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I got the same error whatever dba_* function i use: i have tested on

Windows XP / PHP 4.2.0
Linux GNU Debian / PHP 4.1.2
Linux GNU Debian / PHP 4.3.1

dba support is enabled in all versions refering to phpinfo();

For a first start please only use db2 OR db3 support.
If this doesn't help disable ndbm also. Then enable flatfile and see if this works.

Since you cannot have both db2 and db3 enabled this stays bogus.

actually i have db2 support enabled and it does not work at all, i'll try and tell you what the result is without ndbm enabled.
what do you mean "enabling flatfile"?

Did another test: on a RedHat 8 / PHP 4.3.1

same result

With flatfile i mean "--enable-flatfile"

However do you use lib-d2.a or .so? 

In case of .a use the .so (it may be necessary to recompile db2 with "--enable-shared"). To test this use
"ldd php".

Just to add, this was NOT a bogus report, and the problem was visible on many systems, including FreeBSD. There IS something fishy going on with the DBA module, no the least with the (absence/improper use) of record locking. My final solution was to use a custom PHP-written flat file system, until all is solved.

well, its the same using "--enable-flatfile" with ndbm enabled or not

ivoras, another program is creating the database, so i can't change the file structure..