Synchronous database geo-mirroring using delayed visibility write operations

A method comprising:

• performing, by one or more hardware processors with associated memory that implement a primary database and a secondary database:
• receiving a write operation at the primary database;
• durably performing the write operation at the primary database without making the write operation visible to clients of the primary database;
• asynchronous to the performance of the write operation at the primary database, durably performing the write operation at the secondary database without making the write operation visible to clients of the secondary database, wherein the secondary database is configured to replicate the primary database;
• and
• based at least in part on a determination that the write operation has been made durable at both the primary and secondary databases, causing the write operation to be made visible to the clients of the primary and secondary databases.

One or more non-transitory computer-accessible storage media storing program instructions that when executed on or across one or more processors of a primary database, cause the primary database to:

• receive a write operation;
• durably perform the write operation at the primary database without making the write operation visible to clients of the primary database;
• send the write operation to a secondary database to cause the write operation to be asynchronously and durably performed at the secondary database without making the write operation visible to clients of the secondary database;
• and
• based at least in part on a determination that the write operation has been made durable at both the primary and secondary databases, cause the write operation to be made visible to the clients of the primary and secondary databases.