database/mariadb-columnstore-engine
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MCOL-406 Improved Information Schema

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* Add INFORMATION_SCHEMA.COLUMNSTORE_FILES which contains information
  about files
* Remove file information from COLUMNSTORE_EXTENTS (due to above)
* Hide columns with Object ID < 3000 (internal columns)
* Fix bad calculation in data_size columns
* Fix minor memory leak
* Add compressedSize() function to IDBFileSystem to get the used file
  size for a compressed file
* Add columnstore_info schema with utility stored procedures to access
  the information_schema tables
This commit is contained in:
Andrew Hutchings
2016-11-23 22:11:26 +00:00
parent 606284ad63
commit 3b1de94cd8
13 changed files with 422 additions and 28 deletions
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50
dbcon/mysql/columnstore_info.sql Normal file
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CREATE DATABASE columnstore_info;
USE columnstore_info;
DELIMITER //
CREATE FUNCTION `format_filesize`(filesize FLOAT) RETURNS varchar(20) CHARSET utf8 DETERMINISTIC
BEGIN
DECLARE n INT DEFAULT 1;
LOOP
IF filesize < 1024 THEN
RETURN concat(round(filesize, 2), ' ', elt(n, 'Bytes', 'KB', 'MB', 'GB', 'TB', 'PB', 'EB', 'ZB', 'YB', 'BB'));
END IF;
SET filesize = filesize / 1024;
SET n = n + 1;
END LOOP;
END //
CREATE PROCEDURE total_usage ()
BEGIN
SELECT
(SELECT format_filesize(sum(data_size)) TOTAL_DATA_SIZE FROM INFORMATION_SCHEMA.COLUMNSTORE_EXTENTS) TOTAL_DATA_SIZE,
(SELECT format_filesize(sum(file_size)) TOTAL_DISK_USAGE FROM INFORMATION_SCHEMA.COLUMNSTORE_FILES) TOTAL_DISK_USAGE;
END //
CREATE PROCEDURE table_usage (IN t_name char(64))
BEGIN
IF t_name IS NOT NULL THEN
SELECT TABLE_NAME, format_filesize(sum(cf.file_size)) DATA_DISK_USAGE, format_filesize(sum(IFNULL(ccf.file_size, 0))) DICT_DISK_USAGE, format_filesize(sum(cf.file_size) + sum(IFNULL(ccf.file_size, 0))) TOTAL_USAGE FROM INFORMATION_SCHEMA.COLUMNSTORE_COLUMNS cc
JOIN INFORMATION_SCHEMA.COLUMNSTORE_FILES cf ON cc.object_id = cf.object_id
LEFT JOIN INFORMATION_SCHEMA.COLUMNSTORE_FILES ccf ON cc.dictionary_object_id = ccf.object_id
WHERE table_name = t_name GROUP BY table_name;
ELSE
SELECT TABLE_NAME, format_filesize(sum(cf.file_size)) DATA_DISK_USAGE, format_filesize(sum(IFNULL(ccf.file_size, 0))) DICT_DISK_USAGE, format_filesize(sum(cf.file_size) + sum(IFNULL(ccf.file_size, 0))) TOTAL_USAGE FROM INFORMATION_SCHEMA.COLUMNSTORE_COLUMNS cc
JOIN INFORMATION_SCHEMA.COLUMNSTORE_FILES cf ON cc.object_id = cf.object_id
LEFT JOIN INFORMATION_SCHEMA.COLUMNSTORE_FILES ccf ON cc.dictionary_object_id = ccf.object_id
GROUP BY table_name;
END IF;
END //
CREATE PROCEDURE compression_ratio()
BEGIN
SELECT CONCAT(((1 - (sum(data_size) / sum(compressed_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;
END //
DELIMITER ;