Abstract: An elevator system and a support column assembly. The elevator system includes a support column, with the bottom end thereof connected to a bottom mounting base, and the top end thereof connected to a top mounting base; a counterweight arranged in the support column; a car having a through hole penetrating in a vertical direction, wherein the car is arranged around the support column via the through hole; and a traction assembly, wherein the car is connected to the counterweight via the traction assembly, and the car and the counterweight reciprocate along the length direction of the support column under the traction of the traction assembly.

Abstract: In a database replication operation, a source end device obtains at least two groups of transaction logs from a log file of a source end database in parallel, where the at least two groups of transaction logs include a first group of transaction logs and a second group of transaction logs. The first group of transaction logs includes at least a first transaction log and a second transaction log that are adjacent to each other, and the second group of transaction logs includes at least a third transaction log and a fourth transaction log that are adjacent to each other, and a generation time point of the second transaction log is earlier than a generation time point of the third transaction log. The source end device then sends the at least two groups of transaction logs to a destination end device.

Abstract: An elevator system and a support column assembly. The elevator system includes a support column, with the bottom end thereof connected to a bottom mounting base, and the top end thereof connected to a top mounting base; a counterweight arranged in the support column; a car having a through hole penetrating in a vertical direction, wherein the car is arranged around the support column via the through hole; and a traction assembly, wherein the car is connected to the counterweight via the traction assembly, and the car and the counterweight reciprocate along the length direction of the support column under the traction of the traction assembly.

Abstract: The present invention provides an elevator guide rail cleaning apparatus and a cleaning method using the same, which belongs to the technical field of elevators. The elevator guide rail cleaning apparatus according to the present invention includes: a base, a scraping component installed opposite to an operating surface of an elevator guide rail, and a wiping component installed opposite to the operating surface of the elevator guide rail, wherein the elevator guide rail cleaning apparatus is detachably installed on a guide apparatus of an elevator system. The elevator guide rail cleaning apparatus according to the present invention can effectively remove foreign matters such as anti-rust coatings on an elevator guide rail, which has high cleaning efficiency, good cleaning effects, high automatic cleaning degree and low labor intensity.

Abstract: A limiting mechanism for an elevator compensation rope tensioning pulley, an elevator compensation apparatus including the limiting mechanism for an elevator compensation rope tensioning pulley, and an elevator system.