Sybase 12.4.2 - Manual (Page 313)

CHAPTER 8 Transactions and Versioning
293
Figure 8-1: Only one writer at a time
Meanwhile, other users can read from the customer table at any time. In this
way queries can proceed while the database administrator inserts and deletes
table data. In Figure 8-2, User 3 and User 4 are able to query the
customer table
while User 1’s write transaction remains open.