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else: form = SnippetForm(instance=snippet) return render_to_response('cab/edit_snippethtml', { 'form': form }) edit_snippet = login_required(edit_snippet) To tell a ModelForm subclass that you d like it to edit an existing object, you simply pass that object as the keyword argument instance; the form will handle the rest And note that because the Snippet already has an author, and that value won t be changing, you don t need to use commit=False and then manually save the Snippet The form won t change that value, so you can simply let it save as is Now you can add a URL pattern for it First you change the import line in cab/urls/ snippetspy to also import this view: from cabviews.

It is also important for the Applications DBA to monitor the memory usage of the servers. The threshold for memory utilization is also site specific. The following script will monitor server memory utilization: #Script used to monitor server memory utilization #Threshold is the maximum percentage of memory used THRESHOLD=$1 TMPFILE=/tmp/tmp_mem.txt LOGFILE=/tmp/memory_utilization.log HOSTNAME=`hostname` sar -r 2 2 > $TMPFILE MEM_USAGE=`tail -1 $TMPFILE | awk '{ print $4 }'` if [ $MEM_USAGE -gt $THRESHOLD ] then echo "$HOSTNAME - Server Memory utilization High - $MEM_USAGE" > $LOGFILE exit 1 else exit 0 fi Like high CPU utilization, high memory consumption is sometimes a symptom of underlying performance issues or a long running job. If your server frequently experiences low memory, it is possible that additional memory is required. Additional information for resolving high memory consumption is provided in 4 of this guide.

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This is a pointer; the object will be dynamically created. Object-oriented languages usually reserve a keyword such as new to instantiate a new object. That allocated memory is then passed to a constructor function you write that initializes the object. In C you will create your own constructors that allocate and initialize memory, such as this: GaimBlistNode *gaim_blist_node_new() { GaimBlistNode *node = (GaimBlistNode*)g_malloc(sizeof(GaimBlistNode)); node->type = GAIM_BLIST_OTHER_NODE; node->prev = NULL; node->next = NULL; node->parent = NULL; node->child = NULL; node->settings = NULL; node->ui_data = NULL; node->flags NULL; return node; } This constructor allocates memory for the new GaimBlistNode, sets most of its members to NULL, but its type to GAIM_BLIST_OTHER_NODE, indicating that it s not one of the already known node types. Note that the function is namespaced, too, with the name of the object class preceding the relevant part of the function name. Now consider what happens if you call GaimBlistNode *node = gaim_blist_node_new(); This call will allocate enough memory to store a GaimBlistNode, and the node variable will be set to the memory location where the object is stored. The object will be initialized to a default value. We can now call methods of this object using node as an instance. In object-oriented languages, the methods are treated as elements of the instance. You would execute something like this: node->remove_setting("buddy_icon"); Although this is possible with C, it is much simpler to bind functions to objects lexically, as you did with the constructor. GaimBlisitNode s remove_setting function (which removes a setting from the node) looks like this: void gaim_blist_node_remove_setting(GaimBlistNode *node, const char *key) { g_return_if_fail (node != NULL); g_return_if_fail (node->settings != NULL); g_return_if_fail (key != NULL); g_hash_table_remove(node->settings, key)); gaim_blist_schedule_save (); }

snippets import add_snippet, edit_snippet and then you add the URL pattern: url(r'^edit/( P<snippet_id>\d+)/$', edit_snippet, name='cab_snippet_edit'), Because the form for both the edit_snippet view and the add_snippet view will have the same fields, you can simplify the templating a bit by using only one template and passing a variable that indicates whether you re adding or editing (so that elements like the page title can change accordingly) So let s change the add_snippet view s final line to pass an extra variable called add, set its value to True, and change the template name to cab/snippet_formhtml: return render_to_response('cab/snippet_formhtml', { 'form': form, 'add': True }) Then you can change the same line in the edit_snippet view to use cab/snippet_form html and set the add variable to False: return render_to_response('cab/snippet_formhtml', { 'form': form, 'add': False }) Now you can simply have one template cab/snippet_form.

The first three instructions check to make sure the provided arguments are valid. This is akin to the assert command in some object-oriented languages. The call to g_hash_table_remove() actually removes the setting, and then gaim_blist_schedule_save() saves the change to disk. This function is called like this: gaim_blist_node_remove_setting(node, "buddy_icon");;

Filesystem monitoring should focus on the amount of free space available. If database datafiles are set to AUTOEXTEND, the filesystem containing them should have sufficient free disk space to allow for extents.

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