Information processing apparatus and information processing system

An information processing system comprising:

• a first computer that includes a first processor, the first computer being configured to send a request message including information on at least one target column among columns of a table stored in a relational database and a third code, the request message requesting a data read or write operation on the table;
• and
• a second computer that includes a second processor, the second computer being configured to hold a first code generated from first data structure information and to receive the request message, the first data structure information indicating the columns,
• wherein the second computer adds a second code generated from second data structure information indicating the columns after update without deleting the first code when the update satisfies a prescribed condition, compares the first second code with the third code, permits the requested data read or write operation by skipping an exception process upon determining that the second code and the third code are identical, compares the first code with the third code upon determining that the second code and the third code are different, permits the requested data read or write operation by skipping the exception process upon determining that the first code and the third code are identical, and performs the exception process upon determining that the first code and the third code are different, the exception process including checking for consistency between the second data structure information and the information on the at least one target column.

A non-transitory computer-readable recording medium storing a computer program causing a computer to perform a process comprising:

• adding a second code generated from second data structure information without deleting a first code generated from first data structure information, the first data structure information indicating columns of a table stored in a relational database, the second data structure information indicating the columns after update, the adding being performed when the update satisfies a prescribed condition;
• obtaining a request message including information on at least one target column of the table and a third code, the request message requesting a data read or write operation on the table;
• comparing the second code with the third code;
• and
• permitting the requested data read or write operation bar skipping an exception process upon determining that the second code and the third code are identical;
• comparing the first code with the third code upon determining that the second code and the third code are different;
• permitting the requested data read or write operation by skipping the exception process upon determining that the first code and the third code are identical;
• and
• performing the exception process upon determining that the first code and the third code are different, the exception process including checking for consistency between the second data structure information and the information on the at least one target column.