05-13-2013
Thanks got it!!
Since you are inserting the data and not updating it I dont think you need table level exclusive lock. Insert will have its own row level lock which is sufficient.
Table level locks are usually applied when you want to update some data and make sure user access the updated data only..
10 More Discussions You Might Find Interesting
1. UNIX for Dummies Questions & Answers
Hi...
after unlock my computer from lock,
all telnet windows which i opened previously are closing automaticaly...
i hope u understand....plz give solution... (1 Reply)
Discussion started by: venkatramana
1 Replies
2. Shell Programming and Scripting
Hey guys/gals,
So here is what i'm starting with...its a Solaris patch diag output.
bash-3.0# pca -l
Using /var/tmp/patchdiag.xref from Oct/20/08
Host: seiftsx4140 (SunOS 5.10/Generic_127128-11/i386/i86pc)
List: missing
Patch IR CR RSB Age Synopsis
------ -- - -- --- ---... (3 Replies)
Discussion started by: zeekblack
3 Replies
3. Shell Programming and Scripting
Hi
I am having three oracle databases running in three different machine. their ip address is different. from one of the DB am able to access both the databases.(means am able to select values and insert values in to tables individually.)
I need to fetch some data from DB1 table(say DB1 ip is... (2 Replies)
Discussion started by: aemunathan
2 Replies
4. Shell Programming and Scripting
Hi,
I am trying to insert a record into a table (say dips_tbl) which resides in Oracle DB through a ksh script. I want to insert records into few of the table columns-not all. I'll give an e.g. for the date column "CREATE_DATE".
For that I first execute
SQL1="SELECT SYSDATE FROM DUAL"
... (1 Reply)
Discussion started by: dips_ag
1 Replies
5. Shell Programming and Scripting
I have a file like below
Iter 1: Best Model = 10.0 12.0 13.0 17.0 23.3 78.7
Iter 2: Best Model = 10.0 20.0 30.0 40.0 50.0 60.0
Iter 3: Best Model = 27.3 46.3 84.5 23.0 34.5 35.4
etc
I want to use a scipts using csh or awk to select the iteration number and show the numbers in a table... (2 Replies)
Discussion started by: kristinu
2 Replies
6. Shell Programming and Scripting
Hi folks
I am trying to use a call to a python command within a shell script to help validate a date. If I hard code the date to be checked in the string it works. As follows
cmd_result=$(/usr/bin/python -c 'import time; print time.strftime("%d",time.strptime("31/02/2008", "%d/%m/%Y"))'... (2 Replies)
Discussion started by: PatMcDonagh
2 Replies
7. UNIX for Dummies Questions & Answers
Hello,
I'm working with putty on Windows 7 professional and I'd like to know if there's a way to gather specific lines from a pre-existing table and make a new table with that information.
More specifically, I'd like the program to look at a specific column, say column N, and see if any of the... (5 Replies)
Discussion started by: Deedee393
5 Replies
8. Programming
Hi,
i have a java based tool which does insert operation in a TABLE, and in parallel the same table is used by my C++ code which does select Query.
the Table will be always busy, but sometimes the table is getting locked when i try to make an insert, am bit confused whether the lock is... (0 Replies)
Discussion started by: senkerth
0 Replies
9. Shell Programming and Scripting
Hello,
Objective is to insert bulk values in DB table using isql.
Following code tried:
isql -SServer_name -Ddb_name -Uuser_name -Ppassword < file.txt
cat file.txt
for i in `cat data_value_file.txt`
do
insert into tempdb..temp_table11 values ('$i')
go
done
cat... (3 Replies)
Discussion started by: manishdivs
3 Replies
10. Shell Programming and Scripting
I have a problem with my shell script. I want to insert data from file to table1(empty) and then, compare table1 with table2 and update some fields.
The first part is correct, but the second part does not work. The only way it works is if after the first part I truncate table1 and run the script... (1 Reply)
Discussion started by: nika_mill
1 Replies
FLOCK(2) BSD System Calls Manual FLOCK(2)
NAME
flock -- apply or remove an advisory lock on an open file
SYNOPSIS
#include <sys/file.h>
#define LOCK_SH 1 /* shared lock */
#define LOCK_EX 2 /* exclusive lock */
#define LOCK_NB 4 /* don't block when locking */
#define LOCK_UN 8 /* unlock */
int
flock(int fd, int operation);
DESCRIPTION
Flock() applies or removes an advisory lock on the file associated with the file descriptor fd. A lock is applied by specifying an operation
parameter that is one of LOCK_SH or LOCK_EX with the optional addition of LOCK_NB. To unlock an existing lock operation should be LOCK_UN.
Advisory locks allow cooperating processes to perform consistent operations on files, but do not guarantee consistency (i.e., processes may
still access files without using advisory locks possibly resulting in inconsistencies).
The locking mechanism allows two types of locks: shared locks and exclusive locks. At any time multiple shared locks may be applied to a
file, but at no time are multiple exclusive, or both shared and exclusive, locks allowed simultaneously on a file.
A shared lock may be upgraded to an exclusive lock, and vice versa, simply by specifying the appropriate lock type; this results in the pre-
vious lock being released and the new lock applied (possibly after other processes have gained and released the lock).
Requesting a lock on an object that is already locked normally causes the caller to be blocked until the lock may be acquired. If LOCK_NB is
included in operation, then this will not happen; instead the call will fail and the error EWOULDBLOCK will be returned.
NOTES
Locks are on files, not file descriptors. That is, file descriptors duplicated through dup(2) or fork(2) do not result in multiple instances
of a lock, but rather multiple references to a single lock. If a process holding a lock on a file forks and the child explicitly unlocks the
file, the parent will lose its lock.
Processes blocked awaiting a lock may be awakened by signals.
RETURN VALUES
Zero is returned if the operation was successful; on an error a -1 is returned and an error code is left in the global location errno.
ERRORS
The flock() call fails if:
[EWOULDBLOCK] The file is locked and the LOCK_NB option was specified.
[EBADF] The argument fd is an invalid descriptor.
[EINVAL] The argument fd refers to an object other than a file.
[ENOTSUP] The referenced descriptor is not of the correct type.
SEE ALSO
close(2), dup(2), execve(2), fork(2), open(2)
HISTORY
The flock() function call appeared in 4.2BSD.
4.2 Berkeley Distribution December 11, 1993 4.2 Berkeley Distribution