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It looked simple and bulletproof (to the developer anyway): if the count came back as zero, the room was yours. If it came back as nonzero, you could not reserve the room for that period. Once I knew what his logic was, I set up a very simple test to show him the error that would occur when the application went live an error that would be incredibly hard to track down and diagnose after the fact. Someone would be convinced it must be a database bug. All I did was get someone else to use the terminal next to him. Both he and the other person navigated to the same screen and, on the count of three, each clicked the Go button and tried to reserve the same room for about the same time one from 3:00 pm to 4:00 pm and the other from 3:30 pm to 4:00 pm. Both people got the reservation. The logic that worked perfectly in isolation failed in a multiuser environment. The problem in this case was caused in part by Oracle s non-blocking reads. Neither session ever blocked the other session. Both sessions simply ran the query and then performed the logic to schedule the room. They could both run the query to look for a reservation, even if the other session had already started to

You can use the DBA_TABLES view to find out things such as whether table compression and row-level dependency tracking are enabled, and whether the table has been dropped and is in the Recycle Bin.

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It is pretty straightforward to see how much redo is being generated, as shown earlier in the chapter. I ve used the AUTOTRACE built-in feature of SQL*Plus. But AUTOTRACE works only with simple DML it can t, for example, be used to view what a stored procedure call did. I ve also used my utility function presented above, GET_STAT_VAL, to retrieve the redo size value from V$ tables. We ll continue to use that function for the following exercise. Let s take a look at the difference in redo generated by conventional path INSERTs (the normal INSERTs you and I do every day) and direct-path INSERTs used when loading large amounts of data into the database. We ll use AUTOTRACE and the previously created tables T and BIG_TABLE for this simple example. First we ll load the table using a conventional-path INSERT: ops$tkyte%ORA11GR2> set autotrace traceonly statistics; ops$tkyte%ORA11GR2> truncate table t; Table truncated. ops$tkyte%ORA11GR2> insert into t 2 select * from big_table;

The DBA_EXTERNAL_TABLES view shows details about any external tables in a database, including their access type, access parameters, and directory information.

Hash clustered tables: These tables are similar to clustered tables, but instead of using a B*Tree index to locate the data by cluster key, the hash cluster hashes the key to the cluster to arrive at the database block the data should be on In a hash cluster, the data is the index (metaphorically speaking) These tables are appropriate for data that is read frequently via an equality comparison on the key Sorted hash clustered tables: This table type is new in Oracle 10g and combines some aspects of a hash clustered table with those of an IOT The concept is as follows: you have some key value that rows will be hashed by (say, CUSTOMER_ID), and then a series of records related to that key that arrive in sorted order (timestamp-based records) and are processed in that sorted order.

1000000 rows created. Statistics ---------------------------------------------------------2963 recursive calls 133438 db block gets 44024 consistent gets 15218 physical reads 122853436 redo size 932 bytes sent via SQL*Net to client 1006 bytes received via SQL*Net from client 4 SQL*Net roundtrips to/from client 4 sorts (memory) 0 sorts (disk) 1000000 rows processed As you can see, that INSERT generated about 122MB of redo; we were expecting that because of the prior example in PL/SQL.

The DBA_TAB_PARTITIONS view is similar to the DBA_TABLES view, but it provides detailed information about table partitions. You can get information about the partition name, partition high values, partition storage information, and partition statistics, plus all the other information that s available from the DBA_TABLES view. Listing 7-21 shows a simple query using the DBA_TAB_PARTITIONS view.

Listing 7-21. Querying the DBA_TAB_PARTITIONS View SQL> SELECT table_name, partition_name, 2 high_value, 3* FROM DBA_TAB_PARTITIONS;

Note The example in this section was performed on a NOARCHIVELOG-mode database. If you are in ARCHIVELOG

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