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We have recently added a lot of new packages to our system, and trying to determine incremental memory usage from a prior version of our product. I know I can get the sharable_mem value from v$db_object_cache. However, that will not include all packages in our schema, as they may be aged out.

Is there any way to determine the memory size of a package that is not in the object cache? And, I do not mean lines of source code (ALL_SOURCE), but size of whatever it is that oracle does under the hood to compile/parse the package.

Thanks!

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  • dba_object_size ... generally parsed_size+code_size should give you an idea. and then you can join with db_object_cache to see what is missing, how much size etc.
    – Raj
    Oct 19, 2017 at 17:21
  • Just out of curiosity, are you expecting that your code will consume a meaningful fraction of the available memory? I would be very surprised if the potential incremental increase in memory usage from code would be meaningful unless you're in a rather weird environment.
    – Justin Cave
    Oct 19, 2017 at 18:30
  • That's a good question. I am not 100% if it would matter relative to all the other stuff in the SGA, so maybe I am worried about a non-problem.
    – OldProgrammer
    Oct 19, 2017 at 18:42

2 Answers 2

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Have a look at PL/SQL Program Limits

In the shared memory pool, a package specification, ADT specification, standalone subprogram, or anonymous block is limited to 67108864 (2^26) DIANA nodes which correspond to tokens such as identifiers, keywords, operators, and so on. This allows for ~6,000,000 lines of code unless you exceed limits imposed by the PL/SQL compiler, some of which are given in Table C-1.

I remember long time ago with Oracle 8i I "managed" once to get an PLS-00123: program too large error. At this time the limit was 64K DIANA nodes.

I think nowadays it is hardly possible to exceed the limit.

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If you use PL/SQL collections, then the amount of memory needed to run a stored procedure is entirely data driven. How much data are you caching with each stored procedure?

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