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Questions tagged [percona-tools]

Percona Tools : Software Designed for Advanced MySQL/PerconaServer Tasks, Maintenance, and Monitoring

6
votes
2answers
598 views

COMMIT on top of the pt-query-digest output

I've been optimizing my MySQL server and after tweaking a few queries, I ended up with the COMMIT item on top of the pt-query-digest output, as shown in the extract below: # 322s user time, 770ms ...
6
votes
3answers
1k views

Finding differences between a master and slave when pt-table-sync fails

I have a table that's showing some differences on a master and slave according to pt-table-checksum (PTC). I've found some verifying differences beyond that. Certain tables in the mix have composite ...
5
votes
2answers
6k views

Which hot backup tools for MySQL InnoDB database : Percona XtraBackup, Zmanda Recovery Manager Enterprise or Community or…? [closed]

I manage a PHP/MySQL website : max 500 simultaneous users / average of 4000 per hour in update/read 1 MySQL Community Server (5.1) - (Xeon / 16 Go RAM) InnoDB Storage engine on 100 tables for 1.4 Go ...
4
votes
2answers
782 views

Is it possible to backup stored routines and functions with Innobackupex?

I am running a few restore tests on my Dev and I've noticed that the stored routines are not being restored with the innobackupx. Is that something achievable ? Am I doing something wrong ? I am only ...
4
votes
2answers
3k views

pt-table-checksum with slaves using non-standard ports

Trying to run pt-table-checksum to detect slave drift in MySQL replication. My slaves are not using the standard TCP listening port however, and so when I run the tool I get an error: Cannot connect ...
4
votes
1answer
3k views

Percona: Backup preparation doesn't work (“cannot open ./xtrabackup_logfile”)

I've created a MySQL backup with PerconaXtrabackup tool via (thanks to this guide): innobackupex --user=backupmysqluser --password=xyz --compress --stream=xbstream ./ > /var/backups/db/firstBackup....
4
votes
2answers
5k views

pt-table-checksum help required

I am trying to figure out pt-table-checksum, as I am using it for the first time. It look likes the documentation is complex and not easy to understand stuff. I have a complex replication topology ...
3
votes
3answers
1k views

Is it possible to pass parameters to pt-table-checksum using an options file?

We're using Percona's pt-table-checksum for MySQL replication integrity check. Is it possible to pass some or all of the options using some sort of configuration file? For instance, can we write the ...
3
votes
2answers
585 views

Is it possible to remove useless GRANTS in MySQL

I'm using pt-show-grants to create all my GRANTS on a new server but there's lots of old GRANTS that refer to tables that doesn't exist anymore so I get errors when I try to apply the SQL file on the ...
3
votes
1answer
7k views

Fixing tables out of sync as reported by pt-table-checksum, pt-table-sync is not working

I have several tables being reported by pt-table-checksum with CRC_DIFF between my master and slave servers using the following commands: $ pt-table-checksum h=master,u=user,p=password --empty-...
3
votes
1answer
298 views

pt-query-digest results are empty

I have a slow log generated by MySQL 5.1.71-log, that I've copied onto another machine. It appears I'm not getting any results from pt-query-digest. $> pt-query-digest slow.log # 2.1s user time, ...
3
votes
1answer
3k views

MySQL Handler_read_rnd_next == tablescans without indexes?

I am in the process of tuning our Percona 5.5 server, and have been using percona's tools to plot our database's performance. In the MySQL Handlers Plot, i have been noticing alot of "...
2
votes
3answers
170 views

Why pt-duplicate-key-checker suggests removing a composite index?

Here's a snippet from the output of the Percona Tool pt-duplicate-key-checker which searches for redundant indexes: # Key myidx ends with a prefix of the clustered index # Key definitions: # KEY `...
2
votes
3answers
656 views

“No database selected” or “Table 'DB.table' doesn't exist” failures in pt-upgrade run where queries from multiple DBs were collected with tcpdump

I collected queries on our Master using the following tcpdump command: tcpdump -i any -s 65535 -x -n -nn -q -tttt 'port 3306' > tcpdump.tcp The queries are executed amongst several databases. I ...
2
votes
3answers
1k views

xtrabackup prepare - after dump or before restore?

i have doubts about xtrabackup --apply-log. is there any difference when use it? should it be done right after dump or before restore (even few months later)? seems stupid, but maybe i missing ...
2
votes
2answers
2k views

any documentation on tpcc-mysql benchmark tool

Where can I find tpcc-mysql documentation? I google it but I can't find any documentation about it.
2
votes
2answers
2k views

Does pt-table-checksum point out rows that are different between Master and Slave?

Trying to verify replication integrity of my replica. And I found that pt-table-checksum is one of the best ways of doing it. I have a simple Master->Slave set up. Have created a sample table with 10 ...
2
votes
2answers
1k views

How pt-online-schema-change ensures consistency during data copy

I have read pt-online-schema-change documentation and understood that it works by creating triggers and copying data in chunks with in chunk-time seconds(0.5 seconds in default) Let us consider this ...
2
votes
1answer
823 views

Is there a non-blocking operation to back up MyISAM tables using Percona XtraBackup?

I've been reading through the website of Percona XtraBackup and it claims that: Percona XtraBackup can back up the following storage engines by briefly pausing writes at the end of the backup: ...
2
votes
1answer
2k views

Percona's xtrabackup --apply-log fails with “all log files must be created at the same time”

I'm trying to figure out why applying logs on my xtrabackup files isn't working. I created a VM running MySQL 5.5.24. Then I created the sakila test database and backed it up with the following ...
2
votes
1answer
785 views

Strange Locking issues while playing back logs via percona playback

Problem while replaying logs I am in the process of benchmarking a new DB node (specs at the end) and have run across some strange behavior: As described here i: Created a dump (innobackupex ftw) I ...
2
votes
1answer
2k views

pt-table-checksum - Diffs cannot be detected because no slaves were found (1)

I'm new to Percona tools. I am trying to use pt-table-checksum as follows: pt-table-checksum h=localhost -u root -p xyz--replicate=percona.checksums --create-replicate-table --databases=mysql But ...
2
votes
1answer
624 views

pt-table-sync error: Called not_in_left in state 0

I have setup a Mysql replication between 2 servers, using Percona Xtrabackup: Master is a MySQL 5.0.91 Community Edition (CentOS 4.8) Slave is a MySQL 5.1.68 Community Edition (CentOS 6.4) When ...
2
votes
1answer
789 views

Maatkit shows the MySQL replication error in one table, but won't fix it

We use MySQL 5.1 with a primary/secondary replication setup. I use mk-table-checksum from Maatkit to generate checksums on the master and perform consistency checks on the replica. mk-table-checksum ...
2
votes
1answer
1k views

Do I have to filter the percona.checksums table in replication for use with pt-table-checksum?

I've set up MySQL replication, one master and one slave. Now I just starting to check the data for integrity on both sides by using Percona's pt-table-checksum. Wonderful tool to detect any changes or ...
2
votes
1answer
612 views

pt-table-checksum and mysql 5.7 with binlog_format=ROW

How to use pt-table-checksum in mysql 5.7 where binlog_format=ROW is default I also need binlog_format=ROW to be set this way in relation to other parameters in the mysql configuration # pt-table-...
2
votes
2answers
180 views

pt-table-checksum not finding differences

I have a very simple setup: 1 master with 2 slaves. I stopped replication on one of the slaves (with the slave mysqld still running) and changed a row on the master. I have also kept all slaves and ...
2
votes
1answer
3k views

How much space is needed to reclaim space from a table in INNODB

I inherited a MySQL InnoDB table that has approximately 200 GB worth of data, as well as several unneeded indices that amount to approximately 500 GB. I've archived approximately 75 percent of the ...
2
votes
1answer
1k views

Running pt-table-checksum on a table in different databases

I'm using filters for replication: replicate-wild-do-table = test_slave.% replicate-rewrite-db = test->test_slave Is there an option to specify different DB name on slave for "pt-table-checksum" ...
2
votes
1answer
76 views

Alter a large mysql table 700 gb

The production table I want to alter is around 700 Gb. I want to remove a FK from that table. Mysql version is 5.1.61-log. I found following options: pt-online-schema-change: alters a table’s ...
2
votes
0answers
517 views

innobackupex: What causes Slave_open_temp_tables did not become zero after waiting 15 minutes?

As you might know, in order to assure a consistent replication state, the slave should be backup only when there are no open temporary tables: http://dev.mysql.com/doc/refman/5.5/en/replication-...
1
vote
2answers
120 views

Running pt-table-checksum with replicate-do-db option on

I've read the documentation on percona page, but still a bit confused, especially about the --replicate option. My setting is that the slave is only replicating certain databases from master, say db1 ...
1
vote
1answer
604 views

Problem with aborted PT-online-schema change command

I aborted a pt-online-schema change command to change a table definition. Now, when I run pt-online-schema change again, I get this error: The table <db name>.<table name> has triggers. ...
1
vote
2answers
55 views

MYSQL DATABASE BACKUP

Currently my backup strategy invloves :- 1)I have one master server and two slaves (Data approximately 700 GBs and tables are of mixed innodb and myisam). 2)I take weekly and monthly backup from ...
1
vote
1answer
956 views

Innobackupex: How to extract individual files from xbstream compressed backups

We are scripting a mix of full and incremental backup setup for our prodcut backend with sunday triggering full backup and incremental backup on all the remaining days. In this process, we should be ...
1
vote
1answer
939 views

Myloader command: Table doesn't exist

I took the backup of mysql database using mydumper command: mydumper -B mydb -o /backup/oct3 -s 500000 -c -m -S /tmp/mysql.sock -u root -p password@123 -v 3 Now, I am restoring mysql database ...
1
vote
1answer
400 views

xb_stream_read_chunk(): wrong chunk magic at offset 0x0

I have taken a backup of mysql instance like this innobackupex \ --user=$MYUSER \ --password=$MYPASS \ --no-timestamp \ --parallel=$DUMP_THREADS \ --stream=xbstream \ --slave-info \ ...
1
vote
1answer
152 views

PT-Kill not logging to file

Run command for pt-kill /usr/bin/pt-kill --ignore-state User lock --rds --match-command Query --victims all --match-user phppoint --daemonize --busy-time 10 --kill --print --log /var/log/pt-kill.log ...
1
vote
1answer
320 views

Using pt-table-checksum to compare a slave's DB to another slave

I understand that pt-table-checksum can do checksum compares between a master's DB and a slave's DB easily. However, let's say your master has two slaves replicating from it for the same DB, i.e. ...
1
vote
1answer
406 views

Is there a difference between an xtrabackup taken with and without --safe-slave-backup?

Currently I'm studying Percona's xtrabackup. In the manual in the paragraph "Taking Backups in Replication Environments" it says that using the --safe-slave-backup option is always recommended and I ...
1
vote
1answer
1k views

Native checksum table says there's a difference, pt-table-checksum does not

I was setting up a slave and doing some table checksums to check things were ok before getting them live. I did a native mysql checksum tables on the slaves after syncing slaving to a stopped point ...
1
vote
1answer
165 views

Why does pt-table-checksum gives exit status 0 if slave is unreachable?

I'm using pt-table-checksum version 2.1.4 for checking my master-slave set up. In the case when I forget to set up the right privileges on the slave, it writes an error to stderr like this: # pt-...
1
vote
1answer
402 views

pt-table-checksum from remote server

I am using pt-table-checksum for the first time and have some questions that I can't seem to resolve by reading the documentation on Percona's website. Per the documentation, pt-table-checksum ...
1
vote
0answers
180 views

why pt-table-checksum lock my whole table?

mysql> desc user_donate_request; +-------------------+--------------+------+-----+---------+-------+ | Field | Type | Null | Key | Default | Extra | +-------------------+--------...
1
vote
0answers
244 views

pt-online-schema-change with statement based replication in MYSQL

Is it possible/safe to use pt-online-schema-change in a Master slave environment where as the way replication is setup is statement based(SBR). What is the better way of doing it as currently I have ...
1
vote
0answers
117 views

pt-online-schema-change with circular replication

So I have an alter table (adding 4 columns) to do on a fairly large table (74 million rows). The problem is this table has firstly to remain online and writable during the whole operation and ...
1
vote
1answer
832 views

pt-table-sync for 3 master servers

We had a mysql multi master with 3 nodes and unfortunately the replication broke. We have some set of tables which has to be in sync with other database servers, so i was looking into Percona-Toolkit ...
1
vote
0answers
121 views

pt-table-checksum generates no output

I've been using pt-table-checksum on our staging server successfully, but when I run ./pt-table-checksum h=localhost,u=user --ask-pass --lock-wait-time=50 --databases prod It just sits there. No ...
0
votes
1answer
120 views

MariaDB defragmenting with new option innodb-defragment=1

I try to defragment table using innodb-defragment=1 https://mariadb.com/kb/en/library/defragmenting-innodb-tablespaces/ But it was a bad experience : - locks on table - no a good defragmentation ...
0
votes
1answer
337 views

Data drift on Row-Based-Replication

i've realized that one of my mysql slaves has missing rows. select count on specific table on master: 9605010 on slave: 9593831 slave is completely sync, no seconds_behind_master, no errors, no slow ...