: 43 first_seen: 2014-09-24 11:26:18 last_seen: 2014-09-24 12:33:00 digest: 50761c6a1818824328745d8a136b9ed6
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statements_with_full_table_scans viewmysql> select * from statements_with_full_table_scans limit 1\G*************************** 1. row *************************** query: SELECT `pojotimese0_` . `id` A ... ty_timeseries` `pojotimese0_` db: mem exec_count: 1 total_latency: 940.89 us no_index_used_count: 1no_good_index_used_count: 0 no_index_used_pct: 100 rows_sent: 116 rows_examined: 116 rows_sent_avg: 116 rows_examined_avg: 116 first_seen: 2014-09-24 11:25:03 last_seen: 2014-09-24 11:25:03 digest: f81b5ce10baee9be754cf35fd245a516
Copyright © 2014, Oracle and/or its affiliates. All rights reserved. |
• Better SHOW PROCESSLIST • No mutex contention • Live statistics for query
39
Miscellaneous Views
processlist
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processlist viewmysql> select * from processlist\G*************************** 1. row *************************** thd_id: 7890 conn_id: 7870 user: root@localhost db: mem command: Query state: update time: 0 current_statement: /* mem dbpool.default */ inser ...<truncated> lock_latency: 0 ps rows_examined: 0 rows_sent: 0 rows_affected: 0 tmp_tables: 0
tmp_disk_tables: 0 full_scan: NO last_statement: NULLlast_statement_latency: NULL last_wait: wait/io/table/sql/handler last_wait_latency: Still Waiting source: handler.cc:7274
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Program Agenda
PERFORMANCE_SCHEMA in a few slides
Introduction to the MySQL sys schema
Installation
Summary Views
Procedures and Functions5
2
3
4
1
Copyright © 2014, Oracle and/or its affiliates. All rights reserved. |
• Make output human readable • Format time appropriately • Format bytes appropriately • Truncate output for large
width values for CLI • Extract object names • Dump a thread stack • Check instrumented actors
42
Functions
format_time format_bytes format_path format_statement extract_table_from_file_name extract_schema_from_file_name ps_thread_stack ps_is_account_enabled
Copyright © 2014, Oracle and/or its affiliates. All rights reserved. |
format_time() function
mysql> select format_time(23849723429) as time -> union select format_time(8327423749233) -> union select format_time(83274237492335);+-------------+| time |+-------------+| 23.85 ms || 8.33 s || 00:01:23.27 |+-------------+
Copyright © 2014, Oracle and/or its affiliates. All rights reserved. |
format_bytes() function
mysql> select format_bytes(23423) as bytes -> union select format_bytes(23432423) -> union select format_bytes(42839479283) -> union select format_bytes(2293848203489);+-----------+| bytes |+-----------+| 22.87 KiB || 22.35 MiB || 39.90 GiB || 2.09 TiB |+-----------+
Copyright © 2014, Oracle and/or its affiliates. All rights reserved. |
Performance Schema Config Helper Procedures
• ps_setup_show_disabled() / ps_setup_show_enabled() • ps_setup_disable_thread() / ps_setup_enable_thread() • ps_setup_disable_background_threads() /
ps_setup_enable_background_threads() • ps_setup_disable_instrument() / ps_setup_enable_instrument() • ps_setup_disable_consumer() / ps_setup_enable_consumer() • ps_setup_save() / ps_setup_reload_saved() • ps_setup_reset_to_default() / ps_truncate_all_tables()
Copyright © 2014, Oracle and/or its affiliates. All rights reserved. |
• Dump all P_S data to a dot graph file to trace a thread • Look in the statement history
table to capture more info on a statement digest
46
Statement Tracing Procedures
ps_trace_thread ps_trace_statement_digest ps_statement_avg_latency_histogram
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ps_trace_statement_digest procedure
• ps_trace_statement_digest() analyses live traffic looking for certain statement digest for a period of time • Captures statistics on each matching statement it finds • Returns a report of the captured stats • An overall summary • A break down for the longest running example • An EXPLAIN (if the statement is not truncated)
Copyright © 2014, Oracle and/or its affiliates. All rights reserved. |
ps_trace_statement_digest procedure
• ps_trace_statement_digest() parameters • in_digest The statement digest to analyse • in_runtime How long to run analysis for • in_interval How often to snapshot data • in_start_fresh Whether to truncate P_S tables first • in_auto_enable Whether to auto enable required config
Copyright © 2014, Oracle and/or its affiliates. All rights reserved. |
ps_trace_statement_digest procedure examplemysql> call ps_trace_statement_digest(‘6134e9d6f25eb8e6cddf11f6938f202a’, 60, 1, true, true); +--------------------+ | SUMMARY STATISTICS | +--------------------+ | SUMMARY STATISTICS | +--------------------+ 1 row in set (59.93 sec)
+------------+-----------+-----------+-----------+---------------+------------+------------+ | executions | exec_time | lock_time | rows_sent | rows_examined | tmp_tables | full_scans | +------------+-----------+-----------+-----------+---------------+------------+------------+ | 360 | 1.41 s | 138.39 ms | 720 | 0 | 0 | 0 | +------------+-----------+-----------+-----------+---------------+------------+------------+ 1 row in set (59.93 sec)
+--------------------------------+-------+-----------+ | event_name | count | latency | +--------------------------------+-------+-----------+ | stage/sql/Sending data | 14 | 1.10 s | | stage/sql/update | 198 | 667.34 ms | | stage/sql/removing tmp table | 9 | 240.48 ms | ...
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ps_trace_statement_digest procedure example+---------------------------+ | LONGEST RUNNING STATEMENT | +---------------------------+ | LONGEST RUNNING STATEMENT | +---------------------------+ 1 row in set (59.95 sec)
+-----------+-----------+-----------+-----------+---------------+------------+-----------+ | thread_id | exec_time | lock_time | rows_sent | rows_examined | tmp_tables | full_scan | +-----------+-----------+-----------+-----------+---------------+------------+-----------+ | 23277 | 77.64 ms | 97.00 us | 2 | 0 | 0 | 0 | +-----------+-----------+-----------+-----------+---------------+------------+-----------+ 1 row in set (59.95 sec)
+-------------------------------------------------------------------------------------------+ | sql_text | +-------------------------------------------------------------------------------------------+ | /* mem dbpool.default */ insert into `mem__quan`.`normalized_statements_by_server_by_schema` (firstSeen, lastSeen, normalized_statement_id, `schema`, server, id) values (1378983745000, 1378998600000, x'808ACEB88FC4B45BC47C4FE9D86C7F26', 'mem', '753c939e-1b99-11e3-b6d4-bc761a1f4f2f', x'7CFE81F98B1E3FE0895D1AA2C39B326D') ON DUPLICATE KEY UPDATE ... +-------------------------------------------------------------------------------------------+ ...
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ps_trace_statement_digest procedure example+--------------------------------+----------+ | event_name | latency | +--------------------------------+----------+ | stage/sql/init | 10.41 ms | | stage/sql/checking permissions | 2.35 us | | stage/sql/Opening tables | 10.32 us | | stage/sql/init | 13.53 us | | stage/sql/System lock | 3.66 us | | stage/sql/update | 61.74 ms | | stage/sql/end | 1.11 us | | stage/sql/query end | 1.31 us | | stage/sql/closing tables | 5.44 ms | | stage/sql/freeing items | 23.31 us | +--------------------------------+----------+ 10 rows in set (59.99 sec)
+----+-------------+-------+------+---------------+------+---------+------+------+----------------+ | id | select_type | table | type | possible_keys | key | key_len | ref | rows | Extra | +----+-------------+-------+------+---------------+------+---------+------+------+----------------+ | 1 | SIMPLE | NULL | NULL | NULL | NULL | NULL | NULL | NULL | No tables used | +----+-------------+-------+------+---------------+------+---------+------+------+----------------+ ...
Copyright © 2014, Oracle and/or its affiliates. All rights reserved. |
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