Mirage instance of a database server

One or more non-transitory computer-readable storage media comprising a plurality of instructions to one or more processors to manage a database management system in one or more computers, the plurality of instructions comprising:

• instructions to receive one or more requests to perform database operations in a specific session that originates from a specific client application outside the one or more computers, wherein the one or more requests comprises a first request that is determined to be a normal request and a second request that is determined to be an abnormal request;
• instructions to handle the one or more requests at least partially, in one or more instances of a database server of a first kind in the database management system or in one or more instances of a database server of a second kind in the database management system, wherein during the same time, the first request that is determined to be the normal request is handled by the one or more instances of the database server of the first kind, and the second request that is determined to be the abnormal request is handled by the one or more instances of the database server of the second kind by automatically relocate handling, for the second request that is determined to be the abnormal request, from a first instance among the one or more instances of the database server of the first kind to a second instance among the one or more instances of the database server of the second kind, such that the one or more instances of the database server of the first kind are simultaneously operating with the one or more instances of the database server of the second kind, and both the first request and the second request are both simultaneously being executed respectively by the instances of the database servers of the first and second kinds;
• and
• instructions to transmit to the specific client application, in the specific session, at least a result of the handling.

An apparatus comprising one or more computer memories coupled to one or more processors in one or more computers, the one or more processors being configured to execute instructions in the one or more computer memories to manage a database management system in the one or more computers, the instructions causing the one or more computers to:

• receive one or more requests to perform database operations in a specific session that originates from a specific client application outside the one or more computers, wherein the one or more requests comprises a first request that is determined to be a normal request and a second request that is determined to be an abnormal request;
• handle the one or more requests at least partially, in one or more instances of a database server of a first kind in the database management system or in one or more instances of a database server of a second kind in the database management system, wherein during the same time, the first request that is determined to be the normal request is handled by the one or more instances of the database server of the first kind, and the second request that is determined to be the abnormal request is handled by the one or more instances of the database server of the second kind by automatically relocate handling, for the second request that is determined to be the abnormal request, from a first instance among the one or more instances of the database server of the first kind to a second instance among the one or more instances of the database server of the second kind, such that the one or more instances of the database server of the first kind are simultaneously operating with the one or more instances of the database server of the second kind, and both the first request and the second request are both simultaneously being executed respectively by the instances of the database servers of the first and second kinds;
• and
• transmitting to the specific client application, in the specific session, at least a result of the handling.