database/mariadb
1
0
Fork 0
mirror of https://github.com/MariaDB/server.git synced 2025-08-01 03:47:19 +03:00
Code Activity

MDEV-26519: Improved histograms

Browse Source 
Save extra information in the histogram:

    "target_histogram_size": nnn,
    "collected_at": "(date and time)",
    "collected_by": "(server version)",
This commit is contained in:
Sergei Petrunia
2021-12-03 18:08:10 +03:00
parent a0916cf5a2
commit c2d2c1e727
8 changed files with 579 additions and 54 deletions
Download Patch File Download Diff File Expand all files Collapse all files

22
mysql-test/main/statistics.test
View File

@ -91,6 +91,7 @@ SELECT * FROM mysql.index_stats;
SELECT COUNT(*) FROM t1;
SELECT * FROM mysql.column_stats
WHERE db_name='test' AND table_name='t1' AND column_name='a';
SELECT MIN(t1.a), MAX(t1.a),
@ -187,6 +188,7 @@ DELETE FROM mysql.column_stats;
set histogram_size=4;
ANALYZE TABLE t1;
--source include/histogram_replaces.inc
SELECT db_name, table_name, column_name,
min_value, max_value,
nulls_ratio, avg_frequency,
@ -200,6 +202,7 @@ set histogram_size=8;
set histogram_type=@DOUBLE_PREC_TYPE;
ANALYZE TABLE t1;
--source include/histogram_replaces.inc
SELECT db_name, table_name, column_name,
min_value, max_value,
nulls_ratio, avg_frequency,
@ -668,8 +671,10 @@ ANALYZE TABLE City;
FLUSH TABLES;
--enable_result_log
--query_vertical select UPPER(db_name),UPPER(table_name),UPPER(column_name),min_value,max_value,nulls_ratio,avg_length,avg_frequency,hist_size,hist_type,hex(histogram),decode_histogram(hist_type,histogram) from mysql.column_stats where UPPER(db_name)='WORLD' and UPPER(table_name)='COUNTRYLANGUAGE' and UPPER(column_name) = 'PERCENTAGE';
--query_vertical select UPPER(db_name),UPPER(table_name),UPPER(column_name),min_value,max_value,nulls_ratio,avg_length,avg_frequency,hist_size,hist_type,hex(histogram),decode_histogram(hist_type,histogram) from mysql.column_stats where UPPER(db_name)='WORLD' and UPPER(table_name)='CITY' and UPPER(column_name) = 'POPULATION';
--source include/histogram_replaces.inc
--query_vertical select UPPER(db_name),UPPER(table_name),UPPER(column_name),min_value,max_value,nulls_ratio,avg_length,avg_frequency,hist_size,hist_type,decode_histogram(hist_type,histogram) from mysql.column_stats where UPPER(db_name)='WORLD' and UPPER(table_name)='COUNTRYLANGUAGE' and UPPER(column_name) = 'PERCENTAGE';
--source include/histogram_replaces.inc
--query_vertical select UPPER(db_name),UPPER(table_name),UPPER(column_name),min_value,max_value,nulls_ratio,avg_length,avg_frequency,hist_size,hist_type,decode_histogram(hist_type,histogram) from mysql.column_stats where UPPER(db_name)='WORLD' and UPPER(table_name)='CITY' and UPPER(column_name) = 'POPULATION';
set histogram_type=@SINGLE_PREC_TYPE;
set histogram_size=0;
@ -715,6 +720,7 @@ set histogram_size=10;
analyze table t1 persistent for all;
--source include/histogram_replaces.inc
select db_name, table_name, column_name,
min_value, max_value,
nulls_ratio, avg_frequency,
@ -741,6 +747,7 @@ show variables like 'histogram%';
analyze table t1 persistent for all;
--source include/histogram_replaces.inc
select db_name, table_name, column_name,
min_value, max_value,
nulls_ratio, avg_frequency,
@ -786,10 +793,11 @@ set histogram_size=63;
analyze table t2 persistent for all;
--source include/histogram_replaces.inc
select db_name, table_name, column_name,
min_value, max_value,
nulls_ratio, avg_frequency,
hist_size, hist_type, HEX(histogram)
hist_size, hist_type, decode_histogram(hist_type,histogram)
FROM mysql.column_stats;
set histogram_size=0;
@ -807,10 +815,11 @@ insert into t1 values(unhex('D879626AF872675F73E662F8'));
analyze table t1 persistent for all;
show warnings;
--source include/histogram_replaces.inc
select db_name, table_name, column_name,
HEX(min_value), HEX(max_value),
nulls_ratio, avg_frequency,
hist_size, hist_type, HEX(histogram)
hist_size, hist_type, decode_histogram(hist_type,histogram)
FROM mysql.column_stats;
drop table t1;
@ -974,6 +983,7 @@ INSERT INTO t1 SELECT id+9192 FROM t1;
--echo # This query will should show a full table scan analysis.
--echo #
ANALYZE TABLE t1;
--source include/histogram_replaces.inc
select table_name, column_name, min_value, max_value, nulls_ratio, avg_length, avg_frequency,
DECODE_HISTOGRAM(hist_type, histogram)
from mysql.column_stats;
@ -984,6 +994,7 @@ set analyze_sample_percentage=0.1;
--echo # This query will show an innacurate avg_frequency value.
--echo #
ANALYZE TABLE t1;
--source include/histogram_replaces.inc
select table_name, column_name, min_value, max_value, nulls_ratio, avg_length, avg_frequency,
DECODE_HISTOGRAM(hist_type, histogram)
from mysql.column_stats;
@ -993,6 +1004,7 @@ from mysql.column_stats;
--echo #
set analyze_sample_percentage=25;
ANALYZE TABLE t1;
--source include/histogram_replaces.inc
select table_name, column_name, min_value, max_value, nulls_ratio, avg_length, avg_frequency,
DECODE_HISTOGRAM(hist_type, histogram)
from mysql.column_stats;
@ -1003,6 +1015,7 @@ set analyze_sample_percentage=0;
--echo # Test self adjusting sampling level.
--echo #
ANALYZE TABLE t1;
--source include/histogram_replaces.inc
select table_name, column_name, min_value, max_value, nulls_ratio, avg_length, avg_frequency,
DECODE_HISTOGRAM(hist_type, histogram)
from mysql.column_stats;
@ -1014,6 +1027,7 @@ explain select * from t1;
set analyze_sample_percentage=100;
ANALYZE TABLE t1;
--source include/histogram_replaces.inc
select table_name, column_name, min_value, max_value, nulls_ratio, avg_length, avg_frequency,
DECODE_HISTOGRAM(hist_type, histogram)
from mysql.column_stats;