database/mariadb-columnstore-engine
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MCOL-533 Add lock to table_usage

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Calling from multiple connections simultaneously is bad. This adds a
lock preventing that.
This commit is contained in:
Andrew Hutchings
2017-01-25 19:34:46 +00:00
committed by David Hall
parent 4b2b83acd9
commit 106a62222c
1 changed files with 10 additions and 1 deletions
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11
dbcon/mysql/columnstore_info.sql
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@@ -35,7 +35,15 @@ END //
DROP PROCEDURE IF EXISTS `table_usage` // DROP PROCEDURE IF EXISTS `table_usage` //
CREATE PROCEDURE table_usage (IN t_schema char(64), IN t_name char(64)) CREATE PROCEDURE table_usage (IN t_schema char(64), IN t_name char(64))
BEGIN `table_usage`: BEGIN
DECLARE `locker` TINYINT UNSIGNED DEFAULT IS_USED_LOCK('table_usage');
IF `locker` IS NOT NULL THEN
SIGNAL SQLSTATE '45000' SET MESSAGE_TEXT = 'Error acuqiring table_usage lock';
LEAVE `table_usage`;
END IF;
DO GET_LOCK('table_usage', 0);
DROP TABLE IF EXISTS columnstore_info.columnstore_columns; DROP TABLE IF EXISTS columnstore_info.columnstore_columns;
DROP TABLE IF EXISTS columnstore_info.columnstore_files; DROP TABLE IF EXISTS columnstore_info.columnstore_files;
CREATE TABLE columnstore_info.columnstore_columns engine=myisam as (select * from information_schema.columnstore_columns); CREATE TABLE columnstore_info.columnstore_columns engine=myisam as (select * from information_schema.columnstore_columns);
@@ -67,6 +75,7 @@ group by table_schema, table_name
END IF; END IF;
DROP TABLE IF EXISTS columnstore_info.columnstore_columns; DROP TABLE IF EXISTS columnstore_info.columnstore_columns;
DROP TABLE IF EXISTS columnstore_info.columnstore_files; DROP TABLE IF EXISTS columnstore_info.columnstore_files;
DO RELEASE_LOCK('table_usage');
END // END //
DROP PROCEDURE IF EXISTS `compression_ratio` // DROP PROCEDURE IF EXISTS `compression_ratio` //