Techniques to perform gradual upgrades

1. A method, comprising:

installing a new version of an application program;

converting a data set for a previous version of said application program to a data schema used by said new version one data segment at a time;

converting a first data segment for said previous version to said data schema;

providing access to a second data segment for said previous version while converting said first data segment; and

preventing access to said first data segment during said conversion.

2. The method of claim 1 , comprising:

identifying a domain name for said previous version;

creating a temporary domain name for said previous version;

renaming said domain name to said temporary domain name; and

redirecting access requests with said domain name to said temporary domain name.

3. The method of claim 1 , comprising:

identifying a domain name for said previous version; and

using said domain name for said new version once said data set has been converted.

4. The method of claim 1 , comprising interfacing with other application programs to convert corresponding data sets in accordance with converting said data set for said previous version.

5. The method of claim 1 , comprising selecting a data segment having data from one or more content databases used by a web application.

6. The method of claim 1 , comprising selecting a data segment having data from one or more content databases used by a hierarchical group of web applications.

7. An article comprising a machine-readable storage medium containing instructions that executed enable a system to install a new version of an application program, convert a data set for a previous version of said application program to a data schema used by said new version one data segment at a time, convert a first data segment for said previous version to said data schema, provide access to a second data segment for said previous version while converting said first data segment, and prevent access to said first data segment during said conversion.

8. The article of claim 7 , further comprising instructions that if executed enable the system to identify a domain name for said previous version, create a temporary domain name for said previous version, rename said domain name to said temporary domain name, and redirect access requests with said domain name to said temporary domain name.

9. The article of claim 7 , further comprising instructions that if executed enable the system to identify a domain name for said previous version, and use said domain name for said new version once said data set has been converted.

10. The article of claim 7 , further comprising instructions that if executed enable the system to select a data segment having data from one or more content databases used by a web application.

11. The article of claim 7 , said machine-readable storage medium comprising a computing device, a computer-readable medium, or a communications medium.

12. An apparatus, comprising:

a database with a data set for a first version of an application program;

a computing device to couple to said database, said computing device having a processor and memory, said memory to store a first version of an application program, an installer program, and a gradual update engine; and

said processor to execute said installer program to install a second version of said application program, and said gradual update engine to convert said data set to a data schema used by said second version one data segment at a time, provide access to one data segment while converting another data segment, and lock a data segment during conversion to prevent write access to said data segment.

13. The apparatus of claim 12 , said gradual update engine to redirect access requests to a first domain name for said first version to a second domain name for said first version during conversion operations.

14. The apparatus of claim 12 , said gradual update engine to select a data segment having data from one or more content databases used by a web application.