Last_SQL_Error: Could not execute Update_rows event on table test.tab Can't find record in 'tab', Error_code: 1032 handler error HA_ERR_KEY_NOT_FOUND the event's master log binlog.000021, end_log_pos 970 Last_SQL_Errno: 1062 How do you Detect Them?Īs usual, SHOW SLAVE STATUS will help us identify the problem. Those which could cause data drift will use “row” format. Still it is the recommended way of running MySQL replication.įinally, the third one, “mixed”, works in a way that those events which are safe to write in the form of statements use “statement” format. As a result, this format is great for slave consistency but, as you can imagine, it’s very vulnerable when it comes to data drift. As you can see, there’s not much room for interpretation – it’s precisely defined which row is used and how it’s changed. We set first column to 2 (value doesn’t change) and second column to 4. # means that we are updating a row in ‘tab’ table in ‘test’ schema where first column has a value of 2 and second column has a value of 5. For example, an event may look like below: # UPDATE `test`.`tab` ![]() Second format, “row”, stores the query result instead of query statement. This setting has the highest tolerance on slave drift but it’s also the one which cannot guarantee slave consistency – it’s hard to recommend to use it in production. First, “statement”, means that SQL is written in plain text, just as it has been executed on a master. In short, there are three ways in which MySQL stores binary log events. How often this problem shows up depends mostly on your replication settings. For example, a row which existed on the master does not exist on a slave and it cannot be deleted or updated. Main reason is slave drift – something (usually errant transactions but also other issues or bugs in the replication) causes the slave to differ from its master. This is something which should not happen, yet it happens very often – a situation in which an SQL statement executed on the master succeeds but the same statement executed on one of slaves fails. ![]() In this post, we will have a look at some more issues that you might see when dealing with MySQL replication. We also looked at some of the typical problems. I suspect we only see this for unanswered calls because once answered the other ringing extensions drop off and thus there is no duplication.In the previous post, we discussed how to verify that MySQL Replication is in good shape. My question is this expected operation because CDR is trying to report three separate calls all with the same details? or does CDR need further development to handle anomaly’s of this kind? WARNING: res_odbc.c:654 ast_odbc_prepare_and_execute: SQL Execute returned an error -1: 23000: Duplicate entry ‘1423420466.5’ for key ‘uniqueid’ (88) NOTICE: res_odbc.c:1568 odbc_obj_connect: res_odbc: Connected to asterisk-odbc NOTICE: res_odbc.c:1536 odbc_obj_connect: Connecting asterisk-odbc WARNING: res_odbc.c:770 ast_odbc_sanity_check: Connection is down attempting to reconnect… ![]() WARNING: res_odbc.c:666 ast_odbc_prepare_and_execute: SQL Execute error -1! Verifying connection to asterisk-odbc … This works as expected but it produces a lot of errors relating to CDR. I’m using the following in the dialplan to call multiple extensions at the same time.Įxten => s,n,Dial(SIP/2580&SIP/2581&SIP/2582,60,rt)
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