Explain the difference between a data block, an extent and
a segment.
Answer / kumar.s
Datablock, Extent and Segment
A segment is defined as any entity that consumes physical
storage space within the database.
Each Oracle segment is made up of contiguous chunks of
storage space in the database called extents. Every segment
must have at least one extent, but can have as many as 2
billion extents.
Each extent is itself made up of a collection of smaller
chunks of space called Oracle database blocks. The minimum
size of an extent is five database blocks.
The default size of these database blocks is set at
database creation, but Oracle 10g db can use multiple block
sizes within one db. The common database block sizes are
2KB, 4KB, 8KB, and 16KB.
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CREATE OR REPLACE procedure XXPROC_OPENINT(errbuf OUT VARCHAR2, retcode OUT VARCHAR2) AS --Cursor Declaration cursor inv_cur IS SELECT INVI.INVOICE_ID ,INVI.INVOICE_TYPE_LOOKUP_CODE ,INVI.INVOICE_DATE ,INVI.VENDOR_ID ,INVI.VENDOR_SITE_ID ,INVI.INVOICE_AMOUNT ,INVI.INVOICE_CURRENCY_CODE ,INVI.STATUS ,INVI.GROUP_ID ,INVI.SOURCE ,INVI.ORG_ID ,INVI.DESCRIPTION ,INVI.CREATION_DATE ,INVI.CREATED_BY ,INVL.INVOICE_ID ,INVL.LINE_NUMBER ,INVL.LINE_TYPE_LOOKUP_CODE ,INVL.DESCRIPTION ,INVL.ORG_ID ,INVL.INVENTORY_ITEM_ID ,INVL.ACCOUNTING_DATE ,INVL.AMOUNT ,INVL.CREATION_DATE ,INVL.CREATED_BY ,INVL.PO_HEADER_ID ,INVL.PO_LINE_LOCATION_ID ,INVL.ITEM_DESCRIPTION FROM XXAP_INVOICES_INTERFACE_STG INVI ,AP_INVOICE_LINES_INTERFACE_STG INVL WHERE INVI.INVOICE_ID=INVL.INVOICE_ID AND INVI.ORG_ID=INVL.ORG_ID; l_currency_code varchar2(25); l_flag varchar2(2); l_error_msg varchar2(100); l_err_msg varchar2(100); l_err_flag varchar2(10); l_count number(9) default 0; BEGIN for rec_cur in inv_cur loop l_count:=l_count+1; --Currency Code Validation BEGIN SELECT currency_code INTO l_currency_code FROM FND_CURRENCIES WHERE currency_code ='USD'; EXCEPTION WHEN others THEN l_flag:='E'; l_error_msg:='Currency Code Does not Exists'; fnd_file.put_line(fnd_file.log,'Inserting Data Into The Interface Table'||'-'||l_count||' '||l_error_msg); END; IF l_flag!='E' THEN fnd_file.put_line(fnd_file.log,'Inserting Data Into The Interface Table'); INSERT INTO AP_INVOICES_INTERFACE( INVOICE_ID ,INVOICE_TYPE_LOOKUP_CODE ,INVOICE_DATE ,VENDOR_ID ,VENDOR_SITE_ID ,INVOICE_AMOUNT ,INVOICE_CURRENCY_CODE ,STATUS ,GROUP_ID ,SOURCE ,ORG_ID ,DESCRIPTION ,CREATION_DATE ,CREATED_BY) VALUES (rec_cur.INVOICE_ID ,rec_cur.INVOICE_TYPE_LOOKUP_CODE ,rec_cur.INVOICE_DATE ,rec_cur.VENDOR_ID ,rec_cur.VENDOR_SITE_ID ,rec_cur.INVOICE_AMOUNT ,rec_cur.INVOICE_CURRENCY_CODE ,rec_cur.STATUS ,rec_cur.GROUP_ID ,rec_cur.SOURCE ,rec_cur.ORG_ID ,rec_cur.DESCRIPTION ,rec_cur.CREATION_DATE ,rec_cur.CREATED_BY); INSERT INTO ap_invoice_lines_interface ( INVOICE_ID ,LINE_NUMBER ,LINE_TYPE_LOOKUP_CODE ,DESCRIPTION ,ORG_ID ,INVENTORY_ITEM_ID ,ACCOUNTING_DATE ,AMOUNT ,CREATION_DATE ,CREATED_BY ,PO_HEADER_ID ,PO_LINE_LOCATION_ID,ITEM_DESCRIPTION) VALUES (rec_cur.INVOICE_ID ,rec_cur.LINE_NUMBER ,rec_cur.LINE_TYPE_LOOKUP_CODE ,rec_cur.DESCRIPTION ,rec_cur.ORG_ID ,rec_cur.INVENTORY_ITEM_ID ,rec_cur.ACCOUNTING_DATE ,rec_cur.AMOUNT ,rec_cur.CREATION_DATE ,rec_cur.CREATED_BY ,rec_cur.PO_HEADER_ID ,rec_cur.PO_LINE_LOCATION_ID ,rec_cur.ITEM_DESCRIPTION); END IF; l_flag:=NULL; l_err_MSG:=NULL; END LOOP; COMMIT; END XXPROC_OPENINT; / PLS-00402: alias required in SELECT list of cursor to avoid duplicate column names
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