Beefy Boxes and Bandwidth Generously Provided by pair Networks
Keep It Simple, Stupid
 
PerlMonks  

comment on

( #3333=superdoc: print w/replies, xml ) Need Help??
There are several issues with forking and using database handles opened in the parent.

At its most basic the underlying database client libraries must support this - the Sybase libraries do, but I have heard that the Oracle libraries do not.

Second, because the client usually maintains state associated with the connection you need to make sure that no operation is pending at the time of the fork. Otherwise you are likely to have a very confused connection.

Third, DBI maintains some state as well, and this has to be taken into consideration as well.

I know for a fact that I can fork a perl script that uses Sybase::CTlib and use the connection in the child. I can even fork it multiple times and use the same connection in multiple children, as long as the use is coordinated so that only one child has access to the connection at a time (see for example my Apache::Sybase::ConPool module.)
I have not tried this with DBI, but I would expect it to work, as long as no open statements exist at the time of the fork.

Michael


In reply to Re: Re: Re: forking and dbi by mpeppler
in thread forking and dbi by dlspinhir

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post; it's "PerlMonks-approved HTML":



  • Are you posting in the right place? Check out Where do I post X? to know for sure.
  • Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
    <code> <a> <b> <big> <blockquote> <br /> <dd> <dl> <dt> <em> <font> <h1> <h2> <h3> <h4> <h5> <h6> <hr /> <i> <li> <nbsp> <ol> <p> <small> <strike> <strong> <sub> <sup> <table> <td> <th> <tr> <tt> <u> <ul>
  • Snippets of code should be wrapped in <code> tags not <pre> tags. In fact, <pre> tags should generally be avoided. If they must be used, extreme care should be taken to ensure that their contents do not have long lines (<70 chars), in order to prevent horizontal scrolling (and possible janitor intervention).
  • Want more info? How to link or or How to display code and escape characters are good places to start.
Log In?
Username:
Password:

What's my password?
Create A New User
Domain Nodelet?
Chatterbox?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others rifling through the Monastery: (4)
As of 2022-08-11 15:21 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?

    No recent polls found

    Notices?