I'm trying to use mysqldump to backup my databases - data and all. I can use this command to dump the data on the command line:
mysqldump -u username -ppassword --skip-lock-tables --databases database
That works great, and I have a full mass insert statement with all the data. if I do this however:
mysqldump -u username -ppassword --skip-lock-tables --databases database > /var/backup/$(date +\%d-\%m-\%Y)_dump.sql
to add the output to a file (I've checked that the file name scheme works), I only get the create and update commands, and one row of data for each table. I've also tried this without --skip-lock-tables, but I wanted to make sure this wasn't a problem with getting a lock. This will eventually go into a cron job, so I'd like to be able to keep this to one line if possible.
The output on the command line is quite long, but here is an example of part of the mass insert statement:
/*!40000 ALTER TABLE `clients` DISABLE KEYS */;
INSERT INTO `clients` VALUES (1,'nicholas','sallis','it#konditormeister.com','11 hunnewell circle ','newton','02458','ma','7818491970','2016-05-10 16:17:55','2016-05-10 16:17:55')
Related
I have file1.sh file and which internally needs to execute one sql query against two Oracle DBs at a same time and needs to export date to csv fiiles, below is the sample shellscript which executes the query against two dbs.
....
#!bin/bash
set -X
sqlplus -S ${user1}#${DBCONNECTIONNAME_1}/${Pwd} Datesquery.sql & >> ${Targetdirectory}/csvfile1.csv
sqlplus -S ${user1}#${DBCONNECTIONNAME_2}/${Pwd} Datesquery.sql & >> ${Targetdirectory}/csvfile2.csv
sed 1d csvfile2.csv > file2noheader.csv
cat csvfile1.csv file2noheader.csv > ${Targetdirectory}/Expod.csv
....
But it does not connect to DB and does not execute any query and simply displays sqlplus manual as how to use the connection string, please let me know how to call one query against two dbs and execute them in parrallay and binds output to separate csv files.
A given sqlplus session can only connect to one db at a time, so your requirement 'at the same time' is essentially a non-starter. If 'at the same time' really means 'sequentially, in the same script, then you are back to fixing your connect string. And at that you 'have more errors than an early Mets game' (with apologies to any NY Mets fans).
First, your script indicates that your sqlplus command is the very first actual command following specification of your shell processor and 'set -x'. Yet you make heavy use of environment variables as substitutions for username, password, and connection name - without ever setting those variables.
Second, your use of an '&' in the command line is totally confusing to both me and the parser.
Third, you need to preceed your reference to the sql script with '#'.
Fourth, your order of elements in the command line is all wrong.
Try this
#!/bin/bash
orauser1=<supply user name here>
orapw2=<supply password here>
oradb_1=<supply connection name of first database>
#
orauser1=<supply user name here>
orapw2=<supply password here>
oradb_1=<supply connection name of first database>
#
Targetdirectory=<supply value here>
#
sqlplus -S ${orauser1}/${orapw1}#${oradb_1} #Datesquery.sql >> ${Targetdirectory}/csvfile1.csv
sqlplus -S ${orauser2}/${orapw2}#${oradb_1} #Datesquery.sql >> ${Targetdirectory}/csvfile2.csv
Or create a database link form one DB to other and then run both sqls in one db, one over DB link.
select * from tab1
union
select * from tab1#db_link
I am trying to alter my cassandra tables starting with a specific name.
My table starts with sample_1,sample_2,sample_13567,sample_adgf and so on...
The table names are random but starting with same prefix.
I want to add a new column to all these tables.
Can some one suggest me the update query using the regex for table names.
If you are using linux You can this in two step :
First Generate all alter command into a file like below :
for i in {1..13567}; do echo "ALTER TABLE sample_$i ADD test text;"; done > alter.cql
The above command will create alter command to add test text column for table sample_1 to sample_13567 and store into a file alter.cql
Now you can just load the cql file into cqlsh like below :
cqlsh 127.0.0.1 -u cassandra -p cassandra -k ashraful_test -f alter.cql
Here
-u username
-p password
-k keyspace_name
-f file name to load
By the way having too much table is not a good idea.
Check this link https://stackoverflow.com/a/33389204/2320144
I am getting "relation does not exist" error while trying to truncate a particular table.The table actually exists in the database.
Also when I click on this table in pg admin I get the warning for vacuum.
Are these things related.?
------ Adding few more details----
Truncate statement is called within a greenplum function. This job truncates and load the table on a daily basis(This table is queried in reports)The issue pops up once in a while and if we go and restart the same job again after few minutes it succeeds.
Please try to do the below select * from schemaname.tablename limit 10; If you don't use the schema name then you have to set the search path as below and then run your select
set search_path=schemaname;
I have a Cassandra 2.1.8 database with a bunch of tables, all in the form of either "prefix1_tablename" or "prefix2_tablename".
I want to DROP every table that begins with prefix1_ and leave anything else alone.
I know I can grab table names using the query:
SELECT columnfamily_name FROM system.schema_columnfamilies
WHERE keyspace_name='mykeyspace'
And I thought about filtering the results somehow to get only prefix1_ tables, putting them into a table with DROP TABLE prepended to each one, then executing all the statements in my new table. It was similar thinking to strategies I've seen for people solving the same problem with MySQL or Oracle.
With CQL3.2 though, I don't have access to User-Defined Functions (at least according to the docs I've read...) and I don't know how to do something like execute statements off of a table query result, as well as even how to filter out prefix1_ tables with no LIKE operator in Cassandra.
Is there a way to accomplish this?
I came up with a Bash shell script to solve my own issue. Once I realized that I could export the column families table to a CSV file, it made more sense to me to perform the filtering and text manipulation with grep and awk as opposed to finding a 'pure' cqlsh method.
The script I used:
#!/bin/bash
# No need for a USE command by making delimiter a period
cqlsh -e "COPY system.schema_columnfamilies (keyspace_name, columnfamily_name)
TO 'alltables.csv' WITH DELIMITER = '.';"
cat alltables.csv | grep -e '^mykeyspace.prefix1_' \
| awk '{print "DROP TABLE " $0 ";"}' >> remove_prefix1.cql
cqlsh -f 'remove_prefix1.cql'
rm alltables.csv remove_prefix1.cql
I want to copy selected rows from a columnfamily to a .csv file. The copy command is available just to dump a column or entire table to a file without where clause. Is there a way to use where clause in copy command?
Another way I thought of was,
Do "Insert into table2 () values ( select * from table1 where <where_clause>);" and then dump the table2 to .csv , which is also not possible.
Any help would be much appreciated.
There are no way to make a where clause in copy, but you can use this method :
echo "select c1,c2.... FROM keySpace.Table where ;" | bin/cqlsh > output.csv
It allows you to save your result in the output.csv file.
No, there is no built-in support for a "where" clause when exporting to a CSV file.
One alternative would be to write your own script using one of the drivers. In the script you would do the "select", then read the results and write out to a CSV file.
In addition to Amine CHERIFI's answer:
| sed -e 's/^\s+//; s_\s*\|\s*_,_g; /^-{3,}|^$|^\(.+\)$/d'
Removes spaces
Replaces | with ,
Removes header separator, empty and summary lines
Other ways to run the SQL with filter and redirect the response to csv
1) Inside the cqlsh, use the CAPTURE command and redirect the output to a file. You need to set the tracing on before executing the command
Example: CAPTURE 'output.txt' -- output of the sql executed after this command gets captured into output.txt file
2) In case if you would like to redirect the SQL output to a file from outside of cqlsh
./cqlsh -e'select * from keyspaceName.tableName' > fileName.txt -- hostname