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9 CTX_OUTPUT Package

This chapter provides reference information for using the CTX_OUTPUT PL/SQL package.

CTX_OUTPUT contains the following stored procedures:

Name Description
ADD_EVENT Add an event to the index log.
ADD_TRACE Enable tracing.
END_LOG Halt logging of index and document services requests.
END_QUERY_LOG Stop logging queries into a logfile.
GET_TRACE_VALUE Return the value of a trace.
LOG_TRACES Print traces to logfile.
LOGFILENAME Return the name of the current log file.
REMOVE_EVENT Remove an event from the index log.
REMOVE_TRACE Disable tracing.
RESET_TRACE Clear a trace.
START_LOG Start logging index and document service requests.
START_QUERY_LOG Create a log file of queries.


ADD_EVENT

Use this procedure to add an event to the index log for more detailed log output.

Syntax

CTX_OUTPUT.ADD_EVENT(event in NUMBER);
event

Specify the type of index event to log. You can add the following events:

  • CTX_OUTPUT.EVENT_INDEX_PRINT_ROWID, which logs the rowid of each row after it is indexed. This is useful for debugging a failed index operation.

  • CTX_OUTPUT.EVENT_OPT_PRINT_TOKEN, which prints each token as it is being optimized.

  • CTX_OUTPUT.EVENT_INDEX_PRINT_TOKEN, which prints the each token as it is being indexed.

Example

begin
CTX_OUTPUT.ADD_EVENT(CTX_OUTPUT.EVENT_INDEX_PRINT_ROWID);
end;

Related Topics


See Also:

REMOVE_EVENT


ADD_TRACE

Use this procedure to enable a trace. If the trace has not been enabled, this call adds the trace to the list of active traces and resets its value to 0. If the trace has already been enabled, an error is raised.

Syntax

CTX_OUTPUT.ADD_TRACE(trace_id BINARY_INTEGER);
trace_id

Specify the ID of the trace to enable. See Table 9-1 for possible trace values.

Notes

Table 9-1 shows the available traces:

Table 9-1 Available Traces

Symbol ID Metric
TRACE_IDX_USER_DATASTORE 1 time spent executing user datastore
TRACE_IDX_AUTO_FILTER 2 time spent invoking the AUTO_FILTER filter. (Replaces the deprecated TRACE_IDX_INSO_FILTER trace)
TRACE_QRY_XX_TIME 3 time spent executing the $X cursor
TRACE_QRY_XF_TIME 4 time spent fetching from $X
TRACE_QRY_X_ROWS 5 total number of rows whose token metadata was fetched from $X
TRACE_QRY_IF_TIME 6 time spent fetching the LOB locator from $I
TRACE_QRY_IR_TIME 7 time spent reading $I LOB information
TRACE_QRY_I_ROWS 8 number of rows whose $I token_info was actually read
TRACE_QRY_I_SIZE 9 number of bytes read from $I LOBs
TRACE_QRY_R_TIME 10 time spent fetching and reading $R information
TRACE_QRY_CON_TIME 11 time spent in CONTAINS processing (drexrcontains/drexrstart/drexrfetch)

Tracing is independent of logging. Logging does not have to be on to start tracing, and vice-versa.

Traces are associated with a session—they can measure operations that take place within a single session, and conversely, cannot make measurements across sessions.

During parallel sync or optimize, the trace profile will be copied to the slave sessions if and only if tracing is currently enabled. Each slave will accumulate its own traces and implicitly write all trace values to the slave logfile before termination.

Related Topics


END_LOG

Halt logging index and document service requests

Syntax

CTX_OUTPUT.END_LOG;

Example

begin
CTX_OUTPUT.END_LOG;
end;

END_QUERY_LOG

Use this procedure to stop logging queries into a logfile created with CTX_OUTPUT.START_QUERY_LOG.

Syntax

CTX_OUTPUT.END_QUERY_LOG;

Example

begin
CTX_OUTPUT.START_QUERY_LOG('mylog1');
     < get queries >
CTX_OUTPUT.END_QUERY_LOG;
end;

GET_TRACE_VALUE

Use this procedure to programmatically retrieve the current value of a trace.

Syntax

CTX_OUTPUT.GET_TRACE_VALUE(trace_id BINARY_INTEGER);
trace_id

Specify the trace ID whose value you want. See Table 9-1, "Available Traces" for possible values.

Example

This sets the value of the variable value:

value := ctx_output.get_trace_value(trace_id);

Notes

You can also retrieve trace values through SQL:

select * from ctx_trace_values;

See "CTX_TRACE_VALUES" for the entries in the CTX_TRACE_VALUES view.

If the trace has not been enabled, an error is raised.

Traces are not reset to 0 by this call.

Traces are associated with a session—they can measure operations that take place within a single session, and conversely, cannot make measurements across sessions.

Related Topics


LOG_TRACES

Use this procedure to print all active traces to the logfile.

Syntax

CTX_OUTPUT.LOG_TRACES;

Notes

If logging has not been started, an error is raised.

Traces are not reset to 0 by this call.

This procedure looks for the logfile in the directory specified by the LOG_DIRECTORY system parameter, which is $ORACLE_HOME/ctx/log on UNIX. You can query the CTX_PARAMETERS view to find the current setting.

Related Topics


LOGFILENAME

Returns the filename for the current log. This procedure looks for the logfile in the directory specified by the LOG_DIRECTORY system parameter, which is $ORACLE_HOME/ctx/log on UNIX. You can query the CTX_PARAMETERS view to find the current setting.

Syntax

CTX_OUTPUT.LOGFILENAME RETURN VARCHAR2;

Returns

Log file name.

Example

declare
   logname varchar2(100);
begin
   logname := CTX_OUTPUT.LOGFILENAME;
   dbms_output.put_line('The current log file is: '||logname); 
end;

REMOVE_EVENT

Use this procedure to remove an event from the index log.

Syntax

CTX_OUTPUT.REMOVE_EVENT(event in NUMBER);
event

Specify the type of index event to remove from the log. You can remove the following events:

  • CTX_OUTPUT.EVENT_INDEX_PRINT_ROWID, which logs the rowid of each row after it is indexed. This is useful for debugging a failed index operation.

  • CTX_OUTPUT.EVENT_OPT_PRINT_TOKEN, which prints each token as it is being optimized.

  • CTX_OUTPUT.EVENT_INDEX_PRINT_TOKEN, which prints the each token as it is being indexed.

Example

begin
CTX_OUTPUT.REMOVE_EVENT(CTX_OUTPUT.EVENT_INDEX_PRINT_ROWID);
end;

Related Topics


See Also:

ADD_EVENT


REMOVE_TRACE

Use this procedure to disable a trace.

Syntax

CTX_OUTPUT.REMOVE_TRACE(trace_id BINARY_INTEGER);
trace_id

Specify the ID of the trace to disable. See Table 9-1, "Available Traces" for possible values.

Notes

If the trace has not been enabled, an error is raised.

Related Topics


RESET_TRACE

Use this procedure to clear a trace (that is, reset it to 0).

Syntax

CTX_OUTPUT.RESET_TRACE(trace_id BINARY_INTEGER);
trace_id

Specify the ID of the trace to reset. See Table 9-1, "Available Traces" for possible values.

Notes

If the trace has not been enabled, an error is raised.

Related Topics


START_LOG

Begin logging index and document service requests.

Syntax

CTX_OUTPUT.START_LOG(logfile in varchar2, overwrite in default true);
logfile

Specify the name of the log file. The log is stored in the directory specified by the system parameter LOG_DIRECTORY.

overwrite

Specify whether you want to overwrite or append to the original query log file specified by logfile, if it already exists. The default is to overwrite the original query log file.

Example

begin
CTX_OUTPUT.START_LOG('mylog1');
end;

Notes

Logging is independent of tracing. Logging does not have to be on to start tracing, and vice-versa.

Logging is associated with a session—it can log operations that take place within a single session, and, conversely, cannot make measurements across sessions.

Filenames used in CTX_OUTPUT.START_LOG are restricted to the following characters: alphanumeric, minus, period, space, hash, underscore, single and double quotes. Any other character in the filename will raise an error.


START_QUERY_LOG

Begin logging query requests into a query log file.

Use CTX_OUTPUT.END_QUERY_LOG to stop logging queries. Use CTX_REPORT.QUERY_LOG_SUMMARY to obtain reports on logged queries, such as which queries returned successfully the most times.

The query log includes the query string, the index name, and the timestamp of the query, as well as whether or not the query successfully returned a hit. A successful query for the phrase Blues Guitarists made at 6:46 (local time) on November 11th, 2003, would be entered into the query log in this form:

<QuerySet><TimeStamp>18:46:51 02/04/03</TimeStamp><IndexName>
IDX_SEARCH_TABLE</IndexName><Query>Blues
Guitarists</Query><ReturnHit>Yes</ReturnHit></QuerySet>

Syntax

CTX_OUTPUT.START_QUERY_LOG(logfile in varchar2, overwrite in default true);
logfile

Specify the name of the query log file. The query log is stored in the directory specified by the system parameter LOG_DIRECTORY.

overwrite

Specify whether you want to overwrite or append to the original query log file specified by logfile, if it already exists. The default is to overwrite the original query log file.

Example

begin
CTX_OUTPUT.START_QUERY_LOG('mylog1');
     < get queries >
CTX_OUTPUT.END_QUERY_LOG;
end;

Notes

Filenames used in CTX_OUTPUT.START_QUERY_LOG are restricted to the following characters: alphanumeric, minus, period, space, hash, underscore, single and double quotes. Any other character in the filename will raise an error.

Logging is associated with a session—it can log operations that take place within a single session, and, conversely, cannot make measurements across sessions.