$MODULE = "MLDBM::Sync"; $VERSION = '.30'; $DATE = '2002/07/03';

+ Added MLDBM to the list of PREREQ_PM modules for better CPAN installation

$MODULE = "MLDBM::Sync"; $VERSION = .27; $DATE = '2002/06/23';

+ Added note to error for Lock upgrade during ReadLock for case of doing unintentional write with construct like:

tied(%dbm)->ReadLock;
my $v = $dbm{'key'}{'key2'}; # will error with write !!

^^^^^^^^^
Thanks to Steve Keith for noting this bizarre perl behavior.

+ bench/bench_sync.pl now creates a test dbm in the local directory being run instead of /tmp ... benchmark results were being skewed since /tmp could be a fast RAM cache file system like tmpfs on Linux

+ Added MANIFEST.SKIP for building

+ t/taint.t perl taint check test added.

+ escape inbound file parameter for safe taint checking

$MODULE = "MLDBM::Sync"; $VERSION = .25; $DATE = '2001/11/11';

+ Honors the $MLDBM::RemoveTaint setting when MLDBM::Sync object is created, storing for later creation of the MLDBM tied object

$MODULE = "MLDBM::Sync"; $VERSION = .23; $DATE = '2001/11/08';

+ Updated AUTHORS section with perl license reference.

+ ./bench/bench_sync.pl has -n argument to specify # of reads/writes where default is 100

+ ./bench/bench_sync.pl has --bundle argument to allows for reads/writes in locked sections of that #, which improves performance.

+ $dbm->Size() for Tie::TextDir now adds size of directory as reported by OS. This still does not seem to take into account the extra file inode overhead on a file system like ext2 linux but its better now at least.

$MODULE = "MLDBM::Sync"; $VERSION = .21; $DATE = '2001/10/31';

+ Added support in CLEAR() & SyncSize() for a tie directory based data structure like Tie::TextDir

$MODULE = "MLDBM::Sync"; $VERSION = .19; $DATE = '2001/10/15';

• Fixed keys(%hash), where one of the keys was boolean FALSE like '', or 0. Bug found by Elliot Glaysher.

$MODULE = "MLDBM::Sync"; $VERSION = .17; $DATE = '2001/10/11';

• Make EXISTS safe after explicity tied hash ReadLock()
• For loops in MLDBM::Sync::SDBM_File that are friendlier to perl5.004_04
• Better Lock() return value, whether or not a lock has previously been acquired

$MODULE = "MLDBM::Sync"; $VERSION = .15; $DATE = '2001/09/21';

• API fixes for easier integration with Apache::ASP
• Made $sync_dbm->UnLock() repeatable, with the next $sync_dbm->Lock() still working.

$MODULE = "MLDBM::Sync"; $VERSION = .11; $DATE = '2001/09/12';

++ Taking module out of BETA. Been using it in production

for 3 months, and in development for 6.

• Bug fix for undefined warning in MLDBM::Sync::SDBM_File
• MLDBM::Sync::SDBM_File STORE() now deletes prior key parts before storing the value, which will result in more correct behavior, there was a possible bug here. Added a test in t/sdbm_rec_big.t testing for this possible error.

+ Deletion of lock file when calling CLEAR(), or %dbm = () Do this after unlock, which might have a race condition but haven't seen in in heavy load testing... MLDBM::Sync recreates the lock file every time if necessary, so this may not be an issue anyway. Might be good to unlink before unlocking, but this might only work on *nix platformns, now Win32.

$MODULE = "MLDBM::Sync"; $VERSION = .09; $DATE = '2001/07/31';

• Bug fix for undefined warning in MLDBM::Sync::SDBM_File

$MODULE = "MLDBM::Sync"; $VERSION = .07; $DATE = '2001/03/18';

+ $dbm->SyncCacheSize() API activates 2nd layer RAM cache via Tie::Cache with MaxBytes set.

+ CACHE documentation, cache.t test, sample benchmarks with ./bench/bench_sync.pl -c

$MODULE = "MLDBM::Sync"; $VERSION = .05; $DATE = '2001/03/13';

+ Simpler use of locking.

• Read locking works on Solaris, had to open lock file in read/write mode. Linux/NT didn't care.

$MODULE = "MLDBM::Sync"; $VERSION = .03; $DATE = 'TBA';

+ $dbm_obj->SyncKeysChecksum(1) API documented. New internal format that does not store the original key with keys() & each() throwing errors now if used on this kind of database.

+ ReadLock() API added, that does a LOCK_SH internally. Also uses ReadLock() for FETCH and KEY operations. * WARNING: one may not ReadLock() and then write to the dbm, or that will die in an error. Must UnLock() first. Writes may only occur in a Lock() section, which does a LOCK_EX internally.

+ Better backward compatibility with old SDBM_Files for MLDBM::Sync::SDBM_File, also new format not compatible with .01 format.

+ Better test for MLDBM::Sync::SDBM_File, using keys with odd characters.

$MODULE = "MLDBM::Sync"; $VERSION = .01; $DATE = '2001/02/07';

+ Initial release with flock concurrent access control to MLDBM databases.

+ Also MLDBM::Sync::SDBM_File wrapper for getting around the 1024 byte / record limitation for sDBM_File. Writes data in segments of 128 bytes. This was created because SDBM_File access is an order of magnitude faster than DB_File on Linux with tie/untie per write in the MLDBM::Sync model, which is for i/o flushing do dbms don't get corrupt.

But, then one has to worry about exceeding the 1024 byte limit, which can happen for serializing larger objects. Well worry no more!