What does coalescing a tablespace do?
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Answer / guest
A free extent in a dictionary-managed tablespace is made up
of a collection of contiguous free blocks.
When allocating new extents to a tablespace segment, the
database uses the free extent closest in size to the
required extent. In some cases, when segments are dropped,
their extents are deallocated and marked as free, but
adjacent free extents are not immediately recombined into
larger free extents. The result is fragmentation that makes
allocation of larger extents more difficult.
Oracle Database addresses fragmentation in several ways:
When attempting to allocate a new extent for a segment, the
database first tries to find a free extent large enough for
the new extent. Whenever the database cannot find a free
extent that is large enough for the new extent, it
coalesces adjacent free extents in the tablespace and looks
again.
The SMON background process periodically coalesces
neighboring free extents when the PCTINCREASE value for a
tablespace is not zero.
If you set PCTINCREASE=0, no coalescing of free extents
occurs. If you are concerned about the overhead of ongoing
coalesce operations of SMON, an alternative is to set
PCTINCREASE=0, and periodically coalesce free space
manually.
Manually Coalesce any adjacent free extens user this
command:
ALTER TABLESPACE <<TABLESPACENAME>> COALESCE
| Is This Answer Correct ? | 18 Yes | 1 No |
Answer / prashe
Coalescing is only valid for dictionary-managed tablespaces
and de-fragments space by combining neighboring free extents
into large single extents.
| Is This Answer Correct ? | 5 Yes | 5 No |
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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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