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MySQL/TDSQL for MySQL/TDSQL-C check details

• Check requirements: The innodb_stats_on_metadata environment variable in the source database must be set to OFF.
• • Check description:
    • If the innodb_stats_on_metadata parameter is enabled, every time tables in the information_schema metadatabase are queried, InnoDB will update the information_schema.statistics table, causing slower access. After this parameter is disabled, access to the schema table can be faster.
    • On MySQL versions earlier than 5.6.6, the default value of the innodb_stats_on_metadata parameter is ON, and you need to change it to OFF. On MySQL 5.6.6 or later, the default value is OFF, which has no problem.

TDSQL for PostgreSQL check details

The wal_level of the DN node must be logical.

Troubleshooting

1. Log in to the source database.

2. Change the value of innodb_stats_on_metadata to OFF.

   set global innodb_stats_on_metadata = OFF;
   

3. Check whether the configuration takes effect.

   show global variables like '%innodb_stats_on_metadata%';
   

The system should display a result similar to the following:

mysql> show global variables like '%innodb_stats_on_metadata%';
+--------------------------+-------+
| Variable_name            | Value |
+--------------------------+-------+
| innodb_stats_on_metadata | OFF   |
+--------------------------+-------+
1 row in set (0.00 sec)

4. Run the verification task again.