Die InnoDB Storage Engine:

Die InnoDB Storage Engine wird in MySQL verwendet, um Transaktionssicherheit zu gewährleisten. Der Vortrag erklärt die Konzepte und Ideen hinter der Engine, wie sie konfiguriert wird und wie man sie in einer Anwendung benutzt.

Referent: Kristian Köhntopp.

Nächsten Montag. Um 19:30 Uhr. Im new thinking Store.

(Dies ist die zweite Vorwarnung - damit Ihr Euren …

PROJECT: Adding parallelism to mysqldump
WEEK 06

KEY ACCOMPLISHMENTS LAST WEEK

None.

KEY TASKS THAT STALLED LAST WEEK

Out-of-memory error when dumping big databases

KEY CONCERNS

I couldn’t fix the out-of-memory error. It only happens when I have DBs with big tables. The error happens because memory to the dynamic string could not be allocated. Hope I can fix this soon and move on with the project.

TASKS IN THE UPCOMING WEEK

* Solve the out-of-memory error
* Start using BZR to submit patches, and also submit to internals mailing list, to get feedback from the community
* Start refining the prototype to add a command-line parameter to specify the number of threads

Aus der ACM Queue schreibt uns Dan Pritchett (eBay) "BASE - An ACID Alternative":

In partitioned databases, trading some consistency for availability can lead to dramatic improvements in scalability.

(via hohjg)

Hi all,

Classes are finally over… now I can dedicate more time to this project

Report for last week is a little ’empty’…

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PROJECT: Adding parallelism to mysqldump
WEEK 04

KEY ACCOMPLISHMENTS LAST WEEK
None.
Last week of exams at university took me a lot of time. I should have take that into account when doing my last report.

KEY TASKS THAT STALLED LAST WEEK
N/A

KEY CONCERNS
None. In fact, I’m glad I’ll be able to dedicate more time to the program now that classes are over

TASKS IN THE UPCOMING WEEK
(same as last week)

* Solve the out-of-memory error
* Refine the prototype to add a command-line parameter to specify the number of threads
* Fix some minor coding standard issues
* Start using BZR to …

Daß RAM eine Feine Sache (tm) ist, wenn man eine Datenbank betreiben will, ist ja der Kern vieler meiner Ausführungen zu diesem Thema. Daß Flash kein "RAM" im engeren Sinne ist, wird dabei gerne einmal überhört - Flash Disks stinken aber generell ab, wenn sie beschrieben werden und noch mehr, wenn sie mit Random I/O beschrieben werden. Selbst etwas so langsames und mechanisches wie eine traditionelle Festplatte gewinnt hier. Was man stattdessen will ist RAM mit Batterie.

Nun gibt es auch Spezialisten, die sich ein Notebook mit Flash statt Harddisk haben aufschwatzen lassen, denn immerhin kann Flash nicht durch Fall-Schock kaputt gehen und außerdem braucht es weniger Strom. Braucht es wohl, denn Daten auf ein Flash zu braten frißt nun einmal Leistung.

So, report for week #4 is here… a little late, though
Classes at MScs course are almost over :)… last exam is next tuesday, and then I’ll be able to dedicate more time to the program.
But this week I thought I got a lot of progress… the threaded mysqldump is working (with some problems when large tables are selected), and a speedup of 1,9x was measured with a DB of 600MB, in a quad-core machine. COOL!!!

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PROJECT: Adding parallelism to mysqldump
WEEK 04

First of all, sorry this report is a little late…

KEY ACCOMPLISHMENTS LAST WEEK

* Reworked connect_to_db so that I can create one connection for each thread now.
* Reworked some functions to turn them into thread-safe. This implied eliminating global variables mysql, extended_row and insert_pat, that are now passed as parameters when needed.
* Finished a prototype where one thread is generated by table to be …

PROJECT: Adding parallelism to mysqldump
WEEK 03

KEY ACCOMPLISHMENTS LAST WEEK

* Started implementing a new prototype, adding support to more threads. The inicial idea is to have one thread per table to be dumped, for now. This can be refined later.

KEY TASKS THAT STALLED LAST WEEK

* Couldn’t finish this new prototype. Actually, I’m having problems reworking the connect_to_db method, so that I can create one connection for each thread.

KEY CONCERNS

* I have to deliver this prototype working and with some speedup for a grad. course by the end of the week.
* Semester at grad ends by the end of June.. Exams, assignments

TASKS IN THE UPCOMING WEEK

* Finish this prototype
* Refine the prototype to add a command-line parameter to specify the number of threads, and manage the way each thread gets the tables they will be in charge of dumping
* Still …

Am 14. Juli halte ich im newthinking store in der Tucholskystraße 48, Berlin einen Vortrag über die InnoDB Storage Engine. Inhaltlich wird sich das ganze an den beiden Blogartikeln zum Thema orientieren, sodaß ich weniger Arbeit damit habe. :) Aber wie immer gilt am Ende das gesprochene Wort...

So, here it goes my new report…
Until the end of June, when my semester at grad. ends, things are going to progress slowly

PROJECT: Adding parallelism to mysqldump

KEY ACCOMPLISHMENTS LAST WEEK

* Implemented and tested the second prototype, that starts a single thread and runs the dump code inside it.
* Set up bazaar repository

KEY TASKS THAT STALLED LAST WEEK

* Couldn’t blog more and work as I wish…
* Didn’t send the patch to internals mailing list

KEY CONCERNS

* I have to deliver a prototype supporting lots of threads running simultaneously and with some speedup for a grad. course by June, 18;
* Semester at grad ends by the end of June.. Exams, assignments

TASKS IN THE UPCOMING WEEK

* Refine the prototype to add support for more threads – synchronization, passing the correct parameters to each thread
* Patch prototype …

New week… new report

KEY ACCOMPLISHMENTS LAST WEEK

* Identified in the source code where parallelism could be exploited
* Implemented first prototype – some global variables that are going to be passed to the threads were identified and passed as parameters to the dump methods.
* Tested first prototype.
* Communicated via IRC with my mentor (just via e-mail previously) – timezone doesn’t help
* Discovered some related script-based tools. Thanks to Giuseppe Maxia for the tip!

KEY TASKS THAT STALLED LAST WEEK

* Some problems working with a mysql development build for the very first time, but already ok.

KEY CONCERNS

* Semester at grad ends at the end of June.. Exams, assignments

TASKS IN THE UPCOMING WEEK

* Set up bazaar repository
* Patch the first prototype and submit to internals@ to receive feedback
* Implement next step: …