Path: csiph.com!v102.xanadu-bbs.net!xanadu-bbs.net!feeder.erje.net!eu.feeder.erje.net!bcyclone02.am1.xlned.com!bcyclone02.am1.xlned.com!newsfeed.xs4all.nl!newsfeed2.news.xs4all.nl!xs4all!newsgate.cistron.nl!newsgate.news.xs4all.nl!post.news.xs4all.nl!not-for-mail Return-Path: X-Original-To: python-list@python.org Delivered-To: python-list@mail.python.org X-Spam-Status: OK 0.024 X-Spam-Evidence: '*H*': 0.95; '*S*': 0.00; "subject:' ": 0.07; 'already.': 0.09; 'mentions': 0.09; '-tkc': 0.16; 'concurrent': 0.16; 'from:addr:python.list': 0.16; 'from:addr:tim.thechases.com': 0.16; 'from:name:tim chase': 0.16; 'operation.': 0.16; 'sqlite': 0.16; 'subject:dates': 0.16; 'subject:sqlite3': 0.16; 'thread,': 0.16; 'wrote:': 0.18; 'header :In-Reply-To:1': 0.27; "doesn't": 0.30; 'steven': 0.31; 'another': 0.32; 'subject: (': 0.35; 'problem.': 0.35; 'operations': 0.35; 'charset:us-ascii': 0.36; 'received:10': 0.37; 'performance': 0.37; 'to:addr:python-list': 0.38; 'to:addr:python.org': 0.39; 'duration': 0.60; 'most': 0.60; 'entire': 0.61; 'offer': 0.62; 'high': 0.63; 'such': 0.63; 'skip:n 10': 0.64; 'short,': 0.84 X-Sender-Id: wwwh|x-authuser|tim@thechases.com X-Sender-Id: wwwh|x-authuser|tim@thechases.com X-MC-Relay: Neutral X-MailChannels-SenderId: wwwh|x-authuser|tim@thechases.com X-MailChannels-Auth-Id: wwwh X-MC-Loop-Signature: 1424355616355:1876108804 X-MC-Ingress-Time: 1424355616355 Date: Thu, 19 Feb 2015 08:21:48 -0600 From: Tim Chase To: python-list@python.org Subject: Re: 'Lite' Databases (Re: sqlite3 and dates) In-Reply-To: <42b9ed87-a40a-4e70-afd3-304dc55fa0f0@googlegroups.com> References: <4154cc37-0bb0-4bf2-a52c-b728c737357c@googlegroups.com> <54E517B4.4000409@stoneleaf.us> <42b9ed87-a40a-4e70-afd3-304dc55fa0f0@googlegroups.com> X-Mailer: Claws Mail 3.8.1 (GTK+ 2.24.10; x86_64-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-AuthUser: tim@thechases.com X-BeenThere: python-list@python.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: General discussion list for the Python programming language List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Newsgroups: comp.lang.python Message-ID: Lines: 16 NNTP-Posting-Host: 2001:888:2000:d::a6 X-Trace: 1424371878 news.xs4all.nl 2972 [2001:888:2000:d::a6]:38340 X-Complaints-To: abuse@xs4all.nl X-Received-Bytes: 3763 X-Received-Body-CRC: 1181128365 Xref: csiph.com comp.lang.python:85924 On 2015-02-18 20:05, rurpy@yahoo.com.dmarc.invalid wrote: > Sqlite offers concurrent access already. > What Sqlite doesn't offer is high performance concurrent write > access. That is, it locks the entire database for the duration > of a write operation. Given that most such operations are pretty > short, for a small number of concurrent writers this is not a > big problem. Though the entire-database-lock, as Steven mentions in another section of this thread, causes issues on network-shared file-systems. -tkc