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Database Articles
Page 220 of 547
How to recover a DB2 table space TABSPC1 using the image copy TOLASTCOPY?
The DB2 provides an utility RECOVER which is used to restore the tablespace. This utility uses image copy and DB2 logs to restore the changes. The following command can be used to recover the tablespace to the last image copy that was taken.RECOVER TABLESPACE DBSET1.TABSPAC1 TOLASTCOPYThe RECOVER TABLESPACE is followed by the name of tablespace qualified by the database in which it resides. The TOLASTCOPY parameter will restore the image copy in the following way. If the most recent image copy is full image copy, then the full image copy is restored in the tablespace. If the most recent image ...
Read MoreHow to do a full & incremental MERGECOPY for a DB2 table TAB1?
The MERGECOPY is just opposite of IMAGECOPY. This DB2 utlility is used to combine the multiple image copy datasets into a new full or incremental image copy. This is mainly used to restore the backup in the DB2 table.The below JCL step can be used for the incremental MERGECOPY for DB2 table TAB1 which is residing in the database DBSET1−//STEP010 EXEC DSNUPROC //COPY1 DD DSN=TEST.DB2.COPY1, DISP=(MOD, CATLG, CATLG), // UNIT=SYSDA, SPACE=(4000, (20, 20), , , ROUND) //COPY2 DD DSN=TEST.DB2.COPY2, DISP=(MOD, CATLG, CATLG), // UNIT=SYSDA, SPACE=(4000, (20, 20), , , ROUND) //SYSOUT DD SYSOUT=* //SYSIN DD * MERGECOPY TABLESPACE DBSET1.TBSPAC01 COPYDDN ...
Read MorePurpose and table creation syntax of "Created temporary table
The Created temporary tables are non-permanent DB2 tables that exist as long as the process using this table is active. For example any batch program. The created temporary tables are best suited for the sequential access and hence system performance is not a concern over here.The created temporary tables can be created using the DDL statement CREATE GLOBAL TEMPORARY TABLE followed by the name of the temporary table. This statement makes the entry of the new table in DB2 system table SYSIBM.SYSTABLES with type column as ‘G’.The created temporary table should always be created using the above DDL statement before ...
Read MoreHow to get the list of all COBOL-DB2 programs using a DB2 table TAB1?
SYSIBM.SYSTABAUTH is a DB2 system table which records the privileges that users/program hold on tables and views. We can use this table to find out the list of programs accessing a particular table and what action the program is performing on the table like SELECT, UPDATE, INSERT or DELETE. The below SQL query can be fired on SYSTABAUTH in order to get list of programs.SELECT GRANTEE, SELECTAUTH, UPDATEAUTH, INSERTAUTH, DELETEAUTH FROM SYSIBM.SYSABAUTH WHERE GRANTEETYPE = ‘P’ AND TNAME = ‘TAB1’The column SELECTAUTH, UPDATEAUTH, INSERTAUTH and DELETEAUTH represents SELECT, UPDATE, INSERT and DELETE authority respectively. In the WHERE clause we will ...
Read MoreHow to find out all the indexes for a DB2 table TAB1?
To find out all the indexes built on the DB2 table TAB1 we can use the DB2 system table SYSIBM.SYSINDEXES. The SYSINDEXES database has one row for every index present in DB2. We can find indexes built on a particular table using the below SQL query.SELECT NAME, UNIQUERULE, CLUSTERING FROM SYSIBM.SYSINDEXES WHERE TBNAME=’TAB1’The column UNIQUERULE in the SELECT statement returns ‘P’ for primary index and ‘U’ for alternate index. The CLUSTERING column will be returned as ‘YES’ for clustered index and ‘NO’ for non-clustered index.
Read MoreHow to find the primary key of a DB2 table TAB1?
We can find the primary key of any table using the SYSIBM.SYSCOLUMNS table. The SYSIBM.SYSCOLUMNS is a DB2 system table which contains one row for every column of each table. It also contains the data related to the views. Below SQL query can be fired in order to find the primary key of a particular table.SELECT NAME FROM SYSIBM.SYSCOLUMNS WHERE TBNAME = 'TAB1’ AND KEYSEQ > 0 ORDER BY KEYSEQ ASC;We will use our table name in the TBNAME column of SYSCOLUMNS table using the WHERE clause and KEYSEQ > 0 will return only primary keys.
Read MoreHow to image copy the entire DB2 table TAB1 into a dataset?
The image copy allows us to download or copy the DB2 table into a mainframe dataset. There are two types of Image copy i.e. Full image copy and Incremental image copy. The full image copy is used to take the backup of the entire table. The incremental image copy refers to the differential backup. In order to take the full image copy of the DB2 table we can use the below JCL step.//STEP1 EXEC DSNUPROC //SYSCOPY DD DSN=TEST.TAB1.COPY, UNIT=SYSDA, VOL=SER=CPY01I, // SPACE=(CYL, (15, 1)), DISP=(NEW, CATLG, CATLG) //SYSOUT DD SYSOUT=* //SYSIN DD * COPY TABLESPACE TAB1SPAC /*We can use the ...
Read MoreHow to create a DB2 segmented tablespace TABSPAC2 in storage group STOGRP1?
A segmented table space is divided in multiple segments. A segment is defined as a contiguous set of fixed number of pages. This fixed number is defined during the table space definition using the SEGSIZE parameter. The SEGSIZE serves multiple purposes - It defines the tablespace as segmented and also defines the size of the segment.In a segmented tablespace, the rows of a table are stored in one or more segments and a particular segment can only have rows from one table.The segmented tablespace can be created by using the CREATE TABLESPACE command with SEQSIZE parameter as below.CREATE TABLESPACE TABSPA1 ...
Read MoreHow to add a row compression to a DB2 table TAB1?
A compression is used to save the DB2 disk space. The compression can be used either at row level or at a page level. In order to add a row compression in a DB2 table, we can give the following command−ALTER TABLE DBSET1.TAB1 COMPRESS YES STATICWe have to use ALTER TABLE for the compression of the DB2 table. The ALTER TABLE reserved words are followed by the name of DB2 table qualified by database. COMPRESS YES STATIC will complete the row compression for the said table.
Read MoreHow to delete a DB2 table TAB1?
We can delete the unused tables in the DB2. However, we must keep in mind that if we delete a table then all the indexes associated with the table are also dropped. Moreover, the triggers and views for the deleted table will become inaccessible. To delete any table in DB2, we can issue below command.DROP TABLE DBSET1.TAB1The DROP TABLE reserved word will be followed by the name of the table qualified by the database. The mentioned table will be deleted from the DB2 permanently.
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