As per the standard DB2 definitions, timestamp holds 10 bytes in DB2 storage and 26 bytes in corresponding COBOL storage (PIC X(26)). It is in the format YYYY-MM-DDHH. MM.SS.NNNNNN. Where, YYYY:- Year | MM:- Month | DD:- Date | HH:- Hour | MM:- Minutes | SS:- Seconds | NNNNNN:- MillisecondsAs per the scenario given in the question, the timestamp is “2020-07-01 23:14”. Clearly, the format of the timestamp is incorrect as the correct format is YYYY-MM-DDHH. MM.SS.NNNNNN. In this case if we will try to insert this incorrectly formatted timestamp in a DB2 table column which is defined as timestamp ... Read More

To maintain the integrity of a DB2 table the primary key is always unique in the entire table. For example, if we have a DB2 table ORDERS which stores all the orders and the primary key of the table is column ORDER_ID. Then there can be only a single row having a particular order id. This will be useful to identify an order distinctly.If we try to insert or update a row in a DB2 table having duplicate primary key using a COBOL-DB2 program, we will get DB2 error code -803. As per the IBM documentation - 803 error code ... Read More

To start a specific tablespace within a DB2 database we can use below panel command.START DATABASE (DSNDB01) SPACENAM(TABSPAC1)Using the START DATABASE command, we can also start database and indexspace.

A database contains multiple components like tablespace, indexspace, index, tables, etc. We can find out all the components within the database using the below panel command.DIS DB(DSNDB01)

There are multiple ways in which we can estimate the size of the DB2 database. Few of them are listed below−By using inbuilt get_dbsize_info function.By using DB2 active transaction logs.The size of the dataset which was used with UNLOAD utility can be checked.Table/Index dataUsing STOSPACE utility in JCL as below//STEP1 EXEC DSNUPROC //SYSIN DD * STOSPACE DATABASE DSNDB01 //*

The pending state is set when the image copy is required for the table space or when the INDEX is in rebuild status. In this case a COPY PENDING/ REBUILD PENDING flag is set. We can repair this state by using the below JCL step.//STEP010 EXEC DSNUPROC REPAIR SET INDEX IDX1 NORBDPENDThis utility can also be used to repair the tablespace. For this we can use the REPAIR SET TABLESPACE statement. This is followed by the name of index or tablespace.

The tablespace reorganization is used to reorganize the data present in the system in order to reclaim the free space. This free space can be utilized to store the new data and therefore reorganization is very useful from a memory utilization point of view. We can reorganize any tablespace using DB2 REORG utility in JCL step as below.//STEP1 EXEC DSNUPROC,UID='IUJLU101.REORG', //UTPRINT DD SYSOUT=* //SYSIN DD * REORG TABLESPACE (DBSET1.TABSPAC1) //*The REORG TABLESPACE statement is followed by the name of the tablespace which needs to be reorganized qualified by dabasebase.

The DB2 RUNSTAT utility records the details of tablespace, table, index, etc in the system catalog. The RUNSTAT generates the data like space available in table space, indexes, access paths, etc. We can use the below JCL step to update the catalog statistics of DB2 tablespace TABSPAC2 and to sample 25% of the rows.//STEP1 EXEC DSNUPROC //UTPRINT DD SYSOUT=* //SYSIN DD * RUNSTATS TABLESPACE DBSET1.TABSPAC1    TABLE(ALL) SAMPLE 25    INDEX(ALL)The SYSIN parameter can be used with RUNSTATS TABLESPACE statement followed by tablespace name qualified by database name.

We can start the DB2 database by giving below command in panelDB2 ACTIVATE DSNDB001The DB2 ACTIVATE is followed by the name of the database which needs to be started.

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 More