Abstract: Technologies are described providing adaptive query routing in a replicated database environment. The technologies can be used with a variety of replication protocols. Prepared statements, such as for queries, from a database client can be routed to a source node, or a source node and available replica nodes, when a replica node becomes unavailable. When a replica node becomes available again, a prepared statement can be updated to indicate that the updated prepared statement can be executed at nodes including the replica node that is available again. Prepared statement routing can also be used when a portion of replicated data becomes unavailable at a replica node, but a portion of replicated data remains available.

Abstract: Provided is a toy building block which uses magnets, and which is a combination building block toy and teaching instrument with embedded magnets, wherein on each of the four edges of an upper frame (2) and lower frame (3), an inward-facing insertion aperture (6) is formed to connect internally to a central hollow portion (7), a magnetic ball (8) is inserted in the respective central hollow portions (7), and a projecting protrusion on the top and bottom of four pillars are inserted in the respective insertion apertures; and inward-facing projecting protrusions (21, 22, 23, 24), (25, 26, 27, 28) on an upper frame (20), lower frame (30), and pillars (40, 41, 42, 43), are respectively inserted in insertion grooves (23?, 24?, 27?, 28?) and (23a, 23b, 28a, 18b) on respective rails (9, 9?) (11, 11?), (9a, 9b, 11a, 11b) to assemble blocks (1) (1?) (1?) (1??), which are interconnected and used as a building block toy, or a random number of blocks (1) (10) (50) are stacked and assembled for observing the movement of a

Abstract: Provided is a toy building block which uses magnets, and which is a combination building block toy and teaching instrument with embedded magnets, wherein on each of the four edges of an upper frame (2) and lower frame (3), an inward-facing insertion aperture (6) is formed to connect internally to a central hollow portion (7), a magnetic ball (8) is inserted in the respective central hollow portions (7), and a projecting protrusion on the top and bottom of four pillars are inserted in the respective insertion apertures; and inward-facing projecting protrusions (21, 22, 23, 24), (25, 26, 27, 28) on an upper frame (20), lower frame (30), and pillars (40, 41, 42, 43), are respectively inserted in insertion grooves (23?, 24?, 27?, 28?) and (23a, 23b, 28a, 18b) on respective rails (9, 9?) (11, 11?), (9a, 9b, 11a, 11b) to assemble blocks (1) (1?) (1?) (1??), which are interconnected and used as a building block toy, or a random number of blocks (1) (10) (50) are stacked and assembled for observing the movement of a