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mariadb/mysql-test/suite/sysschema/t/pr_statement_performance_analyzer.test
Monty b6215b9b20 Update row and key fetch cost models to take into account data copy costs 
Before this patch, when calculating the cost of fetching and using a
row/key from the engine, we took into account the cost of finding a
row or key from the engine, but did not consistently take into account
index only accessed, clustered key or covered keys for all access
paths.

The cost of the WHERE clause (TIME_FOR_COMPARE) was not consistently
considered in best_access_path().  TIME_FOR_COMPARE was used in
calculation in other places, like greedy_search(), but was in some
cases (like scans) done an a different number of rows than was
accessed.

The cost calculation of row and index scans didn't take into account
the number of rows that where accessed, only the number of accepted
rows.

When using a filter, the cost of index_only_reads and cost of
accessing and disregarding 'filtered rows' where not taken into
account, which made filters cost less than there actually where.

To remedy the above, the following key & row fetch related costs
has been added:

- The cost of fetching and using a row is now split into different costs:
  - key + Row fetch cost (as before) but multiplied with the variable
  'optimizer_cache_cost' (default to 0.5). This allows the user to
  tell the optimizer the likehood of finding the key and row in the
  engine cache.
- ROW_COPY_COST, The cost copying a row from the engine to the
  sql layer or creating a row from the join_cache to the record
  buffer. Mostly affects table scan costs.
- ROW_LOOKUP_COST, the cost of fetching a row by rowid.
- KEY_COPY_COST the cost of finding the next key and copying it from
  the engine to the SQL layer. This is used when we calculate the cost
  index only reads. It makes index scans more expensive than before if
  they cover a lot of rows. (main.index_merge_myisam)
- KEY_LOOKUP_COST, the cost of finding the first key in a range.
  This replaces the old define IDX_LOOKUP_COST, but with a higher cost.
- KEY_NEXT_FIND_COST, the cost of finding the next key (and rowid).
  when doing a index scan and comparing the rowid to the filter.
  Before this cost was assumed to be 0.

All of the above constants/variables are now tuned to be somewhat in
proportion of executing complexity to each other.  There is tuning
need for these in the future, but that can wait until the above are
made user variables as that will make tuning much easier.

To make the usage of the above easy, there are new (not virtual)
cost calclation functions in handler:
- ha_read_time(), like read_time(), but take optimizer_cache_cost into
  account.
- ha_read_and_copy_time(), like ha_read_time() but take into account
  ROW_COPY_TIME
- ha_read_and_compare_time(), like ha_read_and_copy_time() but take
  TIME_FOR_COMPARE into account.
- ha_rnd_pos_time(). Read row with row id, taking ROW_COPY_COST
  into account.  This is used with filesort where we don't need
  to execute the WHERE clause again.
- ha_keyread_time(), like keyread_time() but take
  optimizer_cache_cost into account.
- ha_keyread_and_copy_time(), like ha_keyread_time(), but add
  KEY_COPY_COST.
- ha_key_scan_time(), like key_scan_time() but take
  optimizer_cache_cost nto account.
- ha_key_scan_and_compare_time(), like ha_key_scan_time(), but add
  KEY_COPY_COST & TIME_FOR_COMPARE.

I also added some setup costs for doing different types of scans and
creating temporary tables (on disk and in memory). This encourages
the optimizer to not use these for simple 'a few row' lookups if
there are adequate key lookup strategies.
- TABLE_SCAN_SETUP_COST, cost of starting a table scan.
- INDEX_SCAN_SETUP_COST, cost of starting an index scan.
- HEAP_TEMPTABLE_CREATE_COST, cost of creating in memory
  temporary table.
- DISK_TEMPTABLE_CREATE_COST, cost of creating an on disk temporary
  table.

When calculating cost of fetching ranges, we had a cost of
IDX_LOOKUP_COST (0.125) for doing a key div for a new range. This is
now replaced with 'io_cost * KEY_LOOKUP_COST (1.0) *
optimizer_cache_cost', which matches the cost we use for 'ref' and
other key lookups. The effect is that the cost is now a bit higher
when we have many ranges for a key.

Allmost all calculation with TIME_FOR_COMPARE is now done in
best_access_path(). 'JOIN::read_time' now includes the full
cost for finding the rows in the table.

In the result files, many of the changes are now again close to what
they where before the "Update cost for hash and cached joins" commit,
as that commit didn't fix the filter cost (too complex to do
everything in one commit).

The above changes showed a lot of a lot of inconsistencies in
optimizer cost calculation. The main objective with the other changes
was to do calculation as similar (and accurate) as possible and to make
different plans more comparable.

Detailed list of changes:

- Calculate index_only_cost consistently and correctly for all scan
  and ref accesses. The row fetch_cost and index_only_cost now
  takes into account clustered keys, covered keys and index
  only accesses.
- cost_for_index_read now returns both full cost and index_only_cost
- Fixed cost calculation of get_sweep_read_cost() to match other
  similar costs. This is bases on the assumption that data is more
  often stored on SSD than a hard disk.
- Replaced constant 2.0 with new define TABLE_SCAN_SETUP_COST.
- Some scan cost estimates did not take into account
  TIME_FOR_COMPARE. Now all scan costs takes this into
  account. (main.show_explain)
- Added session variable optimizer_cache_hit_ratio (default 50%). By
  adjusting this on can reduce or increase the cost of index or direct
  record lookups. The effect of the default is that key lookups is now
  a bit cheaper than before. See usage of 'optimizer_cache_cost' in
  handler.h.
- JOIN_TAB::scan_time() did not take into account index only scans,
  which produced a wrong cost when index scan was used. Changed
  JOIN_TAB:::scan_time() to take into consideration clustered and
  covered keys. The values are now cached and we only have to call
  this function once. Other calls are changed to use the cached
  values.  Function renamed to JOIN_TAB::estimate_scan_time().
- Fixed that most index cost calculations are done the same way and
  more close to 'range' calculations. The cost is now lower than
  before for small data sets and higher for large data sets as we take
  into account how many keys are read (main.opt_trace_selectivity,
  main.limit_rows_examined).
- Ensured that index_scan_cost() ==
  range(scan_of_all_rows_in_table_using_one_range) +
  MULTI_RANGE_READ_INFO_CONST. One effect of this is that if there
  is choice of doing a full index scan and a range-index scan over
  almost the whole table then index scan will be preferred (no
  range-read setup cost).  (innodb.innodb, main.show_explain,
  main.range)
  - Fixed the EQ_REF and REF takes into account clustered and covered
    keys.  This changes some plans to use covered or clustered indexes
    as these are much cheaper.  (main.subselect_mat_cost,
    main.state_tables_innodb, main.limit_rows_examined)
  - Rowid filter setup cost and filter compare cost now takes into
    account fetching and checking the rowid (KEY_NEXT_FIND_COST).
    (main.partition_pruning heap.heap_btree main.log_state)
  - Added KEY_NEXT_FIND_COST to
    Range_rowid_filter_cost_info::lookup_cost to account of the time
    to find and check the next key value against the container
  - Introduced ha_keyread_time(rows) that takes into account finding
    the next row and copying the key value to 'record'
    (KEY_COPY_COST).
  - Introduced ha_key_scan_time() for calculating an index scan over
    all rows.
  - Added IDX_LOOKUP_COST to keyread_time() as a startup cost.
  - Added index_only_fetch_cost() as a convenience function to
    OPT_RANGE.
  - keyread_time() cost is slightly reduced to prefer shorter keys.
    (main.index_merge_myisam)
  - All of the above caused some index_merge combinations to be
    rejected because of cost (main.index_intersect). In some cases
    'ref' where replaced with index_merge because of the low
    cost calculation of get_sweep_read_cost().
  - Some index usage moved from PRIMARY to a covering index.
    (main.subselect_innodb)
- Changed cost calculation of filter to take KEY_LOOKUP_COST and
  TIME_FOR_COMPARE into account.  See sql_select.cc::apply_filter().
  filter parameters and costs are now written to optimizer_trace.
- Don't use matchings_records_in_range() to try to estimate the number
  of filtered rows for ranges. The reason is that we want to ensure
  that 'range' is calculated similar to 'ref'. There is also more work
  needed to calculate the selectivity when using ranges and ranges and
  filtering.  This causes filtering column in EXPLAIN EXTENDED to be
  100.00 for some cases where range cannot use filtering.
  (main.rowid_filter)
- Introduced ha_scan_time() that takes into account the CPU cost of
  finding the next row and copying the row from the engine to
  'record'. This causes costs of table scan to slightly increase and
  some test to changed their plan from ALL to RANGE or ALL to ref.
  (innodb.innodb_mysql, main.select_pkeycache)
  In a few cases where scan time of very small tables have lower cost
  than a ref or range, things changed from ref/range to ALL.
  (main.myisam, main.func_group, main.limit_rows_examined,
  main.subselect2)
- Introduced ha_scan_and_compare_time() which is like ha_scan_time()
  but also adds the cost of the where clause (TIME_FOR_COMPARE).
- Added small cost for creating temporary table for
  materialization. This causes some very small tables to use scan
  instead of materialization.
- Added checking of the WHERE clause (TIME_FOR_COMPARE) of the
  accepted rows to ROR costs in get_best_ror_intersect()
- Removed '- 0.001' from 'join->best_read' and optimize_straight_join()
  to ensure that the 'Last_query_cost' status variable contains the
  same value as the one that was calculated by the optimizer.
- Take avg_io_cost() into account in handler::keyread_time() and
  handler::read_time(). This should have no effect as it's 1.0 by
  default, except for heap that overrides these functions.
- Some 'ref_or_null' accesses changed to 'range' because of cost
  adjustments (main.order_by)
- Added scan type "scan_with_join_cache" for optimizer_trace. This is
  just to show in the trace what kind of scan was used.
- When using 'scan_with_join_cache' take into account number of
  preceding tables (as have to restore all fields for all previous
  table combination when checking the where clause)
  The new cost added is:
  (row_combinations * ROW_COPY_COST * number_of_cached_tables).
  This increases the cost of join buffering in proportion of the
  number of tables in the join buffer. One effect is that full scans
  are now done earlier as the cost is then smaller.
  (main.join_outer_innodb, main.greedy_optimizer)
- Removed the usage of 'worst_seeks' in cost_for_index_read as it
  caused wrong plans to be created; It prefered JT_EQ_REF even if it
  would be much more expensive than a full table scan. A related
  issue was that worst_seeks only applied to full lookup, not to
  clustered or index only lookups, which is not consistent. This
  caused some plans to use index scan instead of eq_ref (main.union)
- Changed federated block size from 4096 to 1500, which is the
  typical size of an IO packet.
- Added costs for reading rows to Federated. Needed as there is no
  caching of rows in the federated engine.
- Added ha_innobase::rnd_pos_time() cost function.
- A lot of extra things added to optimizer trace
  - More costs, especially for materialization and index_merge.
  - Make lables more uniform
  - Fixed a lot of minor bugs
  - Added 'trace_started()' around a lot of trace blocks.
- When calculating ORDER BY with LIMIT cost for using an index
  the cost did not take into account the number of row retrivals
  that has to be done or the cost of comparing the rows with the
  WHERE clause. The cost calculated would be just a fraction of
  the real cost. Now we calculate the cost as we do for ranges
  and 'ref'.
- 'Using index for group-by' is used a bit more than before as
  now take into account the WHERE clause cost when comparing
  with 'ref' and prefer the method with fewer row combinations.
  (main.group_min_max).

Bugs fixed:
- Fixed that we don't calculate TIME_FOR_COMPARE twice for some plans,
  like in optimize_straight_join() and greedy_search()
- Fixed bug in save_explain_data where we could test for the wrong
  index when displaying 'Using index'. This caused some old plans to
  show 'Using index'.  (main.subselect_innodb, main.subselect2)
- Fixed bug in get_best_ror_intersect() where 'min_cost' was not
  updated, and the cost we compared with was not the one that was
  used.
- Fixed very wrong cost calculation for priority queues in
  check_if_pq_applicable(). (main.order_by now correctly uses priority
  queue)
- When calculating cost of EQ_REF or REF, we added the cost of
  comparing the WHERE clause with the found rows, not all row
  combinations. This made ref and eq_ref to be regarded way to cheap
  compared to other access methods.
- FORCE INDEX cost calculation didn't take into account clustered or
  covered indexes.
- JT_EQ_REF cost was estimated as avg_io_cost(), which is half the
  cost of a JT_REF key. This may be true for InnoDB primary key, but
  not for other unique keys or other engines. Now we use handler
  function to calculate the cost, which allows us to handle
  consistently clustered, covered keys and not covered keys.
- ha_start_keyread() didn't call extra_opt() if keyread was already
  enabled but still changed the 'keyread' variable (which is wrong).
  Fixed by not doing anything if keyread is already enabled.
- multi_range_read_info_cost() didn't take into account io_cost when
  calculating the cost of ranges.
- fix_semijoin_strategies_for_picked_join_order() used the wrong
  record_count when calling best_access_path() for SJ_OPT_FIRST_MATCH
  and SJ_OPT_LOOSE_SCAN.
- Hash joins didn't provide correct best_cost to the upper level, which
  means that the cost for hash_joins more expensive than calculated
  in best_access_path (a difference of 10x * TIME_OF_COMPARE).
  This is fixed in the new code thanks to that we now include
  TIME_OF_COMPARE cost in 'read_time'.

Other things:
- Added some 'if (thd->trace_started())' to speed up code
- Removed not used function Cost_estimate::is_zero()
- Simplified testing of HA_POS_ERROR in get_best_ror_intersect().
  (No cost changes)
- Moved ha_start_keyread() from join_read_const_table() to join_read_const()
  to enable keyread for all types of JT_CONST tables.
- Made a few very short functions inline in handler.h

Notes:
- In main.rowid_filter the join order of order and lineitem is swapped.
  This is because the cost of doing a range fetch of lineitem(98 rows) is
  almost as big as the whole join of order,lineitem. The filtering will
  also ensure that we only have to do very small key fetches of the rows
  in lineitem.
- main.index_merge_myisam had a few changes where we are now using
  less keys for index_merge. This is because index scans are now more
  expensive than before.
- handler->optimizer_cache_cost is updated in ha_external_lock().
  This ensures that it is up to date per statements.
  Not an optimal solution (for locked tables), but should be ok for now.
- 'DELETE FROM t1 WHERE t1.a > 0 ORDER BY t1.a' does not take cost of
  filesort into consideration when table scan is chosen.
  (main.myisam_explain_non_select_all)
- perfschema.table_aggregate_global_* has changed because an update
  on a table with 1 row will now use table scan instead of key lookup.

TODO in upcomming commits:
- Fix selectivity calculation for ranges with and without filtering and
  when there is a ref access but scan is chosen.
  For this we have to store the lowest known value for
  'accepted_records' in the OPT_RANGE structure.
- Change that records_read does not include filtered rows.
- test_if_cheaper_ordering() needs to be updated to properly calculate
  costs. This will fix tests like main.order_by_innodb,
  main.single_delete_update
- Extend get_range_limit_read_cost() to take into considering
  cost_for_index_read() if there where no quick keys. This will reduce
  the computed cost for ORDER BY with LIMIT in some cases.
  (main.innodb_ext_key)
- Fix that we take into account selectivity when counting the number
  of rows we have to read when considering using a index table scan to
  resolve ORDER BY.
- Add new calculation for rnd_pos_time() where we take into account the
  benefit of reading multiple rows from the same page.
2023-02-02 21:43:30 +03:00

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########### suite/sysschema/t/pr_statement_performance_analyzer.test #############
# #
# Testing of of the sys.statement_performance_analyzer() procedure #
# #
# Creation: #
# 2015-07-28 jkrogh Implement this test as part of #
# WL#7804 REPORT FOR SUPPORT #
# #
##################################################################################
-- source include/not_embedded.inc
# Performance schema tracks prepared statements separately, and does not
# yet have a summary view that we can use for this view.
# Until then, we disable this test with --ps-protocol
-- source include/no_protocol.inc
# Bug #23290879 - For reasons unknown to man this test fails randomly only on Windows
#-- source include/not_windows.inc
use test;
--disable_warnings
DROP TABLE IF EXISTS t1;
DROP TEMPORARY TABLE IF EXISTS tmp_digests_ini;
DROP VIEW IF EXISTS view_digests;
--enable_warnings
# Create a table
CREATE TABLE t1 (id INT PRIMARY KEY, val int);
# Create a new connection to make the actual changes
# Create the connection now to ensure queries like "SELECT @@`version_comment` LIMIT 1" are excluded
connect (con1,localhost,root,,);
connection con1;
use test;
--let $con1_thread_id= `SELECT THREAD_ID FROM performance_schema.threads WHERE PROCESSLIST_ID = CONNECTION_ID()`
# Disable instrumentation for all other threads other than the one that will
# my monitored for this test ($con1_thread_id)
connection default;
--disable_result_log
--replace_result $con1_thread_id CON1_THREAD_ID
eval UPDATE performance_schema.threads SET INSTRUMENTED = IF(THREAD_ID = $con1_thread_id, 'YES', 'NO');
CALL sys.ps_setup_enable_consumer('events_statements_history_long');
CALL sys.ps_truncate_all_tables(FALSE);
--enable_result_log
# Start with some initial queries
# Don't rely on the digests being constant across MySQL releases and versions, so find the
# digest for each of the three queries by getting the last event from performance_schema.events_statements_current
# for the con1 connection.
connection con1;
INSERT INTO t1 VALUES (1, 0);
connection default;
--let $wait_condition= SELECT SUBSTRING(SQL_TEXT, 1, 7) = 'INSERT ' FROM performance_schema.events_statements_current WHERE THREAD_ID = $con1_thread_id AND DIGEST IS NOT NULL
--source include/wait_condition.inc
--let $digest_insert= `SELECT DIGEST FROM performance_schema.events_statements_current WHERE THREAD_ID = $con1_thread_id ORDER BY EVENT_ID DESC LIMIT 1`
--let $query_insert= `SELECT sys.format_statement(DIGEST_TEXT) FROM performance_schema.events_statements_current WHERE THREAD_ID = $con1_thread_id ORDER BY EVENT_ID DESC LIMIT 1`
connection con1;
UPDATE t1 SET val = 1 WHERE id = 1;
connection default;
--let $wait_condition= SELECT SUBSTRING(SQL_TEXT, 1, 7) = 'UPDATE ' FROM performance_schema.events_statements_current WHERE THREAD_ID = $con1_thread_id AND DIGEST IS NOT NULL
--source include/wait_condition.inc
--let $digest_update= `SELECT DIGEST FROM performance_schema.events_statements_current WHERE THREAD_ID = $con1_thread_id ORDER BY EVENT_ID DESC LIMIT 1`
--let $query_update= `SELECT sys.format_statement(DIGEST_TEXT) FROM performance_schema.events_statements_current WHERE THREAD_ID = $con1_thread_id ORDER BY EVENT_ID DESC LIMIT 1`
connection con1;
SELECT t1a.* FROM t1 AS t1a LEFT OUTER JOIN (SELECT * FROM t1 AS t1b1 INNER JOIN t1 AS t1b2 USING (id, val)) AS t1b ON t1b.id > t1a.id ORDER BY t1a.val, t1a.id;
connection default;
--let $wait_condition= SELECT SUBSTRING(SQL_TEXT, 1, 7) = 'SELECT ' FROM performance_schema.events_statements_current WHERE THREAD_ID = $con1_thread_id AND DIGEST IS NOT NULL
--source include/wait_condition.inc
--let $digest_select= `SELECT DIGEST FROM performance_schema.events_statements_current WHERE THREAD_ID = $con1_thread_id ORDER BY EVENT_ID DESC LIMIT 1`
--let $query_select= `SELECT sys.format_statement(DIGEST_TEXT) FROM performance_schema.events_statements_current WHERE THREAD_ID = $con1_thread_id ORDER BY EVENT_ID DESC LIMIT 1`
# Enable to debug if some digests are not found
# --output /tmp/digest
# --eval SELECT '$digest_insert' AS DigestInsert, '$digest_update' AS DigestUpdate, '$digest_select' AS DigestSelect
# --output /tmp/digest_text
# --eval SELECT '$query_insert' AS DigestInsert, '$query_update' AS DigestUpdate, '$query_select' AS DigestSelect
# --output /tmp/ps_history
# SELECT THREAD_ID, EVENT_ID, END_EVENT_ID, DIGEST, SQL_TEXT FROM performance_schema.events_statements_history_long ORDER BY EVENT_ID;
# Start collecting data
CALL sys.statement_performance_analyzer('create_tmp', 'test.tmp_digests_ini', NULL);
CALL sys.statement_performance_analyzer('snapshot', NULL, NULL);
CALL sys.statement_performance_analyzer('save', 'test.tmp_digests_ini', NULL);
# Make sure the last_seen times will be different from the SELECT statement's first_seen.
DO SLEEP(1.2);
# Make some more changes
connection con1;
INSERT INTO t1 VALUES (2, 0);
UPDATE t1 SET val = 1 WHERE id = 2;
SELECT t1a.* FROM t1 AS t1a LEFT OUTER JOIN (SELECT * FROM t1 AS t1b1 INNER JOIN t1 AS t1b2 USING (id, val)) AS t1b ON t1b.id > t1a.id ORDER BY t1a.val, t1a.id;
disconnect con1;
# Make the second collection of data and create the output
connection default;
# Make sure all of the queries executing in con1 has been recorded in performance_schema.events_statements_summary_by_digest
# before continuing with the actual tests of pr_statement_performance_analyzer()
--let $wait_condition= SELECT COUNT_STAR = 2 FROM performance_schema.events_statements_summary_by_digest WHERE DIGEST = '$digest_select'
--source include/wait_condition.inc
# Get all values to be used in replacements now to minimize the risk of the
# values disappearing out of the performance_schema tables
--let $o_upd_total_latency= `SELECT total_latency FROM sys.statement_analysis WHERE db = 'test' AND digest = '$digest_update'`
--let $o_upd_max_latency= `SELECT max_latency FROM sys.statement_analysis WHERE db = 'test' AND digest = '$digest_update'`
--let $o_upd_avg_latency= `SELECT avg_latency FROM sys.statement_analysis WHERE db = 'test' AND digest = '$digest_update'`
--let $o_upd_first_seen= `SELECT first_seen FROM sys.statement_analysis WHERE db = 'test' AND digest = '$digest_update'`
--let $o_upd_last_seen= `SELECT last_seen FROM sys.statement_analysis WHERE db = 'test' AND digest = '$digest_update'`
--let $o_sel_total_latency= `SELECT total_latency FROM sys.statement_analysis WHERE db = 'test' AND digest = '$digest_select'`
--let $o_sel_max_latency= `SELECT max_latency FROM sys.statement_analysis WHERE db = 'test' AND digest = '$digest_select'`
--let $o_sel_avg_latency= `SELECT avg_latency FROM sys.statement_analysis WHERE db = 'test' AND digest = '$digest_select'`
--let $o_sel_first_seen= `SELECT first_seen FROM sys.statement_analysis WHERE db = 'test' AND digest = '$digest_select'`
--let $o_sel_last_seen= `SELECT last_seen FROM sys.statement_analysis WHERE db = 'test' AND digest = '$digest_select'`
--let $o_ins_total_latency= `SELECT total_latency FROM sys.statement_analysis WHERE db = 'test' AND digest = '$digest_insert'`
--let $o_ins_max_latency= `SELECT max_latency FROM sys.statement_analysis WHERE db = 'test' AND digest = '$digest_insert'`
--let $o_ins_avg_latency= `SELECT avg_latency FROM sys.statement_analysis WHERE db = 'test' AND digest = '$digest_insert'`
--let $o_ins_first_seen= `SELECT first_seen FROM sys.statement_analysis WHERE db = 'test' AND digest = '$digest_insert'`
--let $o_ins_last_seen= `SELECT last_seen FROM sys.statement_analysis WHERE db = 'test' AND digest = '$digest_insert'`
--let $o_upd_lock_latency= `SELECT lock_latency FROM sys.statement_analysis WHERE db = 'test' AND digest = '$digest_update'`
--let $o_sel_lock_latency= `SELECT lock_latency FROM sys.statement_analysis WHERE db = 'test' AND digest = '$digest_select'`
--let $o_ins_lock_latency= `SELECT lock_latency FROM sys.statement_analysis WHERE db = 'test' AND digest = '$digest_insert'`
--let $d_upd_total_latency= `SELECT sys.format_time(TIMER_WAIT) FROM performance_schema.events_statements_history_long WHERE CURRENT_SCHEMA = 'test' AND DIGEST = '$digest_update' ORDER BY EVENT_ID DESC LIMIT 1`
--let $d_sel_total_latency= `SELECT sys.format_time(TIMER_WAIT) FROM performance_schema.events_statements_history_long WHERE CURRENT_SCHEMA = 'test' AND DIGEST = '$digest_select' ORDER BY EVENT_ID DESC LIMIT 1`
--let $d_ins_total_latency= `SELECT sys.format_time(TIMER_WAIT) FROM performance_schema.events_statements_history_long WHERE CURRENT_SCHEMA = 'test' AND DIGEST = '$digest_insert' ORDER BY EVENT_ID DESC LIMIT 1`
--let $d_upd_tock_latency= `SELECT sys.format_time(LOCK_TIME) FROM performance_schema.events_statements_history_long WHERE CURRENT_SCHEMA = 'test' AND DIGEST = '$digest_update' ORDER BY EVENT_ID DESC LIMIT 1`
--let $d_sel_tock_latency= `SELECT sys.format_time(LOCK_TIME) FROM performance_schema.events_statements_history_long WHERE CURRENT_SCHEMA = 'test' AND DIGEST = '$digest_select' ORDER BY EVENT_ID DESC LIMIT 1`
--let $d_ins_tock_latency= `SELECT sys.format_time(LOCK_TIME) FROM performance_schema.events_statements_history_long WHERE CURRENT_SCHEMA = 'test' AND DIGEST = '$digest_insert' ORDER BY EVENT_ID DESC LIMIT 1`
CALL sys.statement_performance_analyzer('snapshot', NULL, NULL);
# Do a sanity check to ensure we are assuming the queries has the digests they have and that there is nothing else in the events_statements_summary_by_digest than there actually is.
--replace_result $digest_insert DIGEST_INSERT $digest_update DIGEST_UPDATE $digest_select DIGEST_SELECT
--sorted_result
SELECT DIGEST, COUNT_STAR FROM performance_schema.events_statements_summary_by_digest;
# with_runtimes_in_95th_percentile
# It is unknown what the result will be since the execution times for each query are unknown
# So just check that no warning or error occurs
--disable_result_log
CALL sys.statement_performance_analyzer('overall', NULL, 'with_runtimes_in_95th_percentile');
CALL sys.statement_performance_analyzer('delta', 'test.tmp_digests_ini', 'with_runtimes_in_95th_percentile');
--enable_result_log
# analysis - as there's no control of the various latencies, it may be the same for two or more of the queries.
# So replace_result cannot be used to give it a unique value. Instead just use LATENCY for all rows.
--replace_result $query_insert QUERY_INSERT $query_select QUERY_SELECT $query_update QUERY_UPDATE $digest_insert DIGEST_INSERT $digest_update DIGEST_UPDATE $digest_select DIGEST_SELECT $o_upd_total_latency LATENCY $o_upd_max_latency LATENCY $o_upd_avg_latency LATENCY $o_upd_lock_latency LATENCY $o_upd_first_seen FIRST_SEEN $o_upd_last_seen LAST_SEEN $o_sel_total_latency LATENCY $o_sel_max_latency LATENCY $o_sel_avg_latency LATENCY $o_sel_lock_latency LATENCY $o_sel_first_seen FIRST_SEEN $o_sel_last_seen LAST_SEEN $o_ins_total_latency LATENCY $o_ins_max_latency LATENCY $o_ins_avg_latency LATENCY $o_ins_lock_latency LATENCY $o_ins_first_seen FIRST_SEEN $o_ins_last_seen LAST_SEEN
--sorted_result
CALL sys.statement_performance_analyzer('overall', NULL, 'analysis');
--replace_result $query_insert QUERY_INSERT $query_select QUERY_SELECT $query_update QUERY_UPDATE $digest_insert DIGEST_INSERT $digest_update DIGEST_UPDATE $digest_select DIGEST_SELECT $d_upd_total_latency LATENCY $o_upd_max_latency LATENCY $o_upd_first_seen FIRST_SEEN $o_upd_last_seen LAST_SEEN $d_upd_tock_latency LATENCY $d_sel_total_latency LATENCY $o_sel_max_latency LATENCY $o_sel_first_seen FIRST_SEEN $o_sel_last_seen LAST_SEEN $d_sel_tock_latency LATENCY $d_ins_total_latency LATENCY $o_ins_max_latency LATENCY $o_ins_first_seen FIRST_SEEN $o_ins_last_seen LAST_SEEN $d_ins_tock_latency LATENCY
--sorted_result
CALL sys.statement_performance_analyzer('delta', 'test.tmp_digests_ini', 'analysis');
# Should give an empty result except for the banner generated by the procedure
CALL sys.statement_performance_analyzer('overall', NULL, 'with_errors_or_warnings');
CALL sys.statement_performance_analyzer('delta', 'test.tmp_digests_ini', 'with_errors_or_warnings');
--replace_column 4 LATENCY
--replace_result $query_select QUERY_SELECT $digest_select DIGEST_SELECT $o_sel_first_seen FIRST_SEEN $o_sel_last_seen LAST_SEEN $digest_update DIGEST_UPDATE $query_update QUERY_UPDATE $o_upd_first_seen FIRST_SEEN $o_upd_last_seen LAST_SEEN
CALL sys.statement_performance_analyzer('overall', NULL, 'with_full_table_scans');
--replace_result $query_select QUERY_SELECT $digest_select DIGEST_SELECT $d_sel_total_latency LATENCY $o_sel_first_seen FIRST_SEEN $o_sel_last_seen LAST_SEEN
CALL sys.statement_performance_analyzer('delta', 'test.tmp_digests_ini', 'with_full_table_scans');
--replace_result $query_select QUERY_SELECT $digest_select DIGEST_SELECT $o_sel_total_latency LATENCY $o_sel_first_seen FIRST_SEEN $o_sel_last_seen LAST_SEEN
CALL sys.statement_performance_analyzer('overall', NULL, 'with_sorting');
--replace_result $query_select QUERY_SELECT $digest_select DIGEST_SELECT $d_sel_total_latency LATENCY $o_sel_first_seen FIRST_SEEN $o_sel_last_seen LAST_SEEN
CALL sys.statement_performance_analyzer('delta', 'test.tmp_digests_ini', 'with_sorting');
--replace_result $query_select QUERY_SELECT $digest_select DIGEST_SELECT $o_sel_total_latency LATENCY $o_sel_first_seen FIRST_SEEN $o_sel_last_seen LAST_SEEN
CALL sys.statement_performance_analyzer('overall', NULL, 'with_temp_tables');
--replace_result $query_select QUERY_SELECT $digest_select DIGEST_SELECT $d_sel_total_latency LATENCY $o_sel_first_seen FIRST_SEEN $o_sel_last_seen LAST_SEEN
CALL sys.statement_performance_analyzer('delta', 'test.tmp_digests_ini', 'with_temp_tables');
# Try a custom view
# Sort by the query, then we know the order will be INSERT, SELECT, UPDATE
CREATE VIEW test.view_digests AS
SELECT sys.format_statement(DIGEST_TEXT) AS query,
SCHEMA_NAME AS db,
COUNT_STAR AS exec_count,
sys.format_time(SUM_TIMER_WAIT) AS total_latency,
sys.format_time(AVG_TIMER_WAIT) AS avg_latency,
ROUND(IFNULL(SUM_ROWS_SENT / NULLIF(COUNT_STAR, 0), 0)) AS rows_sent_avg,
ROUND(IFNULL(SUM_ROWS_EXAMINED / NULLIF(COUNT_STAR, 0), 0)) AS rows_examined_avg,
ROUND(IFNULL(SUM_ROWS_AFFECTED / NULLIF(COUNT_STAR, 0), 0)) AS rows_affected_avg,
DIGEST AS digest
FROM performance_schema.events_statements_summary_by_digest
ORDER BY SUBSTRING(query, 1, 6);
SET @sys.statement_performance_analyzer.view = 'test.view_digests';
--replace_result $query_insert QUERY_INSERT $query_select QUERY_SELECT $query_update QUERY_UPDATE $digest_insert DIGEST_INSERT $digest_update DIGEST_UPDATE $digest_select DIGEST_SELECT $o_upd_total_latency LATENCY $o_upd_avg_latency LATENCY $o_sel_total_latency LATENCY $o_sel_avg_latency LATENCY $o_ins_total_latency LATENCY $o_ins_avg_latency LATENCY
CALL sys.statement_performance_analyzer('overall', NULL, 'custom');
--replace_result $query_insert QUERY_INSERT $query_select QUERY_SELECT $query_update QUERY_UPDATE $digest_insert DIGEST_INSERT $digest_update DIGEST_UPDATE $digest_select DIGEST_SELECT $d_upd_total_latency LATENCY $d_sel_total_latency LATENCY $d_ins_total_latency LATENCY
CALL sys.statement_performance_analyzer('delta', 'test.tmp_digests_ini', 'custom');
# Verify that setting a limit works
SET @sys.statement_performance_analyzer.limit = 2;
--replace_result $query_insert QUERY_INSERT $query_select QUERY_SELECT $digest_insert DIGEST_INSERT $digest_select DIGEST_SELECT $o_ins_total_latency LATENCY $o_ins_avg_latency LATENCY $o_sel_total_latency LATENCY $o_sel_avg_latency LATENCY
CALL sys.statement_performance_analyzer('overall', NULL, 'custom');
# Test for error conditions - some of the errors depend on the sql_mode so set it explicitly
# Which sql_modes are deprecated depends on the release, so disable warnings while setting the sql_mode
# Use non-strict sql_mode - keep NO_AUTO_CREATE_USER as this sql_mode will be mandatory in the future:
SET SESSION sql_mode = 'NO_AUTO_CREATE_USER';
# Ask for a non-supported action - since strict more is not used, this will give the error: ERROR 1644 (45000): Unknown action: ''
# Note: the action passed to the procedure is actually lost because it's truncated.
--error ER_SIGNAL_EXCEPTION
CALL sys.statement_performance_analyzer('do magic', NULL, NULL);
# Use 5.7.9+ default:
--disable_warnings
SET SESSION sql_mode = 'ONLY_FULL_GROUP_BY,STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION';
--enable_warnings
# Ask for a non-supported action - since strict mode is used, this will give the error: ERROR 1265 (01000): Data truncated for column 'in_action' at row 1
--error 1265
CALL sys.statement_performance_analyzer('do magic', NULL, NULL);
# Try to create reserved table name
-- error S45000
CALL sys.statement_performance_analyzer('create_tmp', 'sys.tmp_digests', NULL);
-- error S45000
CALL sys.statement_performance_analyzer('create_tmp', 'sys.tmp_digests_delta', NULL);
-- error S45000
CALL sys.statement_performance_analyzer('create_tmp', 'tmp_digests', NULL);
# This should succeed
CALL sys.statement_performance_analyzer('create_tmp', 'test.tmp_digests', NULL);
CREATE TABLE test.tmp_unsupported LIKE test.tmp_digests_ini;
# Try to create a temporary table that already exists
-- error S45000
CALL sys.statement_performance_analyzer('create_tmp', 'test.tmp_digests_ini', NULL);
# Try to create a base table that already exists
-- error S45000
CALL sys.statement_performance_analyzer('create_table', 'test.tmp_digests_ini', NULL);
-- error S45000
CALL sys.statement_performance_analyzer('create_table', 'test.tmp_unsupported', NULL);
# Verify that the sanity check for the input table e.g. for saving snapshots works
ALTER TABLE test.tmp_unsupported ADD COLUMN myvar int DEFAULT 0;
-- error S45000
CALL sys.statement_performance_analyzer('save', 'test.tmp_unsupported', NULL);
# Try to create a snapshot or overall output with the wrong in_table
-- error S45000
CALL sys.statement_performance_analyzer('snapshot', 'test.new_table', NULL);
-- error S45000
CALL sys.statement_performance_analyzer('overall', 'test.new_table', 'analysis');
# Try to create a delta output or save a snapshot specifying a non-existing table.
-- error S45000
CALL sys.statement_performance_analyzer('delta', 'test.new_table', 'analysis');
-- error S45000
CALL sys.statement_performance_analyzer('save', 'test.new_table', NULL);
# Verify custom views doesn't work without the user variable set
SET @sys.statement_performance_analyzer.view = NULL;
DELETE FROM sys.sys_config WHERE variable = 'statement_performance_analyzer.view';
-- error S45000
CALL sys.statement_performance_analyzer('overall', NULL, 'custom');
# Set the custom view to a regular table - should not work
SET @sys.statement_performance_analyzer.view = 'test.tmp_unsupported';
-- error S45000
CALL sys.statement_performance_analyzer('overall', NULL, 'custom');
# Remove the temporary tables created by the procedure
# First ensure the tables actually exists (to avoid passing the test if the table names are changed)
CALL sys.table_exists('sys', 'tmp_digests', @exists);
SELECT @exists;
CALL sys.table_exists('sys', 'tmp_digests_delta', @exists);
SELECT @exists;
CALL sys.statement_performance_analyzer('cleanup', NULL, NULL);
# Verify the internal tables really were removed
-- error ER_BAD_TABLE_ERROR
DROP TEMPORARY TABLE sys.tmp_digests;
-- error ER_BAD_TABLE_ERROR
DROP TEMPORARY TABLE sys.tmp_digests_delta;
# An attempt to create a delta view should fail now as there's no longer an existing snapshot.
-- error S45000
CALL sys.statement_performance_analyzer('delta', 'test.tmp_digests_ini', 'analysis');
# Ensure no delta table was created.
-- error ER_BAD_TABLE_ERROR
DROP TEMPORARY TABLE sys.tmp_digests_delta;
# Try and use a table.db name > 129
SET @identifier := REPEAT('a', 65);
-- error 1406
CALL sys.statement_performance_analyzer('snapshot', CONCAT(@identifier, '.', @identifier), NULL);
# Clean up
DROP TEMPORARY TABLE test.tmp_digests_ini;
DROP TEMPORARY TABLE test.tmp_digests;
DROP TABLE test.tmp_unsupported;
DROP TABLE test.t1;
DROP VIEW view_digests;
SET @identifier := NULL;
SET SESSION sql_mode = @@global.sql_mode;
SET @sys.statement_performance_analyzer.limit = NULL;
SET @sys.statement_performance_analyzer.view = NULL;
--source ../include/ps_setup_consumers_cleanup.inc
--source ../include/ps_threads_cleanup.inc
--source ../include/sys_config_cleanup.inc
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