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  • Generating a record of the full(-ish) package management state

    - by intuited
    I'm about to make some system changes and I'd like to have a record of my current happy system state. Is there a convenient way to create a record of this? I'd like to keep track of info like currently installed packages and their versions which packages are pinned at what version which source (as in /etc/apt/sources.list) they were installed from whether they were installed directly or automatically installed as a dependency of a different package "unknown unknowns": ie stuff that I don't know that I should be keeping track of but which may be important when trying to figure out why something doesn't work In short, I'd like to keep as much of the aptitude database as possible. What's the best way to do this? It would be nice if the resulting records were easily readable, though this is not really essential. It would be extra nice if it were readily versionable through an SCM tool like git. There is a superuser question that partially answers this, but it only provides the list of currently installed packages.

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  • Generating a record of the full(-ish) package management state

    - by intuited
    I'm about to make some system changes and I'd like to have a record of my current happy system state. Is there a convenient way to create a record of this? I'd like to keep track of info like currently installed packages and their versions which packages are pinned at what version which source (as in /etc/apt/sources.list) they were installed from whether they were installed directly or automatically installed as a dependency of a different package "unknown unknowns": ie stuff that I don't know that I should be keeping track of but which may be important when trying to figure out why something doesn't work In short, I'd like to keep as much of the aptitude database as possible. What's the best way to do this? It would be nice if the resulting records were easily readable, though this is not really essential. It would be extra nice if it were readily versionable through an SCM tool like git. There is a superuser question that partially answers this, but it only provides the list of currently installed packages.

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  • Reverse DNS does not match SMTP banner vs Reverse DNS mismatch

    - by MadBoy
    I have to make decision whether my Reverse DNS should match SMTP banner but Reverse DNS to DNS and vice versa stays different or vice versa. Which one to choose? I have an 2x Exchange 2010 server with one SMTP Sender with TMG 2010. TMG has 2 links connected so that we have 2 separate internet providers. The problem is I have no way to control TMG behavior on which link is used to send emails as it picks it randomly. I have 2 MX records: - mail.test.com which resolves to IP and IP resolves to mail.test.com - mail2.test.com which resolves to IP2 and IP2 resolves to mail.test.com This was done to prevent smtp banner issues but it provides problems with Reverse DNS if the server on the other side is eager enough to do comparison. But I've checked with Google and they also don't have that in perfect condition.

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  • In MySQL 5.1 InnoDB, does the maximum length of a VARCHAR affect secondary index size?

    - by e_tothe_ipi
    Assuming the data is the same either way, does the maximum length of the VARCHAR affect the space usage of a secondary index? Does InnoDB use fixed length records for indexes? Assume that we're talking about MySQL 5.1, with the InnoDB COMPRESSED table format and that the field in question is defined as a VARCHAR with some length less than or equal to 255 (so that it uses only one byte for the offset). Here is the use case: I have a server with a very large table (several gigabytes). One of the fields is currently VARCHAR(7). We need it a little longer and we are thinking of making it VARCHAR(255), but we are worried that it bloat the index.

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  • Do I need to buy Mysql cluster enterprise edition?

    - by Arman
    Hello, we have a ms-sql 2008 standard edition. The db became too huge, about 8 10^9 records.the db files are about 4.5tb each. We cannot effort us to get enterprise edition to slice the database. We need partitioning. So the idea is to use Mysql cluster with many datanodes. We already started to move data. I wondered do we need to buy a licens for mysqlcluster?are there performance difference between community edition and commercial one? Thanks Arman.

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  • Cannot create a new domain in an existing active directory forest

    - by Mackenzie Carr
    I have a domain controller setup on Windows Server 2008 R2 (Forest) and I have another Windows Server 2008 R2 (New Domain) and I want to create a new domain in an existing forest. I get the following error: An Active Directory domain controller for the domain mackdev.mackenziecarr.com could not be contacted The error was "no records found for the given DNS query" The query was for the SRV record for: _ldap._tcp.dc._msdcs.mackdev.mackenziecarr.com I've seem to have tried everything even tried adding this record to the DNS server of the primary forest. I even successfully joined this server to the domain without any issues but trying to create a new domain under the existing forest is no luck. The primary forest I.P. address is 192.168.2.20 the server that I am using to try to make a child domain is 192.168.2.21 My ipconfig are as follows: I.P. Address: 192.168.2.21 Subnetmask: 255.255.255.0 Gateway: 192.168.2.1 Primary DNS: 192.168.2.20

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  • Sync a specific folder of contacts to iPhone

    - by colemanm
    Is there a simple way to organize contacts in Outlook/Entourage and only have a subset of them synchronize with the iPhone over Exchange ActiveSync? Our CEO has thousands of contacts in his mailbox, but would prefer if only a small portion of them synched to his phone over the air... The iPhone's performance takes a huge hit keeping that massive dataset in order. If he could put some of the records in subfolders or something and only sync the top level, I think that would work for him. Does anyone know if this is possible?

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  • PowerDNS 3+ - Recursive queries for subdomains

    - by PDNS Troubles
    We are trying to find functionality in the PDNS 3.x that existed in PDNS < 2.9.2.5. Whereby if we have a domain in the database backend with records, if a query is unable to resolve a subdomain it would then query the recursor setup in the pdns.conf file. We have found that on Centos 6.x the rpm packages are the latest verison of pdns where by 5.x available was pdns-2.9.22-4.el5. The pdns-2.9.22-4.el5 package works as expected but when upgrading servers to Centos 6.x we loose this required functionality. pdns-backend-mysql-2.9.22-4.el5.rpm fails to install on Centos 6.x due to mysql libs that aren't availble, this is caused by an upgrade in the mysql version whereby the pdns backend mysql requires older mysql libs then what is available on centos 6.x . Installing from source is also troublesome with the following errors - http://pastebin.com/B5cUuD08

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  • linux dns server

    - by Clear.Cache
    Can someone explain to me how to easily setup a centos 5 (64bit) dns server? I want to use this strictly for dns for my clients who require rdns (ptr) for their domains. I do have IP delegation/authority from the data center and allocated IPs directly from ARIN. I just want to setup a Centos 5 box to use strictly as a dns server, perhaps with redundancy with a secondary, clustered (or not) dns server Server 1 = dns1.mycompany.com Server 2 = dns2.mycompany.com Then, I need simply instructions on how to create rdns records for clients upon request, especially in bulk amounts. Thank you.

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  • MySQL Query GROUP_CONCAT Over Multiple Rows

    - by PeteGO
    I'm getting name and address data out of generic question / answer data to create some kind of normalised reporting database. The query I've got uses group_concat and works for individual sets of questions but not for multiple sets. I've tried to simplify what I'm doing by using just forename and surname and just 3 records, 2 for 1 person and 1 for another. In reality though there are more than 300,000 records. Example of results with qs.Id = 1. QuestionSetId Forename Surname ------------------------------------------------------- 1 Bob Jones Example of results with qs.Id IN (1, 2, 3). QuestionSetId Forename Surname ------------------------------------------------------- 3 Bob,Bob,Frank Jones,Jones,Smith What I would like to see for qs.Id IN (1, 2, 3). QuestionSetId Forename Surname ------------------------------------------------------- 1 Bob Jones 2 Bob Jones 3 Frank Smith So how can I make the 2nd example return a separate row for each set of name and address information? I realise the current way the data is stored is "questionable" but I cannot change the way the data is stored. I can get sets of individual answers but not sure how to combine the others. My simplified Schema that I cannot change: CREATE TABLE StaticQuestion ( Id INT NOT NULL, StaticText VARCHAR(500) NOT NULL); CREATE TABLE Question ( Id INT NOT NULL, Text VARCHAR(500) NOT NULL); CREATE TABLE StaticQuestionQuestionLink ( Id INT NOT NULL, StaticQuestionId INT NOT NULL, QuestionId INT NOT NULL, DateEffective DATETIME NOT NULL); CREATE TABLE Answer ( Id INT NOT NULL, Text VARCHAR(500) NOT NULL); CREATE TABLE QuestionSet ( Id INT NOT NULL, DateEffective DATETIME NOT NULL); CREATE TABLE QuestionAnswerLink ( Id INT NOT NULL, QuestionSetId INT NOT NULL, QuestionId INT NOT NULL, AnswerId INT NOT NULL, StaticQuestionId INT NOT NULL); Some example data for only forename and surname. INSERT INTO StaticQuestion (Id, StaticText) VALUES (1, 'FirstName'), (2, 'LastName'); INSERT INTO Question (Id, Text) VALUES (1, 'What is your first name?'), (2, 'What is your forename?'), (3, 'What is your Surname?'); INSERT INTO StaticQuestionQuestionLink (Id, StaticQuestionId, QuestionId, DateEffective) VALUES (1, 1, 1, '2001-01-01'), (2, 1, 2, '2008-08-08'), (3, 2, 3, '2001-01-01'); INSERT INTO Answer (Id, Text) VALUES (1, 'Bob'), (2, 'Jones'), (3, 'Bob'), (4, 'Jones'), (5, 'Frank'), (6, 'Smith'); INSERT INTO QuestionSet (Id, DateEffective) VALUES (1, '2002-03-25'), (2, '2009-05-05'), (3, '2009-08-06'); INSERT INTO QuestionAnswerLink (Id, QuestionSetId, QuestionId, AnswerId, StaticQuestionId) VALUES (1, 1, 1, 1, 1), (2, 1, 3, 2, 2), (3, 2, 2, 3, 1), (4, 2, 3, 4, 2), (5, 3, 2, 5, 1), (6, 3, 3, 6, 2); Just in case SQLFiddle is down here are the 3 queries from the examples I've linked to: 1: - working query but only on 1 set of data. SELECT MAX(QuestionSetId) AS QuestionSetId, GROUP_CONCAT(Forename) AS Forename, GROUP_CONCAT(Surname) AS Surname FROM (SELECT x.QuestionSetId, CASE x.StaticQuestionId WHEN 1 THEN Text END AS Forename, CASE x.StaticQuestionId WHEN 2 THEN Text END AS Surname FROM (SELECT (SELECT link.StaticQuestionId FROM StaticQuestionQuestionLink link WHERE link.Id = qa.QuestionId AND link.DateEffective <= qs.DateEffective AND link.StaticQuestionId IN (1, 2) ORDER BY link.DateEffective DESC LIMIT 1) AS StaticQuestionId, a.Text, qa.QuestionSetId FROM QuestionSet qs INNER JOIN QuestionAnswerLink qa ON qs.Id = qa.QuestionSetId INNER JOIN Answer a ON qa.AnswerId = a.Id WHERE qs.Id IN (1)) x) y 2: - working query but undesired results on multiple sets of data. SELECT MAX(QuestionSetId) AS QuestionSetId, GROUP_CONCAT(Forename) AS Forename, GROUP_CONCAT(Surname) AS Surname FROM (SELECT x.QuestionSetId, CASE x.StaticQuestionId WHEN 1 THEN Text END AS Forename, CASE x.StaticQuestionId WHEN 2 THEN Text END AS Surname FROM (SELECT (SELECT link.StaticQuestionId FROM StaticQuestionQuestionLink link WHERE link.Id = qa.QuestionId AND link.DateEffective <= qs.DateEffective AND link.StaticQuestionId IN (1, 2) ORDER BY link.DateEffective DESC LIMIT 1) AS StaticQuestionId, a.Text, qa.QuestionSetId FROM QuestionSet qs INNER JOIN QuestionAnswerLink qa ON qs.Id = qa.QuestionSetId INNER JOIN Answer a ON qa.AnswerId = a.Id WHERE qs.Id IN (1, 2, 3)) x) y 3: - working query on multiple sets of data only on 1 field (answer) though. SELECT qs.Id AS QuestionSet, a.Text AS Answer FROM QuestionSet qs INNER JOIN QuestionAnswerLink qalink ON qs.Id = qalink.QuestionSetId INNER JOIN StaticQuestionQuestionLink sqqlink ON qalink.QuestionId = sqqlink.QuestionId INNER JOIN Answer a ON qalink.AnswerId = a.Id WHERE sqqlink.StaticQuestionId = 1 /* FirstName */ AND sqqlink.DateEffective = (SELECT DateEffective FROM StaticQuestionQuestionLink WHERE StaticQuestionId = 1 AND DateEffective <= qs.DateEffective ORDER BY DateEffective DESC LIMIT 1)

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  • filtering jqgrid based on user input

    - by Rohan
    hi, everything is working fine with my jqgrid except a small issue. i have defined postData below: $(document).ready(function() { $("#ctl00_ContentPlaceHolder2_drpUSite").change(function() { site = ($("#ctl00_ContentPlaceHolder2_drpUSite").val()); loadusergrid(); }); var usrparams = new Object(); var site = ($("#ctl00_ContentPlaceHolder2_drpUSite").val()); //----grid code--------- $("#users").jqGrid({ prmNames: { _search: "isSearch", nd: null, rows: "numRows", page: "page", sort: "sortField", order: "sortOrder" }, // add by default to avoid webmethod parameter conflicts postData: { searchString: '', searchField: '', searchOper: '', sites: site }, datatype: function(postdata) { mtype: "GET", $.ajax({ url: 'Users.aspx/GetUsers', type: "POST", contentType: "application/json; charset=utf-8", data: JSON.stringify(postdata), dataType: "json", success: function(data, st) { if (st == "success") { var grid = $("#users")[0]; var m = JSON.parse(data.d); grid.addJSONData(m); } }, error: function() { alert("Loading Failed!"); } }); }, // this is what jqGrid is looking for in json callback jsonReader: { root: "rows", page: "page", total: "total", records: "records", cell: "cell", id: "login", repeatitems: true }, colNames: ['Login', 'First Name', 'Last Name', 'Email', 'Site', 'Role', 'Room', 'UnitID', 'Supervisor', 'Super'], colModel: [ { name: 'login', index: 'login', width: 20 }, { name: 'fname', index: 'fname', width: 20, hidden: true }, { name: 'lname', index: 'lname', width: 60, align: "center", sortable: true, searchoptions: { sopt: ['eq', 'ne']} }, { name: 'email', index: 'email', width: 20, align: "center", sortable: false }, { name: 'site', index: 'site', width: 50, align: "center", sortable: true, searchoptions: { sopt: ['eq', 'ne']} }, { name: 'role', index: 'role', width: 15, align: "center", sortable: true, searchoptions: { sopt: ['eq', 'ne']} }, { name: 'room', index: 'room', width: 30, align: "center", sortable: true }, { name: 'unitid', index: 'unitid', width: 10, align: "center", sortable: false }, { name: 'super', index: 'super', width: 20 }, { name: 'supername', index: 'supername', width: 10, align: "center", sortable: false }, ], pager: "#pageusers", viewrecords: true, caption: "Registered Users", imgpath: 'themes/steel/images', rowNum: 20, rowList: [10, 20, 30, 40, 50], sortname: "pname", sortorder: "desc", showpage: true, gridModel: true, gridToolbar: true, onSelectRow: function(id) { var ret = jQuery("#users").getRowData(id); accpara.id = ret.id; accpara.pname = ret.pname; accpara.pid = ret.pid; accpara.bld = ret.bld; accpara.cname = ret.cname; accpara.amt = ret.amt; accpara.status = ret.status; accpara.notes = ret.notes; accpara.lname = ret.lname; } }); jQuery("#users").navGrid('#pageusers', { view: false, del: false, add: false, edit: false }, {}, // default settings for edit {}, // default settings for add {}, // delete {closeOnEscape: true, multipleSearch: true, closeAfterSearch: true }, // search options {} ); $("#users").setGridWidth(1300, true); $("#users").setGridHeight(500, true); jQuery("#users").jqGrid('filterToolbar'); //----grid code ends here function loadusergrid() { $("#users").setGridParam({ page: 1 }, { pgbuttons: true }, { pginput: true }, { postData: { "site": site} }).trigger("reloadGrid"); } }); when page loads for the 1st time, this works.. now i have 4 drop-downs which filter users. i have written a function which reloads the grid when the dropdown is changed, but it isnt working.. what am i doing wrong here?? when i enable postback for the dropdowns, i get the filtered result. i want to avoid postbacks on my page :). right now i have added just the site dropdown as the filter. once this starts working ill add the remaining 3. firebug shows the ajax call is fired successfully but with an empty sitename. please note that the site dropdown cntains an empty value when page is loaded for the 1st time. thanks in advance

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  • Why after deleting a 110+ GB collection, my /var/lib/mongodb directory still have same size?

    - by tunnuz
    I am having some troubles with MongoDB and space usage. In particular, I once used to have a large collection of about 600 million records totaling 110+ GB on disk. Recently I decided to drop it because the data was outdated, to do so I dropped the collection through rockmongo's web interface. Accordingly, rockmongo doesn't show me the collection anymore, however my disk usage hasn't changed at all. Is there any clean operation which I am not aware of, which must be run in order to synchronize the database with database files on disk? I have tried to perform a "repair" but the system complains that there's not enough space on disk ... that's because it is all used by MongoDB.

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  • SQL Server Snapshot Replication Subscriber (Editable or Read-Only)

    - by NateReid
    I need to create a copy of my SQL 2008 R2 Enterprise database and have it located on the same server as the original. I will be using this second copy of the database as the target of a mostly read-only website. I understand that if I create this copy of the database using snapshot replication that all data changes in the subscriber database will be overwriten in the event of the next replication. The web application will try to write to this database to record login attempts, etc and will fail if its source database is read-only. In my case I do not need to keep these auditing records and they can therefore be overwriten each time a new snapshot is applied. My question is whether SQL Server forces the subcriber database to be read-only and is there any way around this? Thank you, Nate

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  • How do I set up failover for a single web server using two ISPs?

    - by Travis
    I have one web server and two WAN connections (1 cable, 1 DSL). DNS is run offsite, and points to the IP address assigned by one of the ISPs. How can I have the second connection take over when the primary one fails? I have seen that it is possible to have two A records, each pointing to a different IP, but it has several problems. What's the real solution to this? I imagine this is a very common issue. Thanks in advance!

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  • merge values from excel file into .html file opened in word 2007

    - by Kelbizzle
    I have this newsletter I've written. I want to be able to use the values in the rows and some how have them merged into this html file I have opened in word. Sort of like a mail merge. In the newsletter I have 3 urls that look like: www.mydomain.com/php?id= I want to be able to replace all of the urls for all 230 records in the excel file. With something like: www.mydomain.com/?id=$id Where $id would get replaced with the id of the record. And the same goes for the rest of the rows like $firstname $lastname $email $phone number Is there a simple way to do this?

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  • www a-record vs cname-record

    - by Sorin Buturugeanu
    Hi! I have a website that I will be hosting DNS for (testing purposes at first and then it will have some limited traffic). I have set up DNS so that site.tld has an A record to the actual IP but I don't know what to do about www.site.tld. Both site.tld and www.site.tld will point to the same server / application so my logic tells me to add a cname record so that www.site.tld becomes an alias for site.tld, BUT, I've been checking my settings with intodns.com and if I only add a CNAME for the www.site.tld it gives me the following error: ERROR: I could not get any A records for www.cexa.ro! (the error clears once I do an A record for www.site.tld to point to the actual IP) I don't know if there is a "rule" that "www." should always be an A record even though it's actually pointing to the same IP / application. Thanks for helping me understand this!

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  • Software available for singing "lessons" via computer microphone?

    - by drozzy
    Looking for a software to help my friend learn to sing. Can't seem to find anything on googles. Does there exist software (preferably downloadable and from this century!) that records one's voice and then analyzes it to see how "accurate" it was. It would be great if it also had some kind of "lessons" of some sort, and not simply sound recorder that shows waveforms. I can't imagine it would be so hard to implement, and there probably is one out there - I just can't find it. Any recommendations are welcome. Thanks.

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  • Setting up Ubuntu Server on Amazon EC2 for hosting multiple domains with wildcard subdomains

    - by Ashish Kumar
    I'm trying to set up multiple domains on my Amazon EC2 micro instance running Ubuntu Server 12.04. I installed Apache correctly and set up virtual hosts but having problems with wildcard subdomains. This is what my httpd.conf file looks like NameVirtualHost *:80 <VirtualHost *:80> UseCanonicalName Off VirtualDocumentRoot /home/username/domains/%0/html/ </VirtualHost> My DNS records (on Amazon Route 53) are: domain.tld A 1.2.3.4 *.domain.tld A 1.2.3.4 If i create a test.domain.tld directory with the html subdirectory, it works fine. But what I want to do is to redirect *.domain.tld to domain.tld in case there is no directory for the sub-domain accessed. I would also like www.domain.tld to redirect to domain.tld. The system should also work if I decide to host another website, example.com, on the server. I tried Googling a lot but without any luck. Suggestions?

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  • DNS management for WHMCS / cPanel?

    - by RD.
    I currently have WHMCS (www.whmcs.com) that I use for the billing system for my hosting company. It integrates with cPanel and WHM. I want to be able to allow clients to: Change MX Records Change DNS info (CNAME, A Record etc) 1 can be done in cPanel. But 2 not. So my questions are: 1. Is there a program/application available that will give clients access to this? I.e. So they can change their DNS info? 2. How do other companies do it?

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  • Predictive vs Least Connection Load Balancing Techniques

    - by Mani
    I have a windows based desktop application that communicates via TCP to the application servers. (windows 2003). No sticky sessions between client calls. We have exactly 2 servers to load balance and we are thinking to use a F5 hardware NLB. The application is a heavy load types, doing not much bussiness logic in the services but retrieving quite a big amount of data at most of the times. May be on an average 5000 to 10000 records at all times. Used mainly for storing and retirieving data and no special processing of data or calculations running on the server side. I am favouring 'predictive' considering my services take a while at times to return data and hence tracking the feedback would yield some better routing as in predictive. I am not sure if the given data is sufficient enough to suggest some ideas but considering these, what would be some suggestions\things to consider\best between Predictive and Least Connections ? Thanks.

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  • Failed reverse DNS and SPF only when using Thunderbird!

    - by TruMan1
    I have a reverse DNS and SPF records correctly setup for my mail server. Sending webmail from it works perfect. The problem is when Thunderbird sends out emails, it is using the client's IP address for the hostname. I have SMTP authentication and specified my mail server's as the outgoing SMTP. Mail is being sent, but it is not "signing" the email with the mail server's IP address.. it is using the client's. Is there any way to fix this? This is the spam error I get when sending from Thunderbird: Spam: Reverse DNS Lookup, SPF_SoftFail

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  • Python: Improving long cumulative sum

    - by Bo102010
    I have a program that operates on a large set of experimental data. The data is stored as a list of objects that are instances of a class with the following attributes: time_point - the time of the sample cluster - the name of the cluster of nodes from which the sample was taken code - the name of the node from which the sample was taken qty1 = the value of the sample for the first quantity qty2 = the value of the sample for the second quantity I need to derive some values from the data set, grouped in three ways - once for the sample as a whole, once for each cluster of nodes, and once for each node. The values I need to derive depend on the (time sorted) cumulative sums of qty1 and qty2: the maximum value of the element-wise sum of the cumulative sums of qty1 and qty2, the time point at which that maximum value occurred, and the values of qty1 and qty2 at that time point. I came up with the following solution: dataset.sort(key=operator.attrgetter('time_point')) # For the whole set sys_qty1 = 0 sys_qty2 = 0 sys_combo = 0 sys_max = 0 # For the cluster grouping cluster_qty1 = defaultdict(int) cluster_qty2 = defaultdict(int) cluster_combo = defaultdict(int) cluster_max = defaultdict(int) cluster_peak = defaultdict(int) # For the node grouping node_qty1 = defaultdict(int) node_qty2 = defaultdict(int) node_combo = defaultdict(int) node_max = defaultdict(int) node_peak = defaultdict(int) for t in dataset: # For the whole system ###################################################### sys_qty1 += t.qty1 sys_qty2 += t.qty2 sys_combo = sys_qty1 + sys_qty2 if sys_combo > sys_max: sys_max = sys_combo # The Peak class is to record the time point and the cumulative quantities system_peak = Peak(time_point=t.time_point, qty1=sys_qty1, qty2=sys_qty2) # For the cluster grouping ################################################## cluster_qty1[t.cluster] += t.qty1 cluster_qty2[t.cluster] += t.qty2 cluster_combo[t.cluster] = cluster_qty1[t.cluster] + cluster_qty2[t.cluster] if cluster_combo[t.cluster] > cluster_max[t.cluster]: cluster_max[t.cluster] = cluster_combo[t.cluster] cluster_peak[t.cluster] = Peak(time_point=t.time_point, qty1=cluster_qty1[t.cluster], qty2=cluster_qty2[t.cluster]) # For the node grouping ##################################################### node_qty1[t.node] += t.qty1 node_qty2[t.node] += t.qty2 node_combo[t.node] = node_qty1[t.node] + node_qty2[t.node] if node_combo[t.node] > node_max[t.node]: node_max[t.node] = node_combo[t.node] node_peak[t.node] = Peak(time_point=t.time_point, qty1=node_qty1[t.node], qty2=node_qty2[t.node]) This produces the correct output, but I'm wondering if it can be made more readable/Pythonic, and/or faster/more scalable. The above is attractive in that it only loops through the (large) dataset once, but unattractive in that I've essentially copied/pasted three copies of the same algorithm. To avoid the copy/paste issues of the above, I tried this also: def find_peaks(level, dataset): def grouping(object, attr_name): if attr_name == 'system': return attr_name else: return object.__dict__[attrname] cuml_qty1 = defaultdict(int) cuml_qty2 = defaultdict(int) cuml_combo = defaultdict(int) level_max = defaultdict(int) level_peak = defaultdict(int) for t in dataset: cuml_qty1[grouping(t, level)] += t.qty1 cuml_qty2[grouping(t, level)] += t.qty2 cuml_combo[grouping(t, level)] = (cuml_qty1[grouping(t, level)] + cuml_qty2[grouping(t, level)]) if cuml_combo[grouping(t, level)] > level_max[grouping(t, level)]: level_max[grouping(t, level)] = cuml_combo[grouping(t, level)] level_peak[grouping(t, level)] = Peak(time_point=t.time_point, qty1=node_qty1[grouping(t, level)], qty2=node_qty2[grouping(t, level)]) return level_peak system_peak = find_peaks('system', dataset) cluster_peak = find_peaks('cluster', dataset) node_peak = find_peaks('node', dataset) For the (non-grouped) system-level calculations, I also came up with this, which is pretty: dataset.sort(key=operator.attrgetter('time_point')) def cuml_sum(seq): rseq = [] t = 0 for i in seq: t += i rseq.append(t) return rseq time_get = operator.attrgetter('time_point') q1_get = operator.attrgetter('qty1') q2_get = operator.attrgetter('qty2') timeline = [time_get(t) for t in dataset] cuml_qty1 = cuml_sum([q1_get(t) for t in dataset]) cuml_qty2 = cuml_sum([q2_get(t) for t in dataset]) cuml_combo = [q1 + q2 for q1, q2 in zip(cuml_qty1, cuml_qty2)] combo_max = max(cuml_combo) time_max = timeline.index(combo_max) q1_at_max = cuml_qty1.index(time_max) q2_at_max = cuml_qty2.index(time_max) However, despite this version's cool use of list comprehensions and zip(), it loops through the dataset three times just for the system-level calculations, and I can't think of a good way to do the cluster-level and node-level calaculations without doing something slow like: timeline = defaultdict(int) cuml_qty1 = defaultdict(int) #...etc. for c in cluster_list: timeline[c] = [time_get(t) for t in dataset if t.cluster == c] cuml_qty1[c] = [q1_get(t) for t in dataset if t.cluster == c] #...etc. Does anyone here at Stack Overflow have suggestions for improvements? The first snippet above runs well for my initial dataset (on the order of a million records), but later datasets will have more records and clusters/nodes, so scalability is a concern. This is my first non-trivial use of Python, and I want to make sure I'm taking proper advantage of the language (this is replacing a very convoluted set of SQL queries, and earlier versions of the Python version were essentially very ineffecient straight transalations of what that did). I don't normally do much programming, so I may be missing something elementary. Many thanks!

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  • Load balancing SMTP in a way that doesn't hide the source IP address

    - by makerofthings7
    I need to load balance SMTP to handle some applications that don't know how to use MX records. I set up a Netscaler using the TCP option on port 25 and now Exchange sees the source IP as that of the DMZ of the Netscaler for every connection, not the client. Obviously this prevents RBLs, Whitelists, and all other IP-based reputation to fail. It also make it impossible to whitelist a trusted IP for anonymous relay. Question How should I configure the NetScaler (or Windows Load Balancing) so that I can allow load balancing yet still maintain visibility of the source IP?

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  • Change my MX record on my server to google MX?

    - by Dejan.S
    Hi. I got a windows server 2008 where I host a site, now I decided to have the email on google apps. I did add the MX records I get from them to my DNS settings on the server but with no luck. I recently started doing server stuff so I did like this. Server Manager / Roles / DNS Server / DNS / SERVERNAME / MYDOMAIN / Forward Lookup / New MX Host or child domain: What goes here? FQDN: here is my domain name, i think because I named the ns my domain? FQDN MX: here is the google MX record I got from them MSP: 10 I have no Idea where I go wrong but I thought I would ask you guys if any of you can maybe give me some tips on what to look for or any newbee mistake I do that you see from this little info. I really appreciate all help I could get on this.

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  • How to alter mail-from postfix?

    - by Simon
    Hi all, do anyone know how to alter the mail-from of a postfix mail server? Example, I have a postfix mail server which sends mail for the domain example.org. When a linux user, whose account is user.example.org (mapped in postfix/virtual to [email protected]), try to send an email, its mail from is [email protected]. HELO hostname: server.hostname.org Source IP: one ip here mail-from: [email protected] Problems: user.example.org instead of just user. server.hostname.org instead of just example.org. Desired mail-from: [email protected]. This is causing me problems with SPF records for example (example.org differs from server.hostname.org)... any idea of what can be the problem? Thanks in advance, Simon.

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