Problem
Performing Instant add column followed by Online DDL on a table causes a crash.
Scenario for Issue Triggering
Performing Instant add column on a table followed by Online DDL operations such as OPTIMIZE TABLE or ALTER TABLE .. ADD PRIMARY KEY may cause a crash due to improper handling of the code (failure to instantly add columns or REDUNDANT format).
Kernel Version Related to the Issue
TXSQL 8.0 versions prior to 3.1.15.001.
Fixed Kernel Version
TXSQL 8.0 3.1.16.003.
Check Method
You can refer to the following command to scan for tables with potential risks.
select replace(name, '/', '.') as 'table_schema.table_name' from information_schema.innodb_tables where TOTAL_ROW_VERSIONS!=0 or INSTANT_COLS!=0;
Fixing Method
2. After the kernel version is upgraded, rebuild and repair corrupted tables using alter table xx engine = innodb;. To avoid business impact caused by table locking, it is recommended to perform repairs during off-peak hours using tools such as pt-osc.