implementing the database system

... Setting up the HACCP system documentation • The Company’s policy on food safety • The Company’s goals of food safety • The procedures required by the HACCP standard • The records required by the HACCP ... safety management system Implementing the Project Plan Implementation steps: No Steps Step 1: to find out the scopes of application of the HACCP system Description - Understanding the meaning of ... 8/2008 The project goal is the HACCP conformity certification by an independent Assessment Organization to the company's products and its production system - The cost of the project includes the...

Ngày tải lên: 29/10/2016, 08:23

... this watermark The Worlds of Database Systems 1.1 The Evolution of Database Systems 1.1.1 Early Database Management Systems 1.1.2 Relational Database Systems ... to corrupt the data accidentally 1.1.1 Early Database Management Systems The first commercial database management systems appeared in the late 1960's These systems evolved from file systems, which ... relational systems generally use the SQL language for representing requests from the client to the server The database server then sends the answer, in the form of a table or relation, back to the client...

Ngày tải lên: 24/12/2013, 12:17

... have the same value in their Year cornponents, then these two tuples must have the same values in their length cornponents, the same values in their f ilmType components, and the same values in their ... of their declarations the keyword inverse and the name of the other relationship If the other relationship is in some other class, as it usually is, then we refer to that relationship by the ... and the labels on these arcs tell" what role the node is playing with respect to the node at the tail of the arc In all the other models data has a fised schema, separate from the data and the...

Ngày tải lên: 24/12/2013, 12:17

... to the node for the S-pair Then the result will be an instance of semistructured data that has essentially the same structure as the document Gnfortunately, the relationship doesn't go the other ... of C the condition C is true, then t is one of the tuples that appear in the result of uc(R); otherwise t is not in the result Example 5.3: Let the relation Movie be as in Fig 5.3 Then the wlue ... we take the product of the relations U and V and then apply the condition that appeared in the theta-join The rewriting rules mentioned in this section are the only "redundancies" among the operations...

Ngày tải lên: 24/12/2013, 12:17

... available then the best the system can is retrieve all the movies of that year and cheek through them for the giren title If: as is often the case, the key for the multiattribute index is really the ... choosing, rather than use the names that come out of the query defining the view may specify the attributes of the view by listing them, surrounded by parentheses, after the name of the view in the CREATE ... Find the countries of the ships involved in the battle Print the country with the most ships sunk and the country with the most ships damaged c) Ask the user for the name of a class and the other...

Ngày tải lên: 24/12/2013, 12:17

... happens if there is a failure after line (14); perhaps the computer fails or the network connecting the database to the processor that is actually performing the transfer fails Then the database ... changes to the database If the transaction aborts, then (without precautions) it is possible that these changes were seen by some other transaction The most common solution is for the database system ... rule heads then one of these relations is the answer to the query, while the others assist in the definition of the answer We must designate ~vhich relation is the intended ansn-er to the query,...

Ngày tải lên: 21/01/2014, 18:20

... used by a database system must have a schema, which is stored by the database The schema includes the names and data types of fields in the record, and their offsets within the record The schema ... (b) An identifier for the disk or other device on which the block is located, (c) The number of the cylinder of the disk, (d) The number of the track within the cylinder (if the disk has more than ... containing the block move under the disk head as the entire disk assembly rotates The time taken between the moment at which the command to read a block is issued and the time that the contents of the...

Ngày tải lên: 21/01/2014, 18:20

... of the record and T e place the new record in that bucket If there is room in v the block for the bucket then there is nothing more to The problem occurs when there is no roon: in the bucket There ... find room for the inserted record in the block at hand, then we simply slide the records within the block and adjust the pointers in the offset table The new record is inserted into the block, and ... having to retrieve the block containing the record The fact that K exists in the dense index is enough to guarantee the existence of the record with key I( On the other hand, the same query, using...

Ngày tải lên: 21/01/2014, 18:20

... jewelry Starting at the root, since the salary is at least $150# we go to the right There we colnpare the age 35 with the age 47 at the node which directs us to the left .It the third level we ... Whether the set version or the bag version is wanted, the algorithms are essentially the same as that of Section 15.4.3, except that the way we handle the copies of a tuple t at the fronts of the ... (a) Find the least value y of the join attributes Y that is currently at the front of the blocks for R and S (b) If y does not appear at the front of the other relation, then remove the tuple(s)...

Ngày tải lên: 21/01/2014, 18:20

... in the absence of any other transactions or system errors and it starts with the database in a consistellt state then the database is also in a consistent state when the transaction ends the database ... the join of two relations (from Section 16.4.4) to the twvo relations that are the join of the R's and the join of the S's, the estimate will be the product of the two estimates, divided by the ... .&bolathe y ,the StarsIn from the outer query is joined n-ith the result of the subquery The selection from the subquery is then applied to the product of Stars In and the result of the subquery;...

Ngày tải lên: 21/01/2014, 18:20

... reconstruct the database from the log if: a) The log were on a disk other than the disk(s) that hold the data, b) The log xvere never thrown away after a checkpoint, and c) The log were of the redo or the ... database at the beginning of the dump has values (1.2.3, A), and the database at the end of the dump has values (5.7.6,4) the copy of the database in the archie has values (1,2,6,4) a database state ... from the archive (a) Find the most recent full dump and reconstruct the database from it (i.e., copy the archise into the database) (b) If there are later incremental dumps, modify the database...

Ngày tải lên: 21/01/2014, 18:20

... any of them to the terms of the source Of course the wrapper lnust then communicate the result to the mediator just as a wrapper in a \{-arehouse system cornrnunicates with the warehouse In the ... transactions (whether from the saga in question or any other saga or transaction that may legally execute on the database) then the same database states result from running the sequences Bl Bz ... to its sources The mediator then synthesizes the answer to the user's query from the responses of those sources, and returns the answer to the user We shall introduce each of these approaches...

Ngày tải lên: 26/01/2014, 15:20

... %rehouse Database Database address 579-580, 582 Database administrator 10 Database element 879, 957 Database management system 910 Database programming 1, 15 17 Database schema See Relational database ... queries For the data cube, the vie~vswe n-ould choose to materialize xi11 typically be aggregations of the full data cube The coarser the partition implied by the grouping, the less space the materialized ... instance, if the document has 1000 word occurrences, two of which are "database. " then the doculllent ~vould placed a t the ,002 coordinate in be the dimension cor~espondingto "database. " By...

Ngày tải lên: 26/01/2014, 15:20

... %rehouse Database Database address 579-580, 582 Database administrator 10 Database element 879, 957 Database management system 910 Database programming 1, 15 17 Database schema See Relational database ... instance, if the document has 1000 word occurrences, two of which are "database. " then the doculllent ~vould placed a t the ,002 coordinate in be the dimension cor~espondingto "database. " By ... to be useful unless the set of items inrrolved has high support The reason is that if the support is low, then the number of instances of the rule is not large, which limits the benefit of a strategy...

Ngày tải lên: 26/01/2014, 15:20

... either by typing or selecting from the menubutton label on the left of the entry area Then press the “plot” button Press the menubutton labeled “origin”, and select “site” Use the button to the ... they introduce some of the knottiest problems in database management, whether you are using Datascope or any other relational database management system Because they have no meaning outside the ... value The main portion of the window has a column for each field, up to the limit of what will fit on the screen The scrollbar on the left controls the range of records displayed, while the scrollbar...

Ngày tải lên: 20/02/2014, 05:21

... are: (1) the cardinulity, i.e., the number of records in the sequence,(2) the record width, i.e., the number of bytes in each record, (3) the density, i.e the percentageof the positions in the underlying ... positions as the 100% *The entriesin the table are approximate sincethey only showthe last day, not the last hout pGppFpq While the spaceoverheadfor eachfile is eliminated, the other drawbacks ... In all the graphs ,the number of fields in eachrecord varies along the X-axis, while the runtime is plotted on the Y-axis For all the implementations, the scancost grows with the width of the records...

Ngày tải lên: 16/03/2014, 16:20

... the prefix and the timestamp as the suffix P tr is the offset that points to the location of a data record in the log, which includes three information: the file number, the offset in the file, the ... information while Data stores the content of the write, including the record’s primary key, the updated column group, the timestamp of the write, and the new value of data Then the tablet server writes ... key, the tablet server first checks whether the corresponding record exists in the read buffer If the value is found, it is returned and the request is completed Otherwise, the server obtains the...

Ngày tải lên: 16/03/2014, 16:20

... fetched from the SDSS Data Archive Server (DAS) to the computing nodes SkyServer is the Web portal to the SDSS Catalog Archive Server (CAS) – the relational database system hosting the SDSS catalog ... and stores the final cluster catalog Retrieve the members of the clusters retrieves the galaxies that the MaxBCG algorithm determined are part of the cluster 2.2 The TAM Implementation The MaxBCG ... because the database scans the areas using high-speed sequential access and spatial indices rather than keeping all the data in the RAM Figure Selection of the galaxy parameters required to solve the...

Ngày tải lên: 30/03/2014, 13:20

... multiple database systems by applying the same transactions in the same order on each system However, since the database systems not guarantee equivalence to any given serial order, the middleware systems ... replaying the transactions from the durable list of transactions at the preprocessor), as long as the recovery scheme adheres to the system s determinism invariant U2 is not included in the ordered ... immediately locks these items It then checks if it locked the correct items (i.e., none of the transactions that ran in the meantime changed the dependency) If this check passes, then U2 can proceed;...

Ngày tải lên: 30/03/2014, 13:20

... replace these words and characters with appropriate entries The SAP DB Database System SAP AG April 2003 The SAP DB Database System: 12 Architecture of the Database System 12 Database ... 144 The SAP DB Database System 11 SAP AG April 2003 The SAP DB Database System: This manual gives you an overview of the database system SAP DB Version 7.4 and its tools Architecture of the Database ... SYSDBA The SYSDBA user (database system administrator) is a special database user [Page 28] of the database user class [Page 29] SYSDBA The SYSDBA user is the first database user that the Database...

Ngày tải lên: 30/03/2014, 22:20