vertica database

Tags: dba run too cut OCA tle source load optimizedThe DBD = Database Designer is the primary native tool in the optimization of Vertica databases. First run the AdminTools tool and follow the steps below: 1. Select "6 Configuration Menu"2. Select "2 Run Database Designer"3. "Select a database for design"Select the

Requirements: Build a table on the Vertica database, the table structure originates from the original Oracle database, so it needs to be converted into Vertica database table structure. The actual conversion operation needs to evaluate all the data types used by the source l

Original link: Vertica "error:too many ROS containers exist" Recently in the Vertica with a problem, vertica after running for some time, always appear similar to the following error Java.sql.SQLException: [Vertica][vjdbc] (5065) error:too Many ROS containers exist for the following projections: ;p rojection> (limit

When using Vertica, you often encounter the need to forcibly end or interrupt a time-consuming query. In this case, you can use the INTERRUPT_STATEMENT () provided by Vertica () INTERRUPT_STATEMENT requires two parameters. The first parameter is session_id, and the second parameter is statement_id. When using Vertica, you often encounter the need to forcibly end

Address: http://blog.csdn.net/kongxx/article/details/7176961 During a recent stress test on vertica, we found that the following exception occurs when the number of concurrent requests reaches 50 +. Com. vertica. util. psqlexception: Fatal: new session rejected due to limit, already 55 sessions active This problem occurs because the maxclientsessions parameter is specified in

Tags: group_concat mysql vertica expansion packToday, when customers are using Vertica, they want to use the Group_concat () function of MySQL.The Group_concat function returns a string result that is composed of concatenated values in the grouping. Since this function is not in the Vertica. So you need to develop it yourself. Fortunately, someone has already wri

In the use of Vertica often encountered in the execution of a time-consuming query when you want to forcibly end or interrupt this operation, at this time can be provided by the Vertica interrupt_statement () function to solve such problems, interrupt_ Statement requires two parameters, the first parameter is session_id, and the second parameter is statement_id, both of which can be obtained from the sessio

This article address: http://blog.csdn.net/kongxx/article/details/7176961 A recent stress test on Vertica found that the following exception occurred when the number of concurrent requests reached 50 + Com.vertica.util.PSQLException:FATAL:New session rejected due to limit, already-sessions active at Com.vertica.core. V3. Connectionfactoryimpl.readstartupmessages (Unknown Source) at Com.vertica.core.v3.ConnectionFactoryImpl.openConnectionImpl (Unknown

Use Vertica to construct a calendar:SELECT to_number (TO_CHAR (ts: DATE, 'yyyymmdd') as day_id,Year (ts: DATE) as year_of_calendar,Month (ts: DATE) as month_of_year,Dayofweek (ts: DATE) as day_of_weekFROM (SELECT '01-01-2013 ': TIMESTAMP as tmUNIONSELECT '12-31-2500 ': TIMESTAMP as tm) As tTIMESERIES ts as '1 Day' OVER (order by tm );Create a calendar in Oracle:Select to_date ('123', 'yyyymmdd') + (level-1) as day_id,EXTRACT (year from (to_date ('2014

The table structure is as follows: CREATETABLEIFNOTEXISTSpublic. user (idPRIMARYKEY, namevarchar (32) NOTNULLUNIQUE ,......); modify statement altertablepublic. useralternamesetdatatypevarchar (52); due to the constraints of the "UNIQUE" condition,

Three words: strong, big, comprehensive, and strongly recommended SQL statement Query Result select (timestamp '2005-01-17 10:00' - timestamp '2005-01-01'); 16 10:10 select (timestamp '2005-01-17 10:00' -

RHEL 6.2 CPU 24 memory 128G 8 Node 1. Keep more Event Logs for dc_tuple_mover_events. select SET_DATA_COLLECTOR_POLICY(‘TupleMoverEvents‘, ‘1000‘, ‘100000‘); Default: 1000kb kept in memory, then kb kept on disk. 2. Keep more Event Logs for

# Example: migrate Weibo user data. Because the structure of the source table weiboFriend is not exactly the same as that of the target table weiboUser, the statement must not only strictly arrange the field order, but also use the default (for

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This article address: http://blog.csdn.net/kongxx/article/details/6656658 Today upgraded Vertica from 4.0.x to 5.0.4 version, found vertica4x multiple database instance port configuration The method mentioned in the article is no longer applicable, do some research findings can be achieved through the following steps: 1. First stop all the database instances;

requirements: high concurrency and read-write requirements for databases, Efficient storage and access to massive amounts of data , High scalability and high availability of the database. A sentence is not suitable for distributed, high concurrency, and mass .2. Column Storage Sybase IQ, C-Store, vertica,hbaseDefinition: What is a column database