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Top Forums Shell Programming and Scripting Severe performance issue while 'grep'ing on large volume of data Post 302502126 by Souvik on Monday 7th of March 2011 01:38:24 AM
Old 03-07-2011
Severe performance issue while 'grep'ing on large volume of data

Background
-------------
The Unix flavor can be any amongst Solaris, AIX, HP-UX and Linux. I have below 2 flat files.

File-1
------
Contains 50,000 rows with 2 fields in each row, separated by pipe.
Row structure is like Object_Id|Object_Name, as following:

111|XXX
222|YYY
333|ZZZ

File-2
------
Contains 5,000 rows with a single field in each row.
Each row basically represents a filename with full path, as below:

/app00/applmgr/aprod/appl/au/11.5.0/resource/XXAIMG_CUSTOM_11I.pld
/app00/applmgr/aprod/appl/xbol/11.5.0/forms/US/XXARTLONG.fmt
/app00/applmgr/aprod/appl/au/11.5.0/resource/XXINVIVCSU.pld

Task
-----
I need to search for the occurances of each Object_Name (from each row of File-1) in all the 5000 distinct files (names stored in File-2) and get the search results stored in some 3rd file with below row structure. So the total no of loop iterations would be 250,000,000.

File_Name|Object_Id|Occurance_Count
eg,
/app00/applmgr/aprod/appl/au/11.5.0/resource/XXINVIVCSU.pld|222|13

Request
---------
Please provide the shell scripting method to do the desired job in fastest possible time.

Thanks,
Souvik.

Last edited by Souvik; 03-07-2011 at 02:45 AM..
 

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DB2_NUM_ROWS(3) 							 1							   DB2_NUM_ROWS(3)

db2_num_rows - Returns the number of rows affected by an SQL statement

SYNOPSIS
int db2_num_rows (resource $stmt) DESCRIPTION
Returns the number of rows deleted, inserted, or updated by an SQL statement. To determine the number of rows that will be returned by a SELECT statement, issue SELECT COUNT(*) with the same predicates as your intended SELECT statement and retrieve the value. If your application logic checks the number of rows returned by a SELECT statement and branches if the number of rows is 0, consider modi- fying your application to attempt to return the first row with one of db2_fetch_assoc(3), db2_fetch_both(3), db2_fetch_array(3), or db2_fetch_row(3), and branch if the fetch function returns FALSE. Note If you issue a SELECT statement using a scrollable cursor, db2_num_rows(3) returns the number of rows returned by the SELECT state- ment. However, the overhead associated with scrollable cursors significantly degrades the performance of your application, so if this is the only reason you are considering using scrollable cursors, you should use a forward-only cursor and either call SELECT COUNT(*) or rely on the boolean return value of the fetch functions to achieve the equivalent functionality with much better perfor- mance. PARAMETERS
o $stmt - A valid stmt resource containing a result set. RETURN VALUES
Returns the number of rows affected by the last SQL statement issued by the specified statement handle. PHP Documentation Group DB2_NUM_ROWS(3)
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