DRCP - scenario of relief then to connect when he has not left in the session pool
Hello community of the Oracle,
I have a DRCP configured with a maximum pool size of N. Once all sessions N pool are used, we need to have a scenario of relief for the application that is trying to establish a new connection. As per documentation these new sessions are placed in the queue, so once the free locations appear in the pool - they get them. I realize there is nothing to the pool itself, there should be a timeout parameter / parameter sqlnet.ora or in OIC connect instead. But everything that I have reached my hands to-did not work for me: session hanged just wait a bit for pool to release.
Anyone does the same approach? What was your solution?
Is there a way I can use failover at the moment to connect here to pass the customer to use queue to DEDICATED by setting simply good alias tns TAF?
Thanks in advance,
Alex
Answer my first question: is there a way to trigger some kind of time-out and handle exception if the connection has failed within the time limit (as when the DRCP has no free sessions and incoming requests are put in queue)?
Probably it is there no out-of-box plus solution. Key word here is "non-blocking calls OIC.
The last mention of appeal without blocking connection was in Oracle OCI for the 7.3 database - http://www.helsinki.fi/~atkk_klp/oradoc/DOC/api/doc/OCI73/ch4a.htm#toc063
(unfortunately, this page of official documentation on the Oracle's Web site is damaged and does not the whole list of functions):
olog
Goal
olog() establishes a connection between a program of the OIC and an Oracle database.
Syntax olog(Lda_Def *lda, ub1 *hda, text *uid, sword uidl, text *pswd, sword pswdl, text *conn, sword connl, ub4 mode)Comments
....
mode Specifies whether the connection is blocking or non-blocking mode. Possible values are OCI_LM_DEF (for blocking) or OCI_LM_NBL (for the non-blocking).
Although the modern version of BEAK allows no blocking calls, but the appropriate setting (OCI_ATTR_NONBLOCKING_MODE) must be set only once the connection is established (OIC programming database -> handle and descriptor attributes ) and only affects subsequent calls.
Possible solutions for application developers I can see is the connection in the separate thread and drop it if it does not end in the defined period.
The above applies to DRCP, so I'm without touching the case when it could be solved with SQLNET. OUTBOUND_CONNECT_TIMEOUT and TCP. CONNECT_TIMEOUT
Tags: Database
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