--_000_D1E06B6B7E2juergbircherhelmedicacom_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Hi Howard, I am new to lmdb. I have been working with lmdb intensively for one month. = I really appreciate your great work. Good efficient C code is not always fo= und! Well I like to follow up on that reported issue. I am using multiple databases on the same environment. I was a bit confused= about your statement that most application use never subDBs? I think it is= a great feature that helps to support multiple indexes. I ran unintentionally into a related problem as I set the compare function = for the main db to an integer based one opposite to the literal compare fun= ction which is the default. Therefore when opening a database by its name t= he wrong database might be returned as the integer compare function might t= hink names are equal as only 96 bits (in my function) are compared. So the = compare function only compares the prefix of the database names! Maybe the database meta should be kept in a private space. But I also agree= on your statement to keep things simple. I solved the problem by never usi= ng the main db so under no circumstances the database meta is corrupted. I = think the price paid for having only named databases is very cheap as I ope= n databases at startup and keep the database index (dbi). Regards J=FCrg Rockethealth by Helmedica AG Web: www.rockethealth.ch<http://www.rockethealth.ch/> J=FCrg Bircher Chief Technology Officer Mail: [email protected]<mailto:[email protected]> --_000_D1E06B6B7E2juergbircherhelmedicacom_ Content-Type: text/html; charset="iso-8859-1" Content-ID: <[email protected]> Content-Transfer-Encoding: quoted-printable <html> <head> <meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3Diso-8859-= 1"> </head> <body style=3D"word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-lin= e-break: after-white-space; color: rgb(0, 0, 0); font-size: 14px; font-fami= ly: Calibri, sans-serif;"> <div>Hi Howard,</div> <div><br> </div> <div>I am new to lmdb. I have been working with lmdb intensively for one mo= nth. I really appreciate your great work. Good efficient C code is not alwa= ys found! </div> <div>Well I like to follow up on that reported issue.</div> <div>I am using multiple databases on the same environment. I was a bit con= fused about your statement that most application use never subDBs? I think = it is a great feature that helps to support multiple indexes. </div> <div>I ran unintentionally into a related problem as I set the compare func= tion for the main db to an integer based one opposite to the literal compar= e function which is the default. Therefore when opening a database by its n= ame the wrong database might be returned as the integer compare function might think names are equal as on= ly 96 bits (in my function) are compared. So the compare function only comp= ares the prefix of the database names!</div> <div>Maybe the database meta should be kept in a private space. But I also = agree on your statement to keep things simple. I solved the problem by neve= r using the main db so under no circumstances the database meta is corrupte= d. I think the price paid for having only named databases is very cheap as I open databases at startup and keep= the database index (dbi).</div> <div><br> </div> <div>Regards</div> <div>J=FCrg</div> <div><br> </div> <p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; = line-height: 11pt;"> <b><span lang=3D"EN-US" style=3D"font-size: 9pt; color: rgb(139, 141, 141);= font-family: 'FS Joey Medium';">Rockethealth by Helmedica AG<o:p></o:p></s= pan></b></p> <p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt;"= ><span lang=3D"EN-US" style=3D"font-size: 9pt; color: gray;">Web</span><spa= n lang=3D"EN-US" style=3D"font-size: 9pt; color: rgb(31, 73, 125);">: = </span><span style=3D"font-size: 9pt; color: rgb(31, 73, 125);"><a href=3D"= http://www.rockethealth.ch/"; style=3D"color: rgb(149, 79, 114);"><span lang= =3D"EN-US" style=3D"color: blue;">www.rockethealth.ch</span></a></span><spa= n style=3D"font-size: 9pt; color: rgb(31, 73, 125);"></span><span lang=3D"E= N-US" style=3D"color: rgb(31, 73, 125);"><o:p></o:p></span></p> <p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt;"= ><span lang=3D"EN-US" style=3D"font-size: 9pt; color: gray;">J=FCrg Bircher= </span></p> <p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt;"= ><span style=3D"color: gray; font-size: 9pt;">Chief Technology </span>= <span style=3D"color: rgb(128, 128, 128); font-size: 12px;">Officer</span><= /p> <p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt;"= ><span lang=3D"EN-US" style=3D"font-size: 9pt; color: gray;">Mail: </s= pan><span style=3D"font-size: 9pt; color: rgb(31, 73, 125);"><a href=3D"mai= lto:[email protected]" style=3D"color: rgb(149, 79, 114);"><sp= an lang=3D"EN-US" style=3D"color: blue;">[email protected]</span><= /a></span><span lang=3D"EN-US" style=3D"color: rgb(31, 73, 125);"><o:p></o:= p></span></p> <p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt;"= ><span style=3D"color: gray; font-size: 11pt;"> </span><span style=3D"= font-size: 14px;"> </span></p> </body> </html> --_000_D1E06B6B7E2juergbircherhelmedicacom_--
