sharedkv: do not set cache_size by default

These DBs will probably be too small to be worth increasing the
cache size of.

1 files changed, 3 insertions, 1 deletions

diff --git a/lib/PublicInbox/SharedKV.pm b/lib/PublicInbox/SharedKV.pm
index b0588060..d65c3158 100644
--- a/lib/PublicInbox/SharedKV.pm
+++ b/lib/PublicInbox/SharedKV.pm
@@ -27,7 +27,9 @@ sub dbh {
                 });
                 my $opt = $self->{opt} // {};
                 $dbh->do('PRAGMA synchronous = OFF') if !$opt->{fsync};
-                $dbh->do('PRAGMA cache_size = '.($opt->{cache_size} || 80000));
+                if (my $s = $opt->{cache_size}) {
+                        $dbh->do("PRAGMA cache_size = $s");
+                }
                 $dbh->do('PRAGMA journal_mode = '.
                                 ($opt->{journal_mode} // 'WAL'));
                 $dbh->do(<<'');