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  PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">

<concept id="GUID-05FDC28B-F033-5FDC-8F41-71BD212C27E2" xml:lang="en"><title>Access

modes</title><shortdesc>Describes the access modes supported by a database.</shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody>

<p>A named database supports three access modes:</p>

<ul>

<li id="GUID-BFF0FE8F-FCA1-57E4-BA1B-EB6B26955067"><p>Exclusive read/write

access</p> </li>

<li id="GUID-81273D9E-7999-5C7D-A8F9-5F13C8DE5A5A"><p>Shared read-only access</p> </li>

<li id="GUID-F04D5329-85C3-551A-8A32-26E6170CA69D"><p>Shared read/write access</p> </li>

</ul>

<p>The first two access modes are implemented through a file server session

which provides the necessary file access modes while shared read/write access

must be done through the DBMS server.</p>

<p>Creating a database through the <codeph>Create()</codeph> and <codeph>Replace()</codeph> member

functions of <codeph>RDbNamedDatabase</codeph>, initiates client-side access

to the database and does not require a connection to the DBMS server.</p>

<p><codeph>RDbNamedDatabase</codeph> offers two <codeph>Open()</codeph> functions,

one for client-side access and the other for client-server access. Client-side

access is preferred over client-server access as data retrieval is faster

than indirecting via the DBMS server.</p>

</conbody></concept>