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IO Subsystem in .NET Generation ean13+5 in .NET IO Subsystem




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IO Subsystem use .net framework ean-13 supplement 5 generating toconnect ean/ucc-13 for .net QR Code ISO speicification 1,550 Fast Disks 1,012. 1,000. 1,500. 2,000. 2,500. 3,000. 3,500. Elapsed Time (ms). Conventional Mode Insert Direct Mode Insert FIGURE 14-6 Dire ct mode insert can be slower than conventional inserts if the disk subsystem is slow or overloaded.. 14 Direct path UPC-13 for .NET insert is most commonly associated with CREATE TABLE AS SELECT and INSERT from SELECT statements. However, you can also use direct path insert when doing bulk inserts in PL/SQL, as in this example:.

FORALL i IN 1 .. g_prods.

LAST INSERT /*+ append */ INTO SALES(PROD_ID, CUST_ID, TIME_ID, CHANNEL_ID, PROMO_ID, QUANTITY_SOLD, AMOUNT_SOLD) VALUES (g_prods(i), g_custs(i), g_times(i), g_channels(i), g_promos(i), g_quantities(i), g_amounts(i)); A direct path insert is indicated in EXPLAIN PLAN by the LOAD AS SELECT step. If the rows are inserted by an array insert, the child operation is BULK BIND GETS: -----------------------------------------------------------------. Id Operation Name Rows Cost (%CPU). Time --------------- visual .net UPC-13 --------------------------------------------------. 0 . INSERT STATEMENT 1 . 1 (0). 00:00:01 . 1 . LOAD AS SELECT SALES 2 . BULK BINDS GET --------------- --------------------------------------------------In an INSERT from SELECT statement, the LOAD AS SELECT is followed by the execution plan for the SELECT statement: ---------------------------------------------------. Id Operation Name Rows --------------- EAN/UCC-13 for .NET ------------------------------------. 0 . INSERT STATEMENT 99999 . 1 . LOAD AS SELECT SALES 2 . TABLE ACCESS FULL SALES_UPDATES 99999 . --------------- ------------------------------------Because direct path inserts cannot reuse free space within existing blocks, a table that is populated exclusively by direct path inserts tends to use more blocks, which make full table scans more expensive. Consequently, you might be motivated to rebuild tables populated by direct path inserts more frequently. MULTI-TABLE INSERT A single INSERT statement can insert rows into more than one table.

This comes in handy if we have a source table containing new data that needs to be applied to multiple target tables.. DML Tuning For instance, sa y we receive the sales updates for the US and EMEA (Europe, Middle East, and Africa) in a single staging table but that each region has its own SALES fact table. Our first thought might be to issue multiple INSERT statements: INSERT INTO sales_emea (PROD_ID, CUST_ID, TIME_ID, CHANNEL_ID, PROMO_ID, QUANTITY_SOLD, AMOUNT_SOLD) SELECT PROD_ID, CUST_ID, TIME_ID, CHANNEL_ID, PROMO_ID, QUANTITY_SOLD, AMOUNT_SOLD FROM sales_updates WHERE region = "EMEA"; INSERT INTO sales_us (PROD_ID, CUST_ID, TIME_ID, CHANNEL_ID, PROMO_ID, QUANTITY_SOLD, AMOUNT_SOLD) SELECT PROD_ID, CUST_ID, TIME_ID, CHANNEL_ID, PROMO_ID, QUANTITY_SOLD, AMOUNT_SOLD FROM sales_updates WHERE region = "US"; Alternatively, we can use a single INSERT, like this: SQL> INSERT ALL 2 WHEN region = "EMEA" THEN INTO sales_emea 3 (PROD_ID, CUST_ID, TIME_ID, CHANNEL_ID, 4 QUANTITY_SOLD, AMOUNT_SOLD) 5 VALUES (PROD_ID, CUST_ID, TIME_ID, CHANNEL_ID, 6 QUANTITY_SOLD, AMOUNT_SOLD) 7 WHEN region = "US" THEN INTO sales_us 8 (PROD_ID, CUST_ID, TIME_ID, CHANNEL_ID, 9 QUANTITY_SOLD, AMOUNT_SOLD) 10 VALUES (PROD_ID, CUST_ID, TIME_ID, CHANNEL_ID, 11 QUANTITY_SOLD, AMOUNT_SOLD) 12 SELECT * FROM sales_updates; ----------------------------------------------------. Id Operation Name Rows --------------- VS .NET EAN 13 -------------------------------------. 0 . INSERT STATEMENT 1061K. 1 . MULTI-TABLE INSERT 2 . INTO SALES_EMEA 3 . INTO SALES_US 4 . TABLE ACCESS FULL SALES_UPDATES 1061K. --------------- .NET ean13+5 --------------------------------------. PROMO_ID, PROMO_ID,. PROMO_ID, PROMO_ID,. 14 The multi-ta ble insert outperforms the individual inserts because it needs to only do a single pass through the source table. Figure 14-7 illustrates the performance gain for our preceding example..

A multi-table INSERT statement might outperform multiple individual INSERT statements. MANUAL SEGMENT S TORAGE MANAGEMENT (MSSM) AND FREELISTS We first discussed the role of freelists and Manual Segment Storage Management (ASSM) in 4, Logical and Physical Database Design. When MSSM is employed relatively rarely in modern Oracle deployments each table is associated with one or more freelists, which keep track of blocks that have free space and that are therefore eligible to be the target of INSERT operations. When multiple processes concurrently insert into tables with an insufficient number of freelists, contention can result, usually showing up as buffer busy waits.

The solution is simply to add more freelists using an ALTER TABLE statement..
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