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If you turn off AUTOTRACE, SQL*Plus will terminate this additional session and you will no longer see it in V$SESSION A question you might ask is, Why does SQL*Plus do this trick The answer is fairly straightforward SQL*Plus does it for the same reason that we used a second SQL*Plus session in 4 to monitor memory and temporary space usage: if we had used a single session to monitor memory usage, we would have been using memory to do the monitoring By observing the statistics in a single session, we would change those.

Listing 23-20. Querying the DBA_IND_COLUMNS View SQL> 2 3 4 5 6* SELECT index_name, table_name, column_name, column_position FROM DBA_IND_COLUMNS WHERE table_owner='OE';

Figure 9-4. A synchronous blind interaction The notion of trust is important in this type of interaction. If the callee dies while executing the command, control may never return to the caller, and the whole system will appear to have died. A software system built exclusively using synchronous interactions will only be as reliable as the least reliable component. Components calling other components synchronously place a great deal of faith in the callees. For this reason, synchronous blind interactions are used most commonly with simple commands and when the probability of success is extremely high.

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INDEX_NAME TABLE_NAME COLUMN_NAME COLUMN_POSITION ----------------------- ----------- ------------------------CUST_ACCOUNT_MANAGER_IX CUSTOMERS ACCOUNT_MGR_ID 1 CUST_LNAME_IX CUSTOMERS CUST_LAST_NAME 1 CUST_EMAIL_IX CUSTOMERS CUST_EMAIL 1 INVENTORY_PK INVENTORIES PRODUCT_ID 1 INVENTORY_PK INVENTORIES WAREHOUSE_ID 2 INV_PRODUCT_IX INVENTORIES PRODUCT_ID 1 ORDER_PK ORDERS ORDER_ID 1 ORD_SALES_REP_IX ORDERS SALES_REP_ID 1 ORD_CUSTOMER_IX ORDERS CUSTOMER_ID 1 SQL>

statistics. If SQL*Plus used a single session to report on the number of I/Os performed, how many bytes were transferred over the network, and how many sorts happened, then the queries used to find these details would be adding to the statistics themselves. They could be sorting, performing I/O, transferring data over the network (one would assume they would!), and so on. Hence, we need to use another session to measure correctly. So far, we ve seen a connection with one or two sessions. Now we d like to use SQL*Plus to see a connection with no session. That one is pretty easy. In the same SQL*Plus window used in the previous example, simply type the misleading command, DISCONNECT: ops$tkyte@ORA10G> disconnect Disconnected from Oracle Database 10g Enterprise Edition Release 10.1.0.3.0 Production With the Partitioning, OLAP and Data Mining options ops$tkyte@ORA10G> Technically, that command should be called DESTROY_ALL_SESSIONS instead of DISCONNECT, since we haven t really disconnected physically.

You can identify composite keys easily by looking in the INDEX_NAME column. If the same INDEX_NAME entry appears more than once, it s a composite key, and you can see the columns that are part of the key in the COLUMN_NAME column. For example, INVENTORY_PK is the primary key of the INVENTORIES table and is defined on two columns: PRODUCT_ID and WAREHOUSE_ID. You can glean the order of the two columns in a composite key by looking at the COLUMN_POSITION column.

The INDEX_STATS view is useful for seeing how efficiently an index is using its space. Large indexes have a tendency to become unbalanced over time if many deletions are in the table (and therefore index) data. Your goal is to keep an eye on those large indexes with a view to keeping them balanced. Note that the INDEX_STATS view is populated only if the table has been analyzed by using the ANALYZE command, as follows: SQL> ANALYZE index hr.emp_name_ix VALIDATE STRUCTURE; Index analyzed. The query in Listing 23-21 using the INDEX_STATS view helps determine if you need to rebuild the index. In the query, you should focus on the following columns in the INDEX_STATS view to determine if your index is a candidate for a rebuild: HEIGHT: This column refers to the height of the B-tree index, and it s usually at the 1, 2, or 3 level. If large inserts push the index height beyond a level of 4, it s time to rebuild, which flattens the B-tree. DEL_LF_ROWS: This is the number of leaf nodes deleted due to the deletion of rows. Oracle doesn t rebuild indexes automatically and, consequently, too many deleted leaf rows can lead to an unbalanced B-tree. BLK_GETS_PER_ACCESS: You can look at the BLK_GETS_PER_ACCESS column to see how much logical I/O it takes to retrieve data from the index. If this row shows a double-digit number, you should probably start rebuilding the index.

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