Hi everyone!
I'm trying to create a database monitoring script that reads an alert file and sends an error message if it can 'grep' a particular string.
Is there a way to send this message to a mail client using SMTP?
Even better, is there any place on this site that has these kinds of... (5 Replies)
I am comparing two table structure in different databases,Put into 2 txt files , when comparing if column sequnce and data type is not matching ,it has to display that info else Table structure is ok.
wrote shell script ,its not working .I am getting "Table structure is not ok" even if both... (1 Reply)
Hi,
I have two databases with same tables on different servers.I need to check the data content in each table and if something is missing, should print that.
I have a tool which takes the snapshot the table structure,index so on and compares with the other server tables snapshot.
Now i need... (1 Reply)
Hi guys...
I am busy writing a script to notify me via an mail if my application is down. I have done that.
Now I want this script to stop sending mails after five mails were sent but the script should keep on checking the application.
When the application is up again that count should be... (5 Replies)
Hello all;
I have been really frustrated with finding the correct perl code (and MySql statements) to accomplish what I thought was straight forward...I have tested I don't know how many different codes\suggestions I found on the net without any success...but anyhow let me explain my plight and... (0 Replies)
I have 2 files that need to be compared. Email the differences if something is different and don't email if nothing is different. One or both of the files could be empty. One or both could have data in them.
example files
backup.doc.$(date +%y%m%d) file size is 0
backup.doc.$(TZ=CST+24... (4 Replies)
Whats the difference between mail and mailx?
I'm trying to troubleshoot a problem where I can send mail from server A with this `echo $MESSAGE | mail -s "$SUBJECT" -r $FROM $RECIPIENTS` command but executing the same command from server B throws me this error (Both servers are RHEL)
... (1 Reply)
Hi,
I have txt file below
02.05.2014,10.05.2014,dfs,srtytr,tyhty
05.10.2014,15.10.2014,456ef,t6y5fgtd,xg45t
21.11.2014,28.11.2014,sefser,dfw344,zsdfrw
22.12.2014,30.12.2014,fwe,aerw4,zwq4q
my script will ask two input,
enter start date
05.10.2014
enter end date... (3 Replies)
my queryis :
select distinct m.name, item_count, item from master m join client p on m.name=p.name where item_count = 1 and item > 1;
But how should I update them?
i used update statetment :
Update from client Set item =1 where m.name=p.name and item_count=1 AND item>1
Is this wrong? (1 Reply)
I have defined a set of global variables at the beginning of my script as below:
#ideal values
export ITEM1=SUCCESS
export ITEM2=FAILURE
export ITEM3=UNAVAILABLE
export ITEM5=FAILURE
export ITEM6=SUCCESS
now I have a shell script function which returns a value in below format.
ITEM1... (1 Reply)
Discussion started by: ctrld
1 Replies
LEARN ABOUT REDHAT
cluster
CLUSTER(7) SQL Commands CLUSTER(7)NAME
CLUSTER - cluster a table according to an index
SYNOPSIS
CLUSTER indexname ON tablename
INPUTS
indexname
The name of an index.
table The name (possibly schema-qualified) of a table.
OUTPUTS
CLUSTER
The clustering was done successfully.
DESCRIPTION
CLUSTER instructs PostgreSQL to cluster the table specified by table based on the index specified by indexname. The index must already have
been defined on tablename.
When a table is clustered, it is physically reordered based on the index information. Clustering is a one-time operation: when the table is
subsequently updated, the changes are not clustered. That is, no attempt is made to store new or updated tuples according to their index
order. If one wishes, one can periodically re-cluster by issuing the command again.
NOTES
In cases where you are accessing single rows randomly within a table, the actual order of the data in the heap table is unimportant. How-
ever, if you tend to access some data more than others, and there is an index that groups them together, you will benefit from using CLUS-
TER.
Another place where CLUSTER is helpful is in cases where you use an index to pull out several rows from a table. If you are requesting a
range of indexed values from a table, or a single indexed value that has multiple rows that match, CLUSTER will help because once the index
identifies the heap page for the first row that matches, all other rows that match are probably already on the same heap page, saving disk
accesses and speeding up the query.
During the cluster operation, a temporary copy of the table is created that contains the table data in the index order. Temporary copies of
each index on the table are created as well. Therefore, you need free space on disk at least equal to the sum of the table size and the
index sizes.
CLUSTER preserves GRANT, inheritance, index, foreign key, and other ancillary information about the table.
Because the optimizer records statistics about the ordering of tables, it is advisable to run ANALYZE on the newly clustered table. Other-
wise, the optimizer may make poor choices of query plans.
There is another way to cluster data. The CLUSTER command reorders the original table using the ordering of the index you specify. This can
be slow on large tables because the rows are fetched from the heap in index order, and if the heap table is unordered, the entries are on
random pages, so there is one disk page retrieved for every row moved. (PostgreSQL has a cache, but the majority of a big table will not
fit in the cache.) The other way to cluster a table is to use
SELECT columnlist INTO TABLE newtable
FROM table ORDER BY columnlist
which uses the PostgreSQL sorting code in the ORDER BY clause to create the desired order; this is usually much faster than an index scan
for unordered data. You then drop the old table, use ALTER TABLE...RENAME to rename newtable to the old name, and recreate the table's
indexes. However, this approach does not preserve OIDs, constraints, foreign key relationships, granted privileges, and other ancillary
properties of the table --- all such items must be manually recreated.
USAGE
Cluster the employees relation on the basis of its ID attribute:
CLUSTER emp_ind ON emp;
COMPATIBILITY
SQL92
There is no CLUSTER statement in SQL92.
SQL - Language Statements 2002-11-22 CLUSTER(7)