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In the preceding example, the session ID on the left side, 682, is what session 363 is waiting for. The information printed to the right of each session shows information about the lock it s waiting for. Thus, session 682, although it s holding a lock, doesn t show anything (None) in the lockinformation columns because it isn t waiting for any lock. Session 363, however, tells you that it has requested a share (S) lock and is waiting for session 682 to release its exclusive (X) lock on the table row. In the following example from the utllockt.sql script, session 9 is waiting for session 8, session 7 is waiting for session 9, and session 10 is waiting for session 9 as well. * WAITING SESSION * ----------------* 8 * 9 * 7 * 10 TYPE ---NONE TX RW RW MODE REQUESTED ----------------None Share (S) Exclusive (X) Exclusive (X) MODE HELD ----------------None Exclusive (X) S/Row-X (SSX) S/Row-X (SSX) LOCK ID1 LOCK ID2 -------- -------0 0 65547 16 33554440 2 33554440 2

123 456 ... 987

The lock information to the right of the session ID describes the lock that the session is waiting for (not the lock it is holding). The V$LOCK and the V$LOCK_HOLDERS views are very helpful in analyzing locks in your instance, but sometimes they take a long time to run. The V$SESSION view can provide a quick idea about the blocking sessions in your database. The BLOCKING_SESSION column of the V$SESSION view reveals the identity of the user who is holding the lock. The BLOCKING_SESSION_STATUS column shows whether the BLOCKING_SESSION data is valid or not. For example, if you find the value VALID in the BLOCKING_SESSION_STATUS column, it means that you ll find the SID of the blocking user under the BLOCKING_SESSION column. Here s a simple query that shows how to use the V$SESSION view to find out who is blocking a certain session:

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Now, our select statement starts executing and reads row 1, row 2, and so on. At some point while we are in the middle of the query, a transaction moves $400.00 from account 123 to account 987. This transaction does the two updates, but does not commit. The table now looks as shown in Table 7-3. Table 7-3. ACCOUNTS Table During Modifications

The V$SPPARAMETER view is useful only if you re using the SPFILE instead of the init.ora file. The view indicates the names of all parameters whether you re using an SPFILE or not, but the VALUE column is populated only if you re using an SPFILE.

heartbeat. If the pressure reaches a limit value before a heartbeat is detected, SysCom concludes that the strap wasn t placed around the arm correctly and issues an abort command to release the strap.

The V$NLS_PARAMETERS view contains the name and current value of all NLS parameters. Listing 23-36 shows you some of the common NLS parameters and their values. Listing 23-36. Using the V$NLS_PARAMETERS View SQL> SELECT * FROM V$NLS_PARAMETERS; PARAMETER VALUE -------------------------------------------NLS_LANGUAGE AMERICAN NLS_TERRITORY AMERICA NLS_CURRENCY $ NLS_ISO_CURRENCY AMERICA NLS_NUMERIC_CHARACTERS ., NLS_CALENDAR GREGORIAN NLS_DATE_FORMAT DD-MON-RR NLS_DATE_LANGUAGE AMERICAN NLS_CHARACTERSET WE8MSWIN1252 NLS_SORT BINARY NLS_TIME_FORMAT HH.MI.SSXFF AM SQL>

1 2 ... 342,023

You can set the initialization parameter STATISTICS_LEVEL at different levels to control the statistics your instance collects. The V$STATISTICS_LEVEL view provides you with the present level of all statistics and advisories based on the STATISTICS_LEVEL configuration value. In addition, the STATISTICS_VIEW_NAME column shows the dynamic performance view that holds the current statistics for each of the statistics being collected. Listing 23-37 shows the list of all statistics being collected or not collected in the system. Listing 23-37. Querying the V$STATISTICS_LEVEL View SQL> SELECT statistics_name, session_status, system_status, statistics_view_name FROM V$STATISTICS_LEVEL; STAT_NAME SESS_STATUS SYS_STATUS STATISTICS_VIEW_NAME -------------------------------- ---------------------------------Buffer Cache Advice ENABLED ENABLED $DB_CACHE_ADVICE MTTR Advice ENABLED ENABLED V$MTTR_TARGET_ADVICE Timed Statistics ENABLED ENABLED Timed OS Statistics DISABLED DISABLED Segment Level Statistics ENABLED ENABLED V$SEGSTAT PGA Advice ENABLED ENABLED V$PGA_TARGET_ADVICE Plan Execution Statistics DISABLED DISABLED V$SQL_PLAN_STATISTICS Shared Pool Advice ENABLED ENABLED V$SHARED_POOL_ADVICE Modification Monitoring ENABLED ENABLED Longops Statistics ENABLED ENABLED V$SESSION_LONGOPS Bind Data Capture ENABLED ENABLED V$SQL_BIND_CAPTURE Ultrafast Latch Statistics ENABLED ENABLED Threshold-based Alerts ENABLED ENABLED Global Cache Statistics ENABLED ENABLED Cache Stats Monitor ENABLED ENABLED

Context A process P1 wishes to transfer a large amount of information to a process P2. The information can be broken down into a series of messages. It may be necessary to stop the message flow before all the intended information is sent. P1, P2, or both may have control over when messages should stop being sent. Forces

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