database/mariadb-columnstore-engine
1
0
Fork 0
mirror of https://github.com/mariadb-corporation/mariadb-columnstore-engine.git synced 2025-08-01 06:46:55 +03:00
Code Activity

MCOL-1016 Fix I_S calculations

Browse Source 
* COLUMNSTORE_EXTENTS data_size now shows the total size on the highest
segment of an extent file. It also shows 0 bytes if HWM is zero so that
if there is more than one segment it doesn't show 8192 bytes for the
lower segments.
* COMPRESSION_RATIO was missing some data and using compressed data size
instead of file size (which is probably more realistic).
This commit is contained in:
Andrew Hutchings
2017-11-07 08:28:29 +00:00
parent 28d26c8901
commit 929d0d3fe7
2 changed files with 8 additions and 6 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
dbcon/mysql/columnstore_info.sql
View File

@ -82,9 +82,7 @@ DROP PROCEDURE IF EXISTS `compression_ratio` //
CREATE PROCEDURE compression_ratio()
BEGIN
SELECT CONCAT(((sum(compressed_data_size) / sum(data_size)) * 100), '%') COMPRESSION_RATIO FROM INFORMATION_SCHEMA.COLUMNSTORE_EXTENTS ce
JOIN INFORMATION_SCHEMA.COLUMNSTORE_FILES cf ON ce.object_id = cf.object_id
WHERE compressed_data_size IS NOT NULL;
SELECT CONCAT((SELECT SUM(file_size) FROM information_schema.columnstore_files WHERE compressed_data_size IS NOT NULL) / (SELECT SUM(data_size) FROM information_schema.columnstore_extents) * 100, '%') COMPRESSION_RATIO;
END //
DELIMITER ;