How to speed up a large INSERT INTO SELECT in Postgres
I have a simple derived table query that I am trying to execute efficiently INSERT INTO derived table userid min date max date SELECT userid MIN service date as min date MAX service date AS max date FROM data table GROUP BY userid LIMIT 100000
Postgres insert query max length or number of VALUES parameters, The answer to your ion is that it depends on your system Eventually your client or server will run out of memory trying to process a huge statement typical unimpressive hardware can handle a million very skinny rows without trouble
PostgreSQL Documentation 16 INSERT
Outputs On successful completion an INSERT command returns a command tag of the form INSERT oid count The count is the number of rows inserted or updated oid is always 0 it used to be the OID assigned to the inserted row if count was exactly one and the target table was declared WITH OIDS and 0 otherwise but creating a table WITH OIDS is not supported anymore
Maximum row insert limit execute values Command Postgres, 1 Many rows you insert in PostgreSQL query If you re simply filtering the data and data fits in memory Postgres is capable of parsing roughly 5 10 million rows per second assuming some reasonable row size of say 100 bytes If you re aggregating then you re at about 1 2 million rows per second so if you insert multiple data in table use
PostgreSQL Documentation 16 Appendix K PostgreSQL Limits
PostgreSQL Documentation 16 Appendix K PostgreSQL Limits, Appendix K PostgreSQL Limits Appendix K PostgreSQL Limits Table K 1 describes various hard limits of PostgreSQL However practical limits such as performance limitations or available disk space may apply before absolute hard limits are reached Table K 1 PostgreSQL Limitations The maximum number of columns for a table is further
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PostgreSQL Documentation 16 VALUES
PostgreSQL Documentation 16 VALUES Expression A constant or expression to compute and insert at the indicated place in the resulting table set of rows In a VALUES list appearing at the top level of an INSERT an expression can be replaced by DEFAULT to indicate that the destination column s default value should be inserted DEFAULT cannot be used when VALUES appears in other contexts
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BEGIN SET TRANSACTION ISOLATION LEVEL SERIALIZABLE INSERT INTO mytable myvalue mykey SELECT randomvalue 1 WHERE SELECT COUNT FROM mytable WHERE mykey 1 5 END The transaction isolation level will ensure that transactions will only insert values if the count is less than 5 Share Postgres insert row only if row count is under a limit. 6 1 Inserting Data When a table is created it contains no data The first thing to do before a database can be of much use is to insert data Data is conceptually inserted one row at a time Of course you can also insert more than one row but there is no way to insert less than one row Even if you know only some column values a complete The PostgreSQL INSERT statement allows you to insert a new row into a table The following illustrates the most basic syntax of the INSERT statement INSERT INTO table name column1 column2 VALUES value1 value2 Code language SQL Structured Query Language sql In this syntax
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