libzdb-general

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148 discussions

Re: libzdb memory leakage
by Pavlo Lavrenenko 11 Apr '13

11 Apr '13

On 04/10/2013 05:47 PM, Volodymyr Tarasenko wrote: > Hi Pavlo, > > Could you check my last commit? Jan is planning to release 2.11.2 > version, I would like to be sure that this fix is working for you... > > Good luck, > Volodymyr! > I've checked recent changes and everything works as expected. Thanks. -- Best regards, Pavlo Lavrenenko, PortaOne, Inc., Junior Software Developer Tel: +1-866-SIP VOIP (+1 866 747 8647) ext. 7624 PortaOne - VoIP Solutions Company Visit our Website: http://www.portaone.com

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libzdb memory leakage
by Pavlo Lavrenenko 10 Apr '13

10 Apr '13

Hi. I have a question regarding http://code.google.com/p/libzdb/source/detail?r=538 commit. Currently because of next check: > if (R->columns[i].buffer) { > *size = (int)R->columns[i].length; > return (const void *)R->columns[i].buffer; > } its possible to return a buffer with the size smaller than actual blob size. OracleResultSet_getBlob() should fall through to the loop with OCILobRead2() and RESIZE() with a check like: > if (R->columns[i].buffer == NULL) { > R->columns[i].buffer = ALLOC(LOB_CHUNK_SIZE); > } prior to the loop mentioned. Should I duplicate this mail to bugs-libzdb(a)tildeslash.com? Do you guys have mailing list archive available? -- Best regards, Pavlo Lavrenenko, PortaOne, Inc., Junior Software Developer Tel: +1-866-SIP VOIP (+1 866 747 8647) ext. 7624 PortaOne - VoIP Solutions Company Visit our Website: http://www.portaone.com

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[Announce] libzdb 2.11.1
by Jan-Henrik Haukeland 19 Dec '12

19 Dec '12

Hi everyone Version 2.11.1 of libzdb is now available: Download: http://tildeslash.com/libzdb/dist/libzdb-2.11.1.tar.gz MD5 checksum: 155e89d96df4ec22e984442137f75289 Changes in this release: ------------------------ Fixed: MySQL: A ResultSet bind memory error could occur if string or blob columns of different size caused successive buffer reallocation. Thanks to Ryan Addams for discovering the problem.

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[Announce] libzdb 2.11
by Jan-Henrik Haukeland 06 Dec '12

06 Dec '12

Hi everyone Version 2.11 of libzdb is now available: Download: http://tildeslash.com/libzdb/dist/libzdb-2.11.tar.gz MD5 checksum: f2e44cde8d270d83d8e8c169ed4110fe Changes in this release: ------------------------ * New: Added support for the new bytea hex encoding format introduced in PostgreSQL 9.0. This means that ResultSet_getBlob will correctly return the binary stored in a bytea column independent if the column is escape encoded (old format) or hex encoded (new format). * Fixes: MySQL: A table with two or more columns larger than 256 bytes would cause libzdb to truncate the second column to 256 bytes in the first row. Thanks to Me from China for bug report and patch. * Fixes: Improved Build Configuration. Thanks to Johan Bergström for report

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19 Nov '12

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by krieg＠tildeslash.com 18 Nov '12

18 Nov '12

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mysql executeQuery uses prepared statement
by Julien Coloos 09 Nov '12

09 Nov '12

Hi, It appears libzdb mysql implementation of Connection_executeQuery actually uses a prepared statement to query the database. This may consume a lot more resources than doing a standard query. At least each query generates 3 actions (statement preparation, execution and then closing). On one of our mysql servers handling up to 4K selects per second, the reported number of operations went up to more than 10K, and the CPU usage went from ~2% user and ~1% system to ~6% user and ~12% system. Some older servers did not have enough CPU available to handle the new load. Is there a reason for using a (lone) prepared statement for each query, or could there be a way in future versions of the library to at least allow to do standard queries (mysql_query or mysql_real_query, and mysql_fetch_*) ? Regards

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[Announce] libzdb 2.10.6
by Jan-Henrik Haukeland 30 Oct '12

30 Oct '12

Hi everyone Version 2.10.6 of libzdb is available: Download: http://tildeslash.com/libzdb/dist/libzdb-2.10.6.tar.gz MD5 checksum: 60d27a7c3857a8fd62da7ba89daa5c25 This is mostly a bug fix release which has been tested on the following platforms: * Linux 2.6 (x86 and x64) * Mac OS X Mountain Lion (Darwin 10.8.x x86_64) * Mac OS X Lion (Darwin 10.7.x x86_64) * FreeBSD 6.x, 7.x and 8.x (x86 and x64) * Solaris 10 and Solaris Express (sparc and x86) * OpenBSD 4.x (x86 and x64) Changes in this release: ------------------------ * New: ConnectionPool_start() now throws an SQLException instead of calling ABORT if starting the pool failed. Thanks to Christopher O'Hara for suggestion. * Fixes: MySQL: Using a stored procedure which returned a result set would freeze the connection until it was reaped. Thanks to Jesse White for patch. * Fixes: Ensure that the library can be restarted after it was stopped without leaking resources. Only applicable for MySQL which could leak memory on runtime restart. Thanks to Axel Steiner for initial patch and suggestion. Restartable in this context means that you can call ConnectionPool_start and ConnectionPool_stop repeatedly.

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Firebird Database Support
by Christian Mölders 15 Aug '12

15 Aug '12

Hi @ all! My name is Christian and I want to use dbMail with Firebird Databases. dbMails database connectivity based up on libzdb. However no Firebird-Driver exist, so I have joined this group to support the libzdb-project and develop the driver on my own. C is not my preferred codeing language, comeing from Java, Scala and PHP, therefore I will ask a lot ;-) I only coded the typical C apps with few hundred lines of code while studying. Please let me know, if there are any informations or existing approaches for an implementation of the Firebird Driver. Thanks! -- Christian Moelders Software engineer Im Schacht 1 D-35435 Wettenberg Cell: +49 1578 4492525 Mail: cm(a)christian-moelders.de http://christian-moelders.de - out of date ;-)

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OS X Mountain Lion and libzdb
by Jan-Henrik Haukeland 29 Jul '12

29 Jul '12

Just a quick FYI for those attempting to build libzdb 2.10.5 on OS X (10.8) Mountain Lion. Libzdb failed to build on 10.8 because Apple had removed libfl which was required to build a scanner tool used by libzdb. Thanks to a patch from Johan Bergström, I have uploaded a new version of libzdb 2.10.5 which modify configure to also check for libl which works equally well for libzdb. There are no other changes other than configure.ac so I decided to keep the version number. (Apologies to package purists which may not like this). So if you have updated to Mountain Lion, please download libzdb _again_ from http://tildeslash.com/libzdb/dist/libzdb-2.10.5.tar.gz and it should work again.

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