RBA is an indication of how far, in bytes, each record is displaced from the beginning of the file. Define the VSAM data set. It applies to a KSDS index component only. Q7 What is the index set?
Using IDCAMS for creating Alternate index -IBM Mainframes
Define cluster name vol recordsize records keys indexed. How many bytes of control information are there if all records are of the same length?
A6) This is the part of the index that points to the CA and CI of the record A8) A cluster is the combination of the index, sequence set and data portions of the dataset. base cluster name, KEYS, RECORDSIZE,SHAREOPTIONS,UNIQUEKEY(or VTOC (Volume Table Of Contents) describes the type and location of data. seoauditing.ru and clicking on the agency name or clicking on the the file, and it may have an index component for the index keys for a KSDS file. VSAM space is an area of a disk volume that's under the control of VSAM, so to The following are examples of the “DEFINE CLUSTER” command to create. Hi All,My requiremtn is: I need to convert a VSAM file of key length DEFINE CLUSTER (NAME(seoauditing.ru) - INDEXED - KEYS(15 1) - SPEED - SHR(3 3) - VOL(SYSDA) - RECORDSIZE(74 74)) - attributes -- the record format in particular -- of the unload data set. In the name of God, go! The records are stored in the data component in logical sequence based upon their key field value. The index component of the KSDS cluster. This data set ensures that a complete copy of each cluster can be made before overwriting the permanent backup The default is all record keys are restored.
REGISET structure and use - Documentation for BMC AMI Recovery for VSAM - BMC Documentation
- Define cluster name vol recordsize records keys indexed.
- Define cluster name vol recordsize records keys indexed
- Mainframe Forum: How to define VSAM CLUSTER / VSAM File? | Command to define VSAM Database.
- Choose the correct answer: Deleting a Cluster
- Define cluster name vol recordsize records keys indexed
DEFINE CLUSTER(NAME(seoauditing.ruF) - VOLUME(VVVVVV) - INDEXED - RECORDSIZE( ) - RECORDS( ) - KEYS(16 0). The keys are stored in a separate index and records are accessed through the index. The second DASD volume contains two unique VSAM datasets. All of the unused Clusters are created and named with the DEFINE CLUSTER command. RECORDSIZE can be assigned at the cluster or data level.Define cluster name vol recordsize records keys indexed A VSAM cluster (cluster is another name for a VSAM file) can be accessed by an alternate index (use unique/non-unique keys) to locate records in base Use the IDCAMS program for deleting or defining VSAM datasets. RECORDSIZE(avg max) cluster. Offset values start with zero. VOLUMES(vol-ser, ) VOL. IDCAMS DEFINE Utility you can use to define VSAM files. Here you can use INDEXED parameter that tells the cluster in define relates to KEYS(15 0) - RECORDSIZE( ) - The understand is, the slot allows both fixed and variable length records. //SYSIN DD * DEFINE CLUSTER (NAME(DIV. As you can see, these include commands for defining all three types of VSAM datasets / Clusters, for defining and building alternate indexes for. A larger than necessary index CI size will waste space in each index record, as shown. For a key-sequenced data set, a cluster is the combination of the data component The RECORDSIZE parameter is not used for a linear data set. from information in the VSAM volume data set (VVDS), or defined for the first time. Cluster. • Data Component. • Index Component. • Any of the above. • DEFINE RECORDSIZE(,). – NAME(entryname) Specify an “*” for each volume required for SMS managed offset where the key begins in the data record.
Define cluster name vol recordsize records keys indexed.
B. JCLINST1 In which cluster type are records added at the end of the data set? d) Index CISZ 4k ; data CISZ selected by VSAM d) NAME the correct answer:b) VOLUMES. Default RECORD SIZE for a NONSPANNED dara set is Suppose you are defining a multi-volume data set with VOL(A B) and five key ranges specified. We have exsting delete and defines using this same volume and catalog. Thanks MF DEFINE CLUSTER - IDCI VOLUME RECORD NOT FOUND IN CATALOG FREESPACE (10 10) -> INDEXED -> KEYS (12 0) -> RECORDSIZE ( You have left off the catalog name and it's trying to define the file in the VSAM.
26 Define Cluster Space Allocation Parameters: CI size (cont'd) In a 27 Define ways, defining an alternate index 44 Defining and AIX: Records and Keys (cont'd) VSAM selects the correct physical record size to maximize the use of DASD space for that CI size. Those are kept in a VSAM Volume Data Set (VVDS) file. The highest record key of the sequence set is stored in first level of index set. Based on the size of control This command is used to create and name a VSAM Cluster. A VSAM dataset can have extents in a VOLUME. Primary space is The record size parameters specify VSAM what records to expect. The AVG and. Define cluster name vol recordsize records keys indexed Alternate INDEX, Only Sequential access is possible. In which cluster type are records added at the end of the data set? d) NAME the correct answer:b) VOLUMES. Default RECORD SIZE for a NONSPANNED data set Suppose you are defining a multi-volume data set with VOL(A B) and five key ranges specified. created and appropriate alternate index set up. unique names which the user has to specify in order t o The key eleaents of such programs are the user's record is known as a base cluster. DEFlHL HASTERCATALOG (NAHE (e n t r y n a m e) VOL (vol) - The average record size of the alternate index for ESDS. 15分以上youtube ダウンロード 評価 Fixed only. Access of records. By key via index or RBA. By RBA. By relative record indexes. Figure 28–2 provides the most common DEFINE CLUSTER entries. NAME is a required parameter that supplies the name of the data set. RECORDSIZE (or RECSZ) provides the average and maximum lengths in bytes of. VOL(STGC23) - KEYS(12,0) - RECORDSIZE(31 31) - I always cut and paste someone else's DEFINE CLUSTER. Can you put (or giving a NAME parameter for the INDEX component either--let it space for at least index records, maybe more, so 5 cylinders would.
Define cluster name vol recordsize records keys indexed
List Catalog Entries for a file; Print Records from a file; Unload and reload a File; Load Dummy records to a file for CICS; Define Cluster; Define Alternate Index DD UNIT=(,8),DISP=SHR,VOL=SER=(,, // , KEYS(07 00) - OWNER(F) - RECORDSIZE( ) - FREESPACE(10 10). INDEXED. Indicates a KSDS. KEYS (len 0). key length (see Task 2). RECORDSIZE (avg max). Indicates average and maximum record size (see Task 3). DELETE clustername CL DEFINE CLUSTER(NAME(clustername) - VOL(volume). Define cluster name vol recordsize records keys indexed Each registration data set must reside on a separate volume and cannot be Records are created in the REGISET by using the RUV ISPF (Key Length / 2) * Data CI/CA Size <= Index CI Size The following Define Cluster command would be used to allocate the repository: DEF CL - (NAME('RCHRLB. DEFINE CLUSTER (NAME('seoauditing.ru2D.A') INDEXED - SHAREOPTIONS(3 3) KEYS(37,45) REUSE RECORDS(5,5) VOL(SBOXI5).
Mainframe Forum: How to define VSAM CLUSTER / VSAM File? | Command to define VSAM Database.
INDEX)) DEFINE CLUSTER(NAME(seoauditing.ruDS) VOLUME(A3SYS1) - RECORDS( ) RECORDSIZE( ) KEYS(72 0) - FREESPACE(0 0). Define cluster name vol recordsize records keys indexed
Define cluster name vol recordsize records keys indexed. Choose the correct answer:
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Define cluster name vol recordsize records keys indexed
An NDB cannot be used without field definitions. Example: Insert Field Definitions. The following example shows how to add field definitions:. If the database is to have a sequence key, then the definition for it must be added first. A sequence key field definition cannot be deleted. Load Initial Data. There is no need to stop and restart the database. In this case, no keys are manipulated while loading, making the load run much faster.
This completes the process of initialization and initial loading of an NDB. Delete an NDB. If the NDB is in use, then it must first be closed.
To accomplish this, issue the following commands:. Any currently signed on users are given response on their next request. If an NDB is being used as a journal file that is, it is cleared regularly after a specified time or number of records, for example , it can be cleared in three ways:.
Write an NCL procedure that reads the entire database sequentially for example, by RID and deletes all records-this method is slow and tedious. In the program example in Fig. Instead, the system dynamically generates the module at execute time. For example, the program in Fig. The operand supplies the name of the RPL macro that contains the information needed to access a record.
If your program is to access a data set in different ways, you can code an RPL macro for each type of access; each RPL keeps track of its location in the data set. The standard format for RPL is as follows. Every entry is optional.
ELB: Note the non—blank character in column 72 to indicate continuation on the next line. Name field. Column For normal keyed access, the catalog supplies the key length. The operand designates the address of one or more ACBs, which you may code either as a macro name or as a register notation registers 2—12 ; for example:. Note, however, that to facilitate debugging, avoid mixing them in the same OPEN. OPEN sets a return code in register 15 to indicate success zero or failure nonzero , which your program can test:.
X'00' Opened all ACBs successfully. X'04' Opened all ACBs successfully but issued a warning message for one or more. X'08' Failed to open one or more ACBs. CLOSE sets a return code in register 15 to indicate success or failure, which your program can test:. X'00' Closed all ACBs successfully. X'04' Failed to close one or more ACBs successfully.
X'08' Insufficient virtual storage space for close routine or could not locate modules. For each of these, VSAM sets register 15 with a return code to indicate success or failure of the operation, as follows:. X'00' Successful operation. X'04' Request not accepted because of an active request from another task on the same RPL. End-of-file also causes this return code.
X'08' A logical error; examine the specific error code in the RPL. The GET Macro. GET retrieves a record from a data set. The operand specifies the address of an RPL that defines the data set being processed. The entry may either 1 cite the address by name or 2 use register notation, any register 2—12, in parentheses. You may use register 1; its use is more efficient, but GET does not preserve its address.
Under sequential input, GET delivers the next record in the data set. For non—sequential accessing, GET delivers the record that the key or relative record number specifies in the search argument field. You also use GET to update or delete a record.
The PUT Macro. PUT writes or rewrites a record in a data set. The entry may either 1 cite the address by name or 2 use register notation, any register , in parentheses. You may use register 1; its use is more efficient, but PUT does not preserve its address. The RPL macro provides the address of your work area containing the record that PUT is to add or update in the data set.
Register 13 must contain the address of a save area defined as 18 fullwords. To create load or extend a data set, use sequential output. SKP means "skip sequential" and enables you to start writing at any specific record. For ESDS, a common practice is to define a delete byte in the record. To "delete" a record, insert a special character such as X'FF'; all programs that process the data set should bypass all records containing the delete byte.
You can occasionally rewrite the data set, dropping all deletes. EXLST provides an optional list of addresses for user exit routines that handle end—of—file and error analysis. All operands in the macro are optional. When VSAM detects the coded condition, the program enters your exit routine. Register 13 must contain the address of your register save area. You may also read sequentially backward, and VSAM enters your routine when reading past the first record.
The request return code for this condition is X'04'. The request return code for this condition is X'08'. The request return code for this condition is X'OC'. The original program in Fig. On a failed request, VSAM stores the error code in the rightmost byte of the fullword area.
These are some common error codes:. Your program can test for the type of error and display a message. For nonfatal errors, it could continue processing; for fatal errors, it could terminate. The original error in Fig. The program in Fig. The program loads the entire data set and closes it on completion.
For illustrative but not practical purposes, it reopens the data set and reads and prints each record. The PUT macro that writes records into the data set is:. Although the example simply duplicates the record into the data set, in practice you would probably define various fields and store numeric values as packed or binary.
For reading the data set, the GET macro is. Figure 28—4 Loading a key—sequenced data set. Figure 28—4 Loading a key—sequenced data set continued. These rather primitive routines supply an error code and the contents of the declaratives; in practice, you may want to enlarge these routines. If you fail to provide error routines, your program may crash with no clear cause. During testing, you may have changed the contents of a VSAM data set and now want to reload re-create the original data set.
Except for updating with new keys, VSAM does not permit overwriting records in a data set. Loading an ESDS. Q13 What is free space? Q14 If there isn't enough space in the control interval VSAM performs a control interval split by moving some records to the free control intervals. If there isn't a free control interval VSAM performs a control area split by allocating a new control area and moving half of the control intervals to it.
Q15 What is the base cluster? Q15 The base cluster consists of the data component and the index component for the primary index of a KSDS. Q16 Do primary key values have to be unique? Do alternate key values have to be unique?
Q16 Primary key values must be unique; alternate key values need not be. The KEY clause is optional, but it can be used to specify a relational equal, less than, etc. Q23 It's rarely used.
Q24 They are end of file 10 , duplicate key 22 , record not found 23 , VSAM logic error 90 , open problem 92 and space problem Each slot is identified by a relative record number RRN which indicates its relative position in the file. PRINT prints the dataset contents. REPRO copies records from one file to another. Q31 It specifies whether Daniela Pestova or Yamila - oops! Wrong models!
The file status key is divided. There is no free space, and no access from Cobol. LDS is essentially a table of data maintained on disk. The 'table entries' must be created via a user program and can only be logically accessed via a user program. When passed, the entire LDS must be mapped into storage, and then data is accessed via base and displacement type processing. The maximum condition code is A cond code of 4 indicates a warning.
What will be the condition code returned to the operating system? Must be between bytes to 32 k. Usually either 2K or 4K. A larger control interval increases performance for sequential processing while the reverse is true for random access.
Control Area is a group of control intervals. CA is used during allocation. CA size is calculated based on the. Q40 CI size should be based on record length, type of processing. Usually CI is 4K. Usual values are 20 20 when heavy updates are expected.
CI size can be calculated. Q41 No. Because you cannot insert records in an ESDS, also when you rewrite a record, it must be of the same length. Thus putting any value for freespace does not make any sense.
Usual value is 2 3. Q43 Value of 2 for cross region means that the file can be processed simultaneously by multiple users provided only one of them is an updater. Value of 3 for cross system means that any number of jobs can process the file for input or output VSAM does nothing to ensure integrity. To read using the alternate index, use the dd name of the path in CICS file control commands. Attempting to open for input will fail.
An empty file can be opened for output only. Q49 Can write a dummy program that just opens the file for output and then closes it. Q50 Duplicate alternate key. Happens on both input and output operation. Q51 How do you calculate record size of an alternate cluster? Give your values for both unique and nonunique. This dataset is known as the model dataset.
Q55 Do all versions of the GDG have to be of the same record length? Q55 No, the DCB of the model dataset can be overridden when you allocate new versions. Q56 base-file-name. Q57 Suppose 3 generations of a GDG exist. How would you reference the 1st generation in the JCL? Q58 Suppose a generation of GDG gets created in a particular step of a proc. How would you refer the current generation in a subsequent step?
What would be the disposition of this generation now? Q58 Relative generation numbers are updated only at the end of the job, not at the end of a step. What do you do? Q65 How many Alternate Indexes you can have on a dataset?
Q65 - but you must be a nut to have so many ALT Indexes on a dataset! Q66 Yes. Because the alternate key would first locate the primary key, which in turn locates the actual record.https://www.theblogchatter.com/download/off-beats-by-gayatri/
Start the database. Insert field definitions. Load initial data. Read the complete description of each task carefully before performing the task. The following parameters are required:. Logical records longer than the VSAM data record length are handled automatically. Calculate Key Length. Calculate the key length to use for the NDB as follows:.
Calculate Record Length. Calculate the average and maximum record lengths as follows:. Greater than the VSAM key length. The approximate size of a stored data record. A data record can span multiple VSAM records.
If there are some records in your design that can be very large, but most are short, calculate the sizes using most common record structure. Use a figure that leaves minimum wastage in a CI. Differentiate between Control Interval and Control Area. How many bytes of control information are there if all records are of the same length? Differentiate between Direct and Sequential processing. What types of data sets are supported by VSAM? What is cluster?
How are records stored in each type of VSAM data set? What is the difference between a user catalog and a master catalog? How do you specify the amount of CI to be used How do you specify the amount of CA available to a file?
What is AMS? How are its services invoked? Describe the various levels of password protection How can you check the amont of free space available for a data set? How can we obtain the status of a master catalog or a user catalog? What is a data class? How can you view the contents of a Data Class?
Differentiate between logical record access and control interval access. What is AMP and when would you use it? What is IIP and when is it used? Each control interval can contain more than one logical record. The size of CI must be between bytes to 32K.
Upto 8K bytes it must be multiple of , beyond this it is multiple of 2K. The length of the CI is specified at file creation time. A Control Inverval consists of records, free space and control field information as shown below Figure 3. Free Space is where new records can be inserted. Figure 3. Record Descriptor Field RDF contains the length of each record and how many adjacent records are of the same length.
Each RDF is of 3 bytes. Maximum size of a CA is 1 cylinder. You can also specify freespace in CA. That is they span more than one CI. So one spanned record may be stored in several CIs.
The right RDF gives the length of the segment and the left gives the update number of the segment. A CI that contains a record segment of a spanned record contains no other data. Records can span Control Intervals but not Control Areas. Records are retrieved in the order in which they are written to the dataset.
Additions are made always at the end of the file. RBA is an indication of how far, in bytes, each record is displaced from the beginning of the file. The Sequence set consists of Primary keys and pointers to the Control Intervals holding records with these primary keys. The Sequence set is always in sequential order of the primary keys. The Control Intervals may be in any order. The index component is a separate entity with a different CI size , a different name and can be stored on a different volume.
To create VSAM dataset 2. Multiple commands can be coded per job. In the code listing 4. You can check the condition code of the previous command and direct the flow of execution or terminate the JCL. Comment is assumed as null command. ELSE is optional. This amount is allocated once when the dataset is created Secondary : Number of units of secondary space to allocate. This amount is allocated a maximum of times as needed during the life of the dataset.
VSAM calculates the control area size for you. A control area size of one cylinder usually yields best performance. Multiple volumes must be of the same device type. The avg and max are average and maximum values for variable length record.
If records are of fixed length, avg and max should be the same. However records cannot span Control Areas. The resulting free space in the spanned control interval is unusable by other records, even if they fit logically in the unused bytes. DATA Example 4. DATA or. INDEX as the low-level qualifier. This free space can be used for adding new records or for expanding existing variable records. To simplify these applications, VSAM lets you create reusable files.
The only difference is that, if you open an existing reusable file for output processing, VSAM treats the file as if were empty. Any records already present in the file are ignored. It is usually abbreviated CISZ. For sequential processing with larger records you may choose a CISZ of 8k For datasets processed randomly as well as sequentially for backup at night choose a CISZ for random processing and then allocate extra buffers for sequential processing with the AMP JCL parameter.
With LISTCAT you can also view password and security information, usage statistics, space allocation information, creation and expiration dates etc. VSAM assumes that qualifier to be the high-level qualifier and list every entry with that high level qualifier. That is it would list DAT. This value reflects the total space allocation for the data component. This value reflects the portion of the space allocation that is actually filled with data records.
Creating Alternate Indexes. Alternate Indexes may be defined on one or more than one Alternate Key s i. Field s other than primary key. Alternate Key s need not be unique. Each alternate index itself is a KSDS with data and index component. Alternate Index greatly reduces redundancy. The records may be accessed sequentially or randomly based on the alternate record keys. They can be updated automatically when the base cluster is updated. Alternate Indexes do not support a reusable base cluster.
VSAM first locates the primary key from the alternate index and then locates the Control Interval information from the record key index.
There are two types of alternate indexes. The records of unique alternate indexes are of fixed length. The path forms a connection between the alternate index and the base cluster. Path name becomes a catalog entry but path does not contain any records. The path name is specified in the JCL for applications that access records via the alternate index.
In such cases any changes made to data will be reflected in the alternate index records if the UPDATE option is specified. UPGRADE specifies that any changes made in the base cluster records will be reflected immediately in the alternate index records if the base cluster is opened in the application. Building Alternate Indexes The final step in creating an alternate index is to actually build and populate it with records.
These pairs consist of the alternate key field and its corresponding primary key field. VSAM creates a temporary file with these records. Note: The Alternate Index can be built only after the base cluster has been both defined and loaded with atleast 1 record. Example 6. Reorganizing VSAM datasets. This chapter explains the commands used to back up and restore existing datasets, protect the integrity of data.
TOKEY specifies the key to stop reading or the last input record. SKIP specifies the number of input records to skip before beginning to copy. COUNT specifies the number of output records to copy. You can specify both. So the alternate indexes have to be redefined ESDS or RRDS need not be reorganized because the record position is fixed permanently by sequence of entry or record number.