Problem
The Instant add column operation causes page data occupancy to exceed 50%, resulting in rollback failure when an upgrade to a higher version is performed.
Issue Triggering Scenario
In versions of TXSQL 8.0 prior to 3.1.15.002, Instant add column operations were permitted even when row sizes exceeded half the page size. After the kernel version is upgraded, rollback operations may fail due to row size exceeding limitations during rollback events.
Kernel Version Related to the Issue
TXSQL 8.0 versions prior to 3.1.15.002.
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.