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There are two ways to set alert thresholds: you can specify that the database alert be based on the percent of space used or on the number of free bytes left in the tablespace: Percent full: The database issues an alert when the space used in a tablespace reaches or crosses a preset percentage of total space. For a new database, 85 percent full is the threshold for the warning alerts, and 97 percent full is the threshold for the critical alerts. You can, if you wish, change these values and set, for example, 90 and 98 percent as the warning and critical thresholds. Bytes remaining: When the free space falls below a certain amount (specified in KB), Oracle issues an alert. For example, you can use a warning threshold of 10,240KB and a critical threshold of 4,096KB for a tablespace. By default, the bytes remaining alerts (both warning and critical) in a new database are disabled, since the defaults for both types of bytesremaining thresholds are set to zero. You can set them to a size you consider appropriate for each tablespace.

The READ UNCOMMITTED isolation level allows dirty reads. Oracle does not make use of dirty reads, nor does it even allow for them. The basic goal of a READ UNCOMMITTED isolation level is to provide a standards-based definition that caters for non-blocking reads. As we have seen, Oracle provides for non-blocking reads by default. You would be hard-pressed to make a SELECT query block in the database (as noted earlier, there is the special case of a distributed transaction). Every single query, be it a SELECT, INSERT, UPDATE, MERGE, or DELETE, executes in a read-consistent fashion. It might seem funny to refer to an UPDATE statement as a query but it is. UPDATE statements have two components: a read component as defined by the WHERE clause and a write component as defined by the SET clause. UPDATE statements read from and write to the database as do all DML statements. The special case of a single row INSERT using the VALUES clause is the only exception to this, as such statements have no read component, just the write component. In 1, Oracle s method of obtaining read consistency was demonstrated by way of a simple single table query, which retrieved rows that were deleted after the cursor was opened. We re now going to explore a real-world example to see what happens in Oracle using multi-versioning, as well as what happens in any number of other databases. Let s start with the same basic table and query: create table accounts ( account_number number primary key, account_balance number not null ); select sum(account_balance) from accounts; Before the query begins, we have the data shown in Table 7-2. Table 7-2. ACCOUNTS Table Before Modifications

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As I mentioned in the previous sections, locking in Oracle is usually done implicitly by Oracle itself, at the least restrictive level. Users can override Oracle s default locking behavior, but you probably won t find too many cases where you re dealing with user-managed locks. Most of your lock management on a live database will involve checking whether any active locks are actually blocking users from conducting their DML operations. You can use either a script-based approach or the Oracle Enterprise Manager to analyze locks in your instance.

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It s possible to examine the current locking situation in your instance by using SQL scripts. You may have to first run the catblock.sql script, located in the $ORACLE_HOME/rdbms/admin directory, before executing any locking-related SQL scripts for the first time in a database. This script will create several important locking-related views, such as DBA_LOCKS, DBA_WAITERS, and DBA_BLOCKERS. Oracle provides a script called utllockt.sql that gives you a lock wait-for graph in a tree-structured format showing sessions that are holding locks that are affecting other sessions. Using this script, you can see what locks a session may be waiting for and which session is holding the lock. The script is located in the $ORACLE_HOME/rdbms/admin directory. Here s a sample execution of the utllockt.sql script: SQL> @$ORACLE_HOME/rdbmsa/admin/utllockt.sql Waiting session Type Mode requested Mode Held Lock Id1 ------------------------------------------------------------------------682 None None None 0 363 TX Share (S) Exclusive (X)

1 2 ... 342,023

The utllockt.sql script prints the sessions in the system that are waiting for locks, and the locks that they are waiting for. The printout is tree-structured. If a session ID is printed immediately below and to the right of another session, then it is waiting for that session. The session IDs printed at the left side of the page are the sessions everyone is waiting for.

Figure 9-18. A blood-pressure-measurement machine using an interruptible transparent interaction As pressurization is in progress, SysCom makes frequent status requests to obtain the instantaneous blood-pressure reading. The strap pressure needs to be increased until StrapCom can read a

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