Abstract: The present invention discloses a straight-line sewage treatment system for enhanced treatment of low-carbon-to-nitrogen ratio (C/N) domestic sewage, including a sewage intake tank, an enhanced denitrification tank through a pipeline, an effluent outlet of the enhanced denitrification tank, an effluent pipe, a first storage tank, a second storage tank, and a disinfection tank.

Abstract: Provided are a database processing method and apparatus, and a computer readable storage medium. The database processing method comprises: after a lock wait is generated, writing lock wait related information into a lock wait log.

Abstract: Disclosed in embodiments of the present disclosure are methods and apparatuses for realizing a globally unique index, which are applicable to a distributed database. One of the methods includes: receiving a structured query language, SQL, request, obtaining a conflict detection SQL statement corresponding to the SQL request and calculating an expected value; issuing the conflict detection SQL statement to each database node for execution; obtaining an execution result of the conflict detection SQL statement, and comparing the execution result of the conflict detection SQL statement with the expected value; and when the execution result of the conflict detection SQL statement is less than or equal to the expected value, processing an original SQL statement of the SQL request, and issuing the original SQL statement to the each database node for execution.

Abstract: A service request message sending method, a distributed database architecture and a computer readable storage medium are disclosed. The method includes: receiving (S101) a service request message, and sending (S102) the service request message to a corresponding storage unit through N tiers of computing nodes, where N is an integer greater than or equal to 2, and the closer the tier is to the storage unit, the larger the number of computing nodes in that tier is.

Abstract: A service request message sending method, a distributed database architecture and a computer readable storage medium are disclosed. The method includes: receiving (S101) a service request message, and sending (S102) the service request message to a corresponding storage unit through N tiers of computing nodes, where N is an integer greater than or equal to 2, and the closer the tier is to the storage unit, the larger the number of computing nodes in that tier is.

Abstract: Disclosed in embodiments of the present disclosure are methods and apparatuses for realizing a globally unique index, which are applicable to a distributed database. One of the methods includes: receiving a structured query language, SQL, request, obtaining a conflict detection SQL statement corresponding to the SQL request and calculating an expected value; issuing the conflict detection SQL statement to each database node for execution; obtaining an execution result of the conflict detection SQL statement, and comparing the execution result of the conflict detection SQL statement with the expected value; and when the execution result of the conflict detection SQL statement is less than or equal to the expected value, processing an original SQL statement of the SQL request, and issuing the original SQL statement to the each database node for execution.

Abstract: Provided are a database processing method and apparatus, and a computer readable storage medium. The database processing method comprises: after a lock wait is generated, writing lock wait related information into a lock wait log.

Abstract: The present invention discloses a system and a method for state management based on an instant messaging platform. The system comprises a client, a registration application server, a PS application server, and at least one third party server. The method includes the third party server searching its database according to client login information, obtaining the group information of the client and member information of the group, and returning the group information and the member information of the group to the client; then the client sending its current state and group information to the PS application server; and the PS application server, after receiving the current state and group information, sending states of other on-line members in the group to the client, and forwarding the current state of the client to other on-line members in the group.