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This is generally considered the most restrictive level of transaction isolation, but it provides the highest degree of isolation. A SERIALIZABLE transaction operates in an environment that makes it appear as if there are no other users modifying data in the database. Any row we read is assured to be the same upon a reread, and any query we execute is guaranteed to return the same results for the life of a transaction. For example, if we execute Select * from T; Begin dbms_lock.sleep( 60*60*24 ); end; Select * from T; the answers returned from T would be the same, even though we just slept for 24 hours (or we might get an ORA-1555: snapshot too old error, which is discussed in 8). The isolation level assures us these two queries will always return the same results. Side effects (changes) made by other transactions are not visible to the query regardless of how long it has been running. In Oracle, a SERIALIZABLE transaction is implemented so that the read consistency we normally get at the statement level is extended to the transaction.

Public Shared Operator =( _ ByVal obj1 As SmartDate, ByVal obj2 As SmartDate) As Boolean Return obj1.Equals(obj2) End Operator Public Shared Operator <>( _ ByVal obj1 As SmartDate, ByVal obj2 As SmartDate) As Boolean Return Not obj1.Equals(obj2) End Operator The Equals() method is relatively complex. This is because it supports the idea of comparing a SmartDate to another SmartDate, to a String value, or to a regular DateTime value. In each case, it honors the idea of an empty date value. Then the equality and inequality operators simply delegate to the Equals() method. There are overloads of the equality and inequality operators to allow a SmartDate to be directly compared to a DateTime or String value.

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ONLY. It has all of the qualities of the SERIALIZABLE isolation level, but it prohibits modifications. It should be noted that the SYS user (or users connected as SYSDBA) cannot have a READ ONLY or SERIALIZABLE transaction. SYS is special in this regard.

The DNS is capable of translating a server name like www.apress.com into a real IP address, and it can be used with the .NET Micro Framework, like in the full .NET Framework, with the static System.Net.Dns class. Dynamic DNS, which is enabled by default, attempts to automatically discover the DNS servers. You can verify if dynamic DNS is enabled by checking the read-only IsDynamicDnsEnabled property. You can also explicitly specify a list of DNS server IP addresses on your network using the EnableStaticDns method.

In addition to equality, it is possible to compare SmartDate values to see if they are greater than or less than another SmartDate, String, or DateTime value. This is easily accomplished given the implementation of the CompareTo() methods earlier. For instance, here are a couple of the comparison operators: Public Shared Operator >( _ ByVal obj1 As SmartDate, ByVal obj2 As SmartDate) As Boolean Return obj1.CompareTo(obj2) > 0 End Operator Public Shared Operator <( _ ByVal obj1 As SmartDate, ByVal obj2 As SmartDate) As Boolean Return obj1.CompareTo(obj2) < 0 End Operator Along with greater than and less than, there are greater than or equals, and less than or equals operators that work in a similar manner. And as with equality and inequality, there are overloads of all these operators for String and DateTime comparison as well.

Instead of results being consistent with respect to the start of a statement, they are preordained at the time you begin the transaction. In other words, Oracle uses the rollback segments to reconstruct the data as it existed when our transaction began, instead of just when our statement began. That s a pretty deep thought there the database already knows the answer to any question you might ask it, before you ask it. This degree of isolation comes with a price, and that price is the following possible error: ERROR at line 1: ORA-08177: can't serialize access for this transaction You will get this message whenever you attempt to update a row that has changed since your transaction began.

The Add() and Subtract() methods implemented earlier are also made available through operators: Public Shared Operator +( _ ByVal start As SmartDate, ByVal span As TimeSpan) As SmartDate Return New SmartDate(start.Add(span), start.EmptyIsMin) End Operator Public Shared Operator -( _ ByVal start As SmartDate, ByVal span As TimeSpan) As SmartDate Return New SmartDate(start.Subtract(span), start.EmptyIsMin) End Operator

Note Oracle attempts to do this purely at the row level, but you may receive an ORA-01877 error even

current version (2.5) of the .NET Micro Framework TCP/IP stack and will cause an exception if called from a managed application. Dynamic DNS address assignment is accomplished by enabling DHCP after setting the static DNS address to 0.0.0.0. For a detailed description and resolution to this and further issues related to DNS and DHCP, have a look at the .NET Micro Framework release notes file.

Public Shared Operator -( _ ByVal start As SmartDate, ByVal finish As SmartDate) As TimeSpan Return start.Subtract(finish.Date) End Operator Combined, all these methods and operators mean that a SmartDate can be treated almost exactly like a DateTime.

when the row you are interested in modifying has not been modified. The ORA-01877 error may happen due to some other row(s) being modified on the block that contains your row.

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