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--source include/have_debug.inc
SET GLOBAL DEBUG="+d, parallel_read_buffering_print";
--echo #
--echo # Sampling on an empty table
--echo #
SET GLOBAL innodb_monitor_enable = module_sampling;
SELECT NAME,COUNT FROM INFORMATION_SCHEMA.INNODB_METRICS WHERE NAME='sampled_pages_read';
CREATE TABLE t1 (a INT);
ANALYZE TABLE t1 UPDATE HISTOGRAM ON a WITH 50 BUCKETS;
SELECT SCHEMA_NAME, TABLE_NAME, COLUMN_NAME, JSON_REMOVE(histogram, '$."last-updated"') FROM information_schema.column_statistics WHERE COLUMN_NAME = 'a';
DROP TABLE t1;
SELECT NAME,COUNT FROM INFORMATION_SCHEMA.INNODB_METRICS WHERE SUBSYSTEM='sampling';
SET GLOBAL innodb_monitor_disable = module_sampling;
SET GLOBAL innodb_monitor_reset_all = "module_sampling";
--echo #
--echo # Case where only root node is present
--echo #
SET GLOBAL innodb_monitor_enable = module_sampling;
SET DEBUG='+d,histogram_force_sampling';
CREATE TABLE t1 (a INT);
INSERT INTO t1 VALUES (10), (20), (30), (40), (50), (60), (70), (80), (90), (100);
ANALYZE TABLE t1 UPDATE HISTOGRAM ON a WITH 50 BUCKETS;
SELECT SCHEMA_NAME, TABLE_NAME, COLUMN_NAME, JSON_REMOVE(histogram, '$."last-updated"') FROM information_schema.column_statistics WHERE COLUMN_NAME = 'a';
DROP TABLE t1;
SELECT NAME,COUNT FROM INFORMATION_SCHEMA.INNODB_METRICS WHERE SUBSYSTEM='sampling';
SET GLOBAL innodb_monitor_disable = "module_sampling";
SET GLOBAL innodb_monitor_reset_all = "module_sampling";
SET DEBUG='-d,histogram_force_sampling';
--echo #
--echo # Case where only two levels is present with sampling_percentage = 50
--echo #
SET GLOBAL innodb_monitor_enable = module_sampling;
SET DEBUG='+d,histogram_force_sampling';
# Restrict the number of records in a page to 2
set global innodb_limit_optimistic_insert_debug = 2;
CREATE TABLE t1 (a INT);
INSERT INTO t1 VALUES (10), (20), (30);
ANALYZE TABLE t1 UPDATE HISTOGRAM ON a WITH 50 BUCKETS;
SELECT SCHEMA_NAME, TABLE_NAME, COLUMN_NAME, JSON_REMOVE(histogram, '$."last-updated"') FROM information_schema.column_statistics WHERE COLUMN_NAME = 'a';
DROP TABLE t1;
SELECT NAME,COUNT FROM INFORMATION_SCHEMA.INNODB_METRICS WHERE SUBSYSTEM='sampling';
SET GLOBAL innodb_monitor_disable = module_sampling;
SET GLOBAL innodb_monitor_reset_all = "module_sampling";
set global innodb_limit_optimistic_insert_debug = 0;
SET DEBUG='-d,histogram_force_sampling';
--echo #
--echo # Case where only two levels is present with sampling_percentage = 100
--echo #
SET GLOBAL innodb_monitor_enable = module_sampling;
# Restrict the number of records in a page to 2
set global innodb_limit_optimistic_insert_debug = 2;
CREATE TABLE t1 (a INT);
INSERT INTO t1 VALUES (10), (20), (30);
ANALYZE TABLE t1 UPDATE HISTOGRAM ON a WITH 50 BUCKETS;
SELECT SCHEMA_NAME, TABLE_NAME, COLUMN_NAME, JSON_REMOVE(histogram, '$."last-updated"') FROM information_schema.column_statistics WHERE COLUMN_NAME = 'a';
DROP TABLE t1;
SELECT NAME,COUNT FROM INFORMATION_SCHEMA.INNODB_METRICS WHERE SUBSYSTEM='sampling';
SET GLOBAL innodb_monitor_disable = module_sampling;
SET GLOBAL innodb_monitor_reset_all = "module_sampling";
set global innodb_limit_optimistic_insert_debug = 0;
--echo #
--echo # Normal case with small dataset
--echo #
SET GLOBAL innodb_monitor_enable = module_sampling;
# Restrict the number of records in a page to 2
set global innodb_limit_optimistic_insert_debug = 2;
CREATE TABLE t1 (a INT);
INSERT INTO t1 VALUES (10), (20), (30), (40), (50);
ANALYZE TABLE t1 UPDATE HISTOGRAM ON a WITH 50 BUCKETS;
SELECT SCHEMA_NAME, TABLE_NAME, COLUMN_NAME, JSON_REMOVE(histogram, '$."last-updated"') FROM information_schema.column_statistics WHERE COLUMN_NAME = 'a';
set global innodb_limit_optimistic_insert_debug = 0;
DROP TABLE t1;
SELECT NAME,COUNT FROM INFORMATION_SCHEMA.INNODB_METRICS WHERE SUBSYSTEM='sampling';
SET GLOBAL innodb_monitor_disable = module_sampling;
SET GLOBAL innodb_monitor_reset_all = "module_sampling";
--echo #
--echo # Check that histogram with sampling works as expected with large dataset
--echo #
SET GLOBAL innodb_monitor_enable = module_sampling;
# Restrict the number of records in a page to 2
set global innodb_limit_optimistic_insert_debug = 2;
CREATE TABLE t1 (col1 DOUBLE);
INSERT INTO t1 SELECT RAND(1);
INSERT INTO t1 SELECT RAND(2) FROM t1;
INSERT INTO t1 SELECT RAND(3) FROM t1;
INSERT INTO t1 SELECT RAND(4) FROM t1;
INSERT INTO t1 SELECT RAND(5) FROM t1;
INSERT INTO t1 SELECT RAND(6) FROM t1;
INSERT INTO t1 SELECT RAND(7) FROM t1;
INSERT INTO t1 SELECT RAND(8) FROM t1;
INSERT INTO t1 SELECT RAND(9) FROM t1;
INSERT INTO t1 SELECT RAND(10) FROM t1;
ANALYZE TABLE t1 UPDATE HISTOGRAM ON col1 WITH 5 BUCKETS;
SELECT SCHEMA_NAME, TABLE_NAME, COLUMN_NAME, JSON_REMOVE(histogram, '$."last-updated"') FROM information_schema.column_statistics WHERE COLUMN_NAME = 'col1';
SELECT NAME,COUNT FROM INFORMATION_SCHEMA.INNODB_METRICS WHERE SUBSYSTEM='sampling';
SET GLOBAL innodb_monitor_disable = module_sampling;
SET GLOBAL innodb_monitor_reset_all = "module_sampling";
--echo #
--echo # Check that histogram with sampling works as expected with large dataset and different sampling percentage
--echo #
SET GLOBAL innodb_monitor_enable = module_sampling;
SET DEBUG='+d,histogram_force_sampling';
ANALYZE TABLE t1 UPDATE HISTOGRAM ON col1 WITH 50 BUCKETS;
SELECT SCHEMA_NAME, TABLE_NAME, COLUMN_NAME, JSON_REMOVE(histogram, '$."last-updated"') FROM information_schema.column_statistics WHERE COLUMN_NAME = 'col1';
DROP TABLE t1;
set global innodb_limit_optimistic_insert_debug = 0;
SELECT NAME,COUNT FROM INFORMATION_SCHEMA.INNODB_METRICS WHERE SUBSYSTEM='sampling';
SET GLOBAL innodb_monitor_disable = module_sampling;
SET GLOBAL innodb_monitor_reset_all = "module_sampling";
SET DEBUG='-d,histogram_force_sampling';
--echo #
--echo # Normal case with small dataset with different sampling_percentage
--echo #
SET GLOBAL innodb_monitor_enable = module_sampling;
SET DEBUG='+d,histogram_force_sampling';
# Restrict the number of records in a page to 2
set global innodb_limit_optimistic_insert_debug = 2;
CREATE TABLE t1 (a INT);
INSERT INTO t1 VALUES (10), (20), (30), (40), (50), (60), (70), (80), (90), (100);
ANALYZE TABLE t1 UPDATE HISTOGRAM ON a WITH 50 BUCKETS;
SELECT SCHEMA_NAME, TABLE_NAME, COLUMN_NAME, JSON_REMOVE(histogram, '$."last-updated"') FROM information_schema.column_statistics WHERE COLUMN_NAME = 'a';
SELECT NAME,COUNT FROM INFORMATION_SCHEMA.INNODB_METRICS WHERE SUBSYSTEM='sampling';
SET GLOBAL innodb_monitor_disable = module_sampling;
SET GLOBAL innodb_monitor_reset_all = "module_sampling";
--echo #
--echo # Case to check if same rows are returned for the same seed
--echo #
SET GLOBAL innodb_monitor_enable = module_sampling;
ANALYZE TABLE t1 UPDATE HISTOGRAM ON a WITH 50 BUCKETS;
SELECT SCHEMA_NAME, TABLE_NAME, COLUMN_NAME, JSON_REMOVE(histogram, '$."last-updated"') FROM information_schema.column_statistics WHERE COLUMN_NAME = 'a';
DROP TABLE t1;
set global innodb_limit_optimistic_insert_debug = 0;
SET DEBUG='-d,histogram_force_sampling';
SELECT NAME,COUNT FROM INFORMATION_SCHEMA.INNODB_METRICS WHERE SUBSYSTEM='sampling';
SET GLOBAL innodb_monitor_disable = module_sampling;
SET GLOBAL innodb_monitor_reset_all = "module_sampling";
--echo #
--echo # Case were there is an error while buffering
--echo #
SET GLOBAL innodb_monitor_enable = module_sampling;
SET DEBUG='+d,histogram_force_sampling';
SET GLOBAL DEBUG='+d,parallel_reader_histogram_induce_error';
# Restrict the number of records in a page to 2
set global innodb_limit_optimistic_insert_debug = 2;
CREATE TABLE t1 (a INT);
INSERT INTO t1 VALUES (10), (20), (30), (40), (50), (60), (70), (80), (90), (100);
ANALYZE TABLE t1 UPDATE HISTOGRAM ON a WITH 50 BUCKETS;
SELECT SCHEMA_NAME, TABLE_NAME, COLUMN_NAME, JSON_REMOVE(histogram, '$."last-updated"') FROM information_schema.column_statistics WHERE COLUMN_NAME = 'a';
DROP TABLE t1;
set global innodb_limit_optimistic_insert_debug = 0;
SET GLOBAL DEBUG='-d,parallel_reader_histogram_induce_error';
SET DEBUG='-d,histogram_force_sampling';
SELECT NAME,COUNT FROM INFORMATION_SCHEMA.INNODB_METRICS WHERE SUBSYSTEM='sampling';
SET GLOBAL innodb_monitor_disable = module_sampling;
SET GLOBAL innodb_monitor_reset_all = "module_sampling";
--echo #
--echo # Case were partitions are involved
--echo #
SET GLOBAL innodb_monitor_enable = module_sampling;
CREATE TABLE p (col1 INT PRIMARY KEY, col2 INT, col3 INT)
PARTITION BY KEY (col1) PARTITIONS 4;
INSERT INTO p VALUES (1, 1, 1), (2, 2, 2), (3, 3, 3);
ANALYZE TABLE p UPDATE HISTOGRAM ON col2 WITH 50 BUCKETS;
SELECT SCHEMA_NAME, TABLE_NAME, COLUMN_NAME, JSON_REMOVE(histogram, '$."last-updated"') FROM information_schema.column_statistics WHERE COLUMN_NAME = 'col2';
DROP TABLE p;
SELECT NAME,COUNT FROM INFORMATION_SCHEMA.INNODB_METRICS WHERE SUBSYSTEM='sampling';
SET GLOBAL innodb_monitor_disable = module_sampling;
SET GLOBAL innodb_monitor_reset_all = "module_sampling";
--echo #
--echo # Case were there is an error while buffering when partitions are involved
--echo #
SET GLOBAL innodb_monitor_enable = module_sampling;
SET DEBUG='+d,histogram_force_sampling';
SET GLOBAL DEBUG='+d,parallel_reader_histogram_induce_error';
# Restrict the number of records in a page to 2
set global innodb_limit_optimistic_insert_debug = 2;
CREATE TABLE p (col1 INT PRIMARY KEY, col2 INT, col3 INT)
PARTITION BY KEY (col1) PARTITIONS 4;
INSERT INTO p VALUES (1, 1, 1), (2, 2, 2), (3, 3, 3);
ANALYZE TABLE p UPDATE HISTOGRAM ON col2 WITH 50 BUCKETS;
SELECT SCHEMA_NAME, TABLE_NAME, COLUMN_NAME, JSON_REMOVE(histogram, '$."last-updated"') FROM information_schema.column_statistics WHERE COLUMN_NAME = 'col2';
SELECT NAME,COUNT FROM INFORMATION_SCHEMA.INNODB_METRICS WHERE SUBSYSTEM='sampling';
DROP TABLE p;
set global innodb_limit_optimistic_insert_debug = 0;
SET GLOBAL DEBUG='-d,parallel_reader_histogram_induce_error';
SET DEBUG='-d,histogram_force_sampling';
SET GLOBAL innodb_monitor_disable = module_sampling;
SET GLOBAL innodb_monitor_reset_all = "module_sampling";
--echo #
--echo # RAPID use case : Break from sampling after sampling half the records
--echo #
CREATE TABLE t1 (id int);
INSERT INTO t1 VALUES (1), (2), (3), (4), (5), (6), (7), (8), (9), (10);
SET DEBUG = "+d,sample_read_sample_half";
ANALYZE TABLE t1 UPDATE HISTOGRAM ON id WITH 50 BUCKETS;
SELECT SCHEMA_NAME, TABLE_NAME, COLUMN_NAME, JSON_REMOVE(histogram, '$."last-updated"') FROM information_schema.column_statistics WHERE COLUMN_NAME = 'id';
SET DEBUG = "-d, sample_read_sample_half";
DROP TABLE t1;
--echo #
--echo # Error case where the table is discared
--echo #
CREATE TABLE t1 (id int);
# Discard tablespace to force histogram failure.
ALTER TABLE t1 DISCARD TABLESPACE;
ANALYZE TABLE t1 UPDATE HISTOGRAM ON id WITH 50 BUCKETS;
DROP TABLE t1;
--echo #
--echo # Simulated error case where parallel read thread returns error
--echo #
CREATE TABLE t1 (id int);
INSERT INTO t1 VALUES (1), (2), (3), (4), (5), (6), (7), (8), (9), (10);
SET GLOBAL DEBUG = "+d,simulate_sample_read_error";
ANALYZE TABLE t1 UPDATE HISTOGRAM ON id WITH 50 BUCKETS;
SELECT SCHEMA_NAME, TABLE_NAME, COLUMN_NAME, JSON_REMOVE(histogram, '$."last-updated"') FROM information_schema.column_statistics WHERE COLUMN_NAME = 'id';
SET GLOBAL DEBUG = "-d,simulate_sample_read_error";
DROP TABLE t1;
--echo #
--echo # Cleanup
--echo #
SET GLOBAL innodb_monitor_enable = default;
SET GLOBAL innodb_monitor_disable = default;
SET GLOBAL innodb_monitor_reset_all = default;
SET GLOBAL DEBUG="-d, parallel_read_buffering_print";
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