Hi There is no such thing as a free lunch, certainly not for a 1M lines of code base :) On 9/12/12 12:27 AM, guangliang peng wrote:

hi, i am a new learner of monetdb.And i have some questions below.

1 when I ran some queries on monetdb,I found that the memory was automatically released by monetdb.And it needs extra time to load data into memory again.I don't know why and if there are some triggers in monetdb? Thank you for helps.

Understand how memory mapped files work on an operating system tells most of the story.

2 how do i see the join path when i run a query? Use the Plan/explain/Trace/debug or stethoscope features of the system to look for the {left,semi}join[Path] calls and the 'dot' file generated from the plans.

3 what's source code structure? i want to read the source code .And any advices for better understanding source code.

Read the MonetDB papers and PhD thesises. regards, Martin

thank,

guangliang peng

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