netscout pfs

the same page, or a few pages, become hot page, usually on the OLTP system appears more. 3, this bottleneck can not be solved by improving the hardware configuration, only by modifying the table design or business logic, so that the changes scattered, improve concurrency.Mitigation Methods for Hot page:(1), for a data column to build a clustered index, rather than the identity of the field, the same time the insertion has the opportunity to spread to different pages.(2) If you must build a clus

of samples? Or full scan? The function Execution Mode determines the scanning level to obtain the statistical data used by the function. Mode is specified as LIMITED, SAMPLED, or DETAILED. This function traverses the page chains of allocation units, which constitute a table orIndex. Sys. dm_db_index_physical_stats only requires an intention to share (IS) Table lock and ignores the mode in which it runs. For more information about locking, see lock mode.The LIMITED mode runs the fastest, and the

650) this. width = 650; "src =" http://www.bkjia.com/uploads/allimg/131227/05062443b-0.png "title =" GRE Over ipsec ).png "/> GRE Over IPSec, as the name suggests, is to establish a GRE tunnel on the IPSec interface, while an IPSec Encryption mode is tunnel mode to encrypt the network segment to the network segment ), this is the GRE tunnel built on the IPSec encrypted CIDR block. ======================================== R0 Configuration: ============================================ Crypto isa

is not traversed, recursively traverse T;Traverse all edges starting from the T node:If d [s] [I]> W + d [T] [I]:Update d [s] [I] = W + d [T] [I], p [s] [I] = E;}The complexity of this algorithm is ve (applicable to negative edges ). The shortest path of Euclidean NetworksEuclidean networks refers to a network with many points on the plane. The weights between points are the Geometric Distance between the two points.Generally, Euclidean networks is relatively large, that is, there are many poin

BY c2,c3 ORDER BY(getdate())) as numfrom duplicate_col)delete tmp where num > 1select * from duplicate_col 3. Delete massive dataWhen deleting massive data, if you want to improve performance, you need to consider an important factor: How to Reduce log operations? 1. delete a full tableThere are usually three ways to delete a full table: Drop, truncate, delete(1) Drop/truncateDrop and truncate are DDL operations, and the log volume is very small (only records on the data page are recycled, and

(page 2) (approximately 4 GB space ), the next SGAM page appears on every 511 230 pages after the first SGAM page (page 3. The page where the page number of each database file is 0 is the file header page, andEach file has only one page (the file header page with the page number 0). Page 0 is the header Page, and Page 1 is the Free Space Page (PFS ). In SQL Server, the first eight data pages are fixed, so SQL server can quickly confirm which zones ar

Net-LAN1ID-type = ipv4_addr_subnetNetwork = 192.168.55.0Netmask = 255.255.255.0 [Default-Main-mode]Doi = IPSecExchange_type = id_protTransforms = 3des-sha [Default-quick-mode]Doi = IPSecExchange_type = quick_modeSuites = QM-ESP-AES-SHA-PFS-SUITE 3. # $ OpenBSD: VPN-east.conf, V 1.11 2001/04/09 23:27:29 nick1 exp $# $ EOM: VPN-east.conf, V 1.12 2001/04/09 22:08:30 nick2 exp $ # A Configuration sample for the isakmpd ISAKMP/Oakley (aka Ike)Dae

the C # program for Interface Conversion:Using system. runtime. interopservices;// Declare a COM interface imediacontrol[GUID ("56a868b1-0ad4-11ce-b03a-0020af0ba770 "),Interfacetype (cominterfacetype. interfaceisdual)]Interface imediacontrol // no base interface is listed here{Void run ();Void pause ();Void stop ();Void getstate ([in] int mstimeout, [out] Out int PFS );Void renderfile ([IN, financialas (unmanagedtype. BSTR)] string strfilename );Void

through Tunnel. In this way, only private network traffic is encrypted, the defined map should be applied to the Tunnel port.========================================================== ======================================R1Crypto isakmp policy 1Encr 3desAuthentication pre-shareGroup 2Crypto isakmp key 6 cisco address 30.1.1.2!Crypto ipsec transform-set ah-sha-hmac esp-3des!Crypto map mymap 1 ipsec-isakmpSet peer 30.1.1.2Set transform-setSet pfs grou

algorithm using Elliptic curve (ECC) has the advantage of being able to achieve the same security level as RSA with a smaller prime number (256 bits). The disadvantage is that the algorithm is complex and the history of the key exchange is not long, and it has not been tested for long time security attack. ECDH: PFS is not supported, security is low, and false start cannot be implemented. DHE: ECC is not supported. Consumes CPU resources very

declared with MIDL and the same interface declared with C # (note that these methods use the COM error handling method ). Below is the C # program for Interface Conversion: Using System. Runtime. InteropServices;// Declare a COM interface IMediaControl[Guid ("56A868B1-0AD4-11CE-B03A-0020AF0BA770 "),InterfaceType (ComInterfaceType. InterfaceIsDual)]Interface IMediaControl // no base interface is listed here{Void Run ();Void Pause ();Void Stop ();Void GetState ([In] int msTimeout, [Out] out int

declared with MIDL and the same interface declared with C # (note that these methods use the COM error handling method ). Below is the C # program for Interface Conversion: Using System. Runtime. InteropServices;// Declare a COM interface IMediaControl[Guid ("56A868B1-0AD4-11CE-B03A-0020AF0BA770 "),InterfaceType (ComInterfaceType. InterfaceIsDual)]Interface IMediaControl // no base interface is listed here{Void Run ();Void Pause ();Void Stop ();Void GetState ([In] int msTimeout, [Out] out int

and consume CPU computational resources. RSAis currently the only algorithm that can be used for both key exchange and certificate signing.DH: diffie-hellman key exchange algorithm, the birth time is earlier (1977), but 1999 is not public. The disadvantage is the comparison of consumption CPU performance.ECDHE: An algorithm using an elliptic curve () has the advantage of being ECC DH able to achieve RSA the same level of security with a smaller prime number (256 bits). The disadvantage is that

enable this feature:on; ssl_stapling_file ocsp.staple;2.5 False StartTypically, the application tier data must wait until the full handshake is complete before it can be transferred. This is actually a waste of time, that can be similar to TFO, in the second phase of the full handshake to send the application data together? Google has proposed false start to implement this function. The reference https://tools.ietf.org/html/draft-bmoeller-tls-falsestart-00 is described in detail.A simple genera

Configuration guide:You need to configure an encryption plan that complies with the PFS specification, which is currently recommended:ECDHE-RSA-AES128-GCM-SHA256:ECDHE:ECDH:AES:HIGH:!NULL:!aNULL:!MD5:!ADH:!RC4TLS1.2 is required to be enabled in the service-side TLS protocol and is currently the recommended configuration:TLSv1 TLSv1.1 TLSv1.21.Nginx Certificate ConfigurationUpdate the Nginx root directory under the conf/nginx.conf file as follows:serve

physical storage space for new data rows is done through PFS pages. The management algorithm of the PFS page disperses the insert operation to avoid generating data hotspots as much as possible. When designing application systems and databases, avoid creating primary keys on naturally growing columns, which can result in hot-spot data happening. 　　4. Less data types When designing a table, use as little

physical storage space for new data rows is done through PFS pages. The management algorithm of the PFS page disperses the insert operation to avoid generating data hotspots as much as possible. When designing application systems and databases, avoid creating primary keys on naturally growing columns, which can result in hot-spot data happening. 　　4. Less data types When designing a table, use as little

, you know, called the District, the district refers to 8 physically contiguous pages of the collection, if the 8 physically contiguous pages belong to the same table, then this zone is called the Unified Zone, if the 8 pages belong to at least two different tables. This area is called a mixing zone.Although each page is 8KB, it does not mean that 8KB is used to hold specific data, and each page has a 96-byte header at the beginning to store system information about the page, such as page number

objects, and pages in a unified area must be assigned to a database object.4. When SQL Server requests space for a database object, it needs to use the information of the GAM,SGAM,PFS system page, and when the space is allocated, it also maintains the interest of the GAM,SGAM,PFS system page.Above I briefly listed a few points, more detailed information you can refer to the following link information:Http:

to incrementally back up partitions that have changed data Lop_begin_xact Transaction start Lop_modify_row Lcx_heap Modify a row of records in a heap table Lop_prep_xact Prepare to start the database Lop_commit_xact Commit a transaction Lop_modify_row Lcx_boot_page Modify the Database startup page Lop_modify_header Lcx_pfs Modify page header informat