repopulate

a largetable while the very most of the buffers of that table in cache. During truncates thesession have to a local checkpoint and During this process, the session may waitfor ' local write ' wait. basically ' localwrite ' Wait indicates that the session is waiting for its own write operation. Occurs when there is a serious problem with the disk ( for example , a RAID 5 disk crash , or a disk controller error ), which rarely occurs in a normal system, in TRUNCATE A large table While this table

)); } //found 16 of the appropriate free_listMy_free_list = Free_list +Freelist_index (n); Result= *my_free_list; if(Result = =0){ //if no available free_list are found, prepare to repopulate free_list void*r =Refill (ROUND_UP (n)); returnR; } *my_free_list = result--Free_list_link;//here is the key to understanding, in fact, the result has been pointed to the first available block, the first byte of the block is the next available block is th

ApShot.dbo.Person WHERE Personld 3. Undo DeleteIf you delete a database object from the source database, you can script it and from the snapshot databaseRe-create it. If the object is a table, you can repopulate the table with the method previously used to undo the deletion.--inadvertant deletion of the person table use Smallworks GODROP TABLE dbo. Person--Recreate the person TableUse Smallworks GOCREATE TABLE dbo. The person (personld int is not NUL

Select a node to get the query Condition property and event property name Description Selecednode selected node level node depth from 0 Start event name Description AfterSelect node selected after the TreeView control is represented by nodes, important properties and events The Nodes property SelectedNode property AfterSelect event displays data that matches the criteria of the selected node the first method: (recommended) The second method combines query criteria to filter requery data directly

manifest file changes (even if the comment changes are updated, #VERSION 1.0), and the cache Changes to the resource file in the manifest do not trigger the update.2. Manual update: update the cache programmatically, call Applicationcache.update () first, and this action attempts to update the user's cache (provided the cache manifest file has changed). Then, when Applicationcache.status is in the Updateready state, call Applicationcache.swapcache () to replace the original cache with the new c

: " runat="server"> " runat="server "> "> "> " runat="server"> " runat="server "> "> "> " runat="server"> " runat="server "> "> "> C # VB JScript In this example, the server control is not required to substitute the value into the result HTML sent back to the client. This method applies in many other cases, even in th

side (mastering JavaScript), reducing the pressure on the server.2, do not use unnecessary ViewStateBy default, ASP. NET has ViewState (view state) enabled for all server control. But ViewState needs to save some information on the client, which can result in a performance drain. When you must use server control, you can consider prohibiting viewstate.Save the server control view state only when necessary. Automatic view state Management is a feature of server controls that enable server contro

specified updates, and repopulate the application cache. Therefore, two loads are required to provide new content to the user. The first time is to get a new app cache, and the second is to refresh the page content.To avoid the hassle of reloading two times, you can set up listeners to listen for Updateready events when the page loads. Check If a new cache is available on page load. Window.addeventlistener (' load ', function (e) { Window.ap

has the same cache information.The specific update operation is actually done by the controller. The controller sends a UPDATEMETADATA request to a specific broker in a certain scenario to order the brokers to update their respective caches, which, once they receive the request, begin a full-scale update-that is, emptying all the current cache information, Use the data in the Updatemetadata request to repopulate the cache.4. When does the cache updat

unless you have a specific reason to turn it offDisabling buffering of Web forms pages can result in a lot of performance overhead.21. Save the server control view state only when necessary　Automatic view state management is a feature of server controls that enable server controls to repopulate their property values on round trips (you do not need to write any code). However, because the view state of the server control is round-tripping to the serve

detailed exception, which is tested only to print detailed stack tracks, and the other way is to only output error messages. 2. The difference between throw E and Throwe.fillinstacktrace () The former outputs a detailed error code line, the latter only outputs the location where the exception was thrown, does not print out the location of the error code line, that is, the e.fillinstacktrace () local line of code, so relatively, if you want to clearly throw the error message should use the forme

returned to the free list, and then by the free list is recycled.(3) Refill ()This function is very important, so you have to come up with a separate introduction. When there are no chunks available in the free list, this function is called to repopulate a portion of the space for it. The new space is taken from the memory pool (completed by Chunk_alloc). By default, 20 new chunks are obtained, and if there is insufficient memory pool space, the numb

memory block and the small memory block, the memory block which is larger than __max_bytes is the management category of the first-level space Configurator.2. The bottom of the two-level space Configurator is managed by a free list (hash bucket). One of the enumeration variable __align values (8) is the interval that represents the hash bucket division.3. The two-level space Configurator will have a corresponding algorithm to calculate the most appropriate memory block and number of memory bloc

result.try {result = 100/num; 　　} catch (Exception e) {result = 0; 　　}//... to this. 　　if (num! = 0) result = 100/num; else result = 0;19. String concatenation using the HttpResponse.Write methodThis method provides very efficient buffering and connection services. However, if you are performing a wide range of connections, use multiple Response.Write calls. The technique shown in the following example is faster than using a single call to the Response.Write method to connect strings.Response.W

read () throws IOException { synchronized (lock) { ensureopen (); for (;;) { if (Nextchar >= nchars) { fill (); if (Nextchar >= nchars) return-1; } if (SKIPLF) { SKIPLF = false; if (cb[nextchar] = = ' \ n ') { nextchar++; Continue; } }

several things to note about this pattern: 　　 Some values (for example, CacheKey, CacheItem, and cache duration) are defined once and are defined once. You can skip caching as needed-for example, after registering a new customer and redirecting to the customer list, it may be best to skip the cache and repopulate the cache with the latest data, including the newly inserted customer. Caching can only be accessed once. This approach improves performan

exceptions; only two of them can print out detailed stack tracks, except that the error message is output in other ways. 2. The difference between throw E and Throwe.fillinstacktrace () The former outputs a detailed error code line, which outputs only the position where the exception was thrown, and does not print out the location of the error code line, that is, the E.fillinstacktrace () Location code line; So, relatively speaking, you should use the former if you want to clearly throw an erro

, CacheItem, and cache duration) are defined once and defined only once. Caching can be skipped as needed-for example, when registering a new customer and redirecting to the customer list, it might be best to skip the cache and repopulate the cache with the latest data, which includes the newly inserted customer. The cache can only be accessed once. This practice improves performance and ensures that nullreferenceexceptions does not occur beca

: SortBy optional, specified order, must be a function. The returned value is the sorted array itself. If you call the method without using parameters, the elements in the array are sorted alphabetically. To be more precise, sorting is done in the order of character encoding. To do this, you should first convert the elements of the array into strings (if necessary) for comparison. If you want to sort by other criteria, you need to provide a comparison function that compares two values, and then

values (2, ' B ') | | mysql-bin.000033 | 674 | Xid | 1 | 705 | COMMIT/* XID=12 * | | mysql-bin.000033 | 705 | Rotate | 1 | 752 | mysql-bin.000034;pos=4 | +------------------+-----+----------------+-----------+-------------+------------------------------------------ -------------------------+ rows in Set (0.00 sec) Previous_gtids_log_event When Gtid mode is turned on, there is a previous_gtids_log_event event at the beginning of each binlog, and its value is the previous_gtids_log_event+gtid