使用MonetDBLite C API连接到现有的数据库场

Question

I have a DB farm created with a database (ex: temp). When I try to connect to that using monetdb_startup, get the following error.

src/gdk/gdk_utils.c:1465: GDKfree: Assertion `(asize & 2) == 0' failed. Aborted (core dumped)

1. I'm using the sample application tests/readme/readme.c provided.
2. monetdb_startup("/dbfarm/temp", 0, 0) is what I'm trying to do.
3. Monet version being used: MonetDB 5 server v11.29.3 "Mar2018" (64-bit, 128-bit integers)

4. Stack trace:

     #0 0x0000003f39232495 in raise () from /lib64/libc.so.6 #1 0x0000003f39233c75 in abort () from /lib64/libc.so.6 #2 0x0000003f3922b60e in __assert_fail_base () from /lib64/libc.so.6 #3 0x0000003f3922b6d0 in __assert_fail () from /lib64/libc.so.6 #4 0x00007ffff799bc3c in GDKfree (s=0x19602e0) at src/gdk/gdk_utils.c:1465 #5 0x00007ffff79a8521 in freeException (msg=0x19602e0 '▒' <repeats 88 times>, "▒L\\001") at src/mal/mal/mal_exception.c:135 #6 0x00007ffff7b38c09 in SQLupgrades (c=0x7ffff42b2400, m=0x1815460) at src/mal/sqlbackend/sql_upgrades.c:1442 #7 0x00007ffff7b1edb2 in SQLinitClient (c=0x7ffff42b2400) at src/mal/sqlbackend/sql_scenario.c:612 #8 0x00007ffff7404f32 in monetdb_connect () at src/embedded/embedded.c:72 #9 0x00007ffff74055da in monetdb_startup (dbdir=0x7fffffffd7c0 "/dbfarm/temp/", silent=0 '\\000', sequential=0 '\\000') at src/embedded/embedded.c:162 

Thanks

Answer 1

In general, this use case is not supported. So upgrade MonetDBLite databases between versions should work fine, but moving from MonetDBLite to MonetDB and back is probably going to give errors and/or crash.