out of available locker entries

[Mike -- EMAIL IGNORED <m_d_berger_1900 yahoo com>]

On 2.6.22.1-41.fc7,

I get:

# rpm -q httpd
rpmdb: Lock table is out of available locker entries
rpmdb: Unknown locker ID: 909
error: db4 error(22) from db->close: Invalid argument
error: cannot open Packages index using db3 - Cannot allocate memory (12)
error: cannot open Packages database in /var/lib/rpm
package httpd is not installed

What is this and what can I do about it?

BTW, httpd is alive and well.

Thanks for your help.
Mike.