Probably 4.25

With

$ pmvers DBI DBD::SQLite DB_File BerkeleyDB
DBI: 1.616
DBD::SQLite: 1.33
DB_File: 1.824
BerkeleyDB: 0.49

$ perl -MBerkeleyDB -le " print $BerkeleyDB::db_version
5.1

$ perl -MDB_File -le " print $DB_File::db_version "
5.1
[download]

DBD-SQLite-1.33 has #define SQLITE_VERSION "3.7.6.3"

                 Rate I SQLite I Hash (A) I Hash I B+Tree (A) I SQLite
+ 2 I B+Tree
I SQLite      10079/s       --       -60%   -62%         -83%       -8
+9%     -90%
I Hash (A)    25263/s     151%         --    -5%         -57%       -7
+2%     -75%
I Hash        26478/s     163%         5%     --         -55%       -7
+0%     -74%
I B+Tree (A)  58196/s     477%       130%   120%           --       -3
+5%     -42%
I SQLite 2    89419/s     787%       254%   238%          54%         
+--     -12%
I B+Tree     101180/s     904%       301%   282%          74%        1
+3%       --
                Rate S SQLite S Hash(A)   S Hash S B+Tree(A) S B+Tree 
+S SQLite 2
S SQLite     16411/s       --      -66%     -72%        -81%     -82% 
+      -85%
S Hash(A)    48038/s     193%        --     -19%        -45%     -46% 
+      -56%
S Hash       59055/s     260%       23%       --        -32%     -34% 
+      -46%
S B+Tree(A)  87209/s     431%       82%      48%          --      -2% 
+      -21%
S B+Tree     89286/s     444%       86%      51%          2%       -- 
+      -19%
S SQLite 2  109890/s     570%      129%      86%         26%      23% 
+        --
bdb.hash.test :10469376
bdb.btree.test :13410304
bdb.hash.a.test :10616832
bdb.btree.a.test :7159808
sqlite.test :6668288
sqlite2.test :6668288
[download]

It is now possible to compile libdb with sqlite3 interface, and link DBD::SQLite against it

BerkeleyDB:SQL performance and concurrency is superior to SQLite in write-intensive applications and heavy workloads, allowing it to get higher TPS throughput

4000 transactions per-second (TPS) scaling well up to 100 connections, whereas SQLite remains constant at 500 TPS,