Table of Contents
Advertisement
Overview of transactions and versioning
Multiple writers and readers in a database
294
Figure 8-2: One writer, multiple readers
Within an IQ database that is not multiplex, multiple read-only and read/write
users can operate concurrently, as long as the writers are inserting data into (or
deleting it from) different tables. So, for example, while User 1's transaction is
inserting and deleting in the
loads data into the
employee
other users can execute transactions that issue queries to both of these tables,
or to any other tables in the database.
In an IQ Multiplex database, read/write users must all connect to the write
server, whereas read-only users can connect to any query server or the write
server. For more information, see Adaptive Server IQ Multiplex User's Guide.
table, User 2 can begin a transaction that
customer
table, as shown in Figure 8-3. At the same time
Advertisement
Table of Contents
