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DocumentationTDSQL-C for MySQLKernel FeaturesInspection and Repair of Kernel IssuesPerforming Instant add column and Online DDL Operations Sequentially on a Table Triggering a crash

Performing Instant add column and Online DDL Operations Sequentially on a Table Triggering a crash

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Last updated: 2025-12-08 15:56:17

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

1. Upgrade the kernel version to TXSQL 8.0 3.1.16.003. For the procedure, see Upgrading the kernel minor version.
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.
Previous Topic: Using Instant Add Column to add beyond the 1024th column causes the system to crashNext Topic: Performing Instant drop Followed by Instant add Column for a Column with the Same Name Causes a crash

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