Re: Per thread Connection memory

[Ankur Kaushik <ankurkaushik@xxxxxxxxx>]

I am Monitor per sec query count using below command

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while true; do (ps auxxx | grep postgres |wc -l); sleep 2; done

that around 390  

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Actually The database is Migrated from  Mysql to Postgresql

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Most queries found in processlist is which full the Java memory pool , Hibernate is used in Application

SELECT NULL AS TABLE_CAT, n.nspname AS TABLE_SCHEM, c.relnam

e AS TABLE_NAME,  CASE n.nspname ~ '^pg_' OR n.nspname = 'information_schema'  WHEN true THEN CASE  WHEN n.nspname = 'pg_catalog' OR n.nspname = 'information_schema' THEN CASE c.relkind   W

HEN 'r' THEN 'SYSTEM TABLE'   WHEN 'v' THEN 'SYSTEM VIEW'   WHEN 'i' THEN 'SYSTEM INDEX'   ELSE NULL   END  WHEN n.nspname = 'pg_toast' THEN CASE c.relkind   WHEN 'r' THEN 'SYSTEM TOAST TAB

LE'   WHEN 'i' THEN 'SYSTEM TOAST INDEX'   ELSE NULL   END  ELSE CASE c.relkind   WHEN 'r' THEN 'TEMPORARY TABLE'   WHEN 'i' THEN 'TEMPORARY INDEX'   WHEN 'S' THEN 'TEMPORARY SEQUENCE'   WH

EN 'v' THEN 'TEMPORARY VIEW'   ELSE NULL   END  END  WHEN false THEN CASE c.relkind  WHEN 'r' THEN 'TABLE'  WHEN 'i' THEN 'INDEX'  WHEN 'S' THEN 'SEQUENCE'  WHEN 'v' THEN 'VIEW'  WHEN 'c' T

HEN 'TYPE'  WHEN 'f' THEN 'FOREIGN TABLE'  WHEN 'm' THEN 'MATERIALIZED VIEW'  ELSE NULL  END  ELSE NULL  END  AS TABLE_TYPE, d.description AS REMARKS  FROM pg_catalog.pg_namespace n, pg_cat

alog.pg_class c  L

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Application Using Java Program , They have there java Pool system , when this Java pool memory full , tomcat need to restart in every 30- 60 min

Please Let me know in Postgresql  pgbouncer  is essential use for handling multithread applications ?

On Wed, Jan 27, 2016 at 3:53 PM, Wei Shan <weishan.ang@xxxxxxxxx> wrote:

Hi,

I'm not sure why do you need to restart tomcat? Could you explain further?

Also, max_connections=1000 is way too higher for 5GB of shared buffers. You could try setting it to 300 and put a connection pooler like pgbouncer infront

Thanks!

On 27 Jan 2016 15:29, "Ankur Kaushik" <ankurkaushik@xxxxxxxxx> wrote:

Hi ,

For 16 GB Ram 8 core CPU , My Postgresql configuration are as below

listen_addresses = '*'                  # what IP address(es) to listen on;

max_connections = 1000                  # (change requires restart)

shared_buffers = 5GB                    # min 128kB

dynamic_shared_memory_type = posix      # the default is the first option

effective_cache_size = 4GB

log_destination = 'stderr'              # Valid values are combinations of

logging_collector = on                  # Enable capturing of stderr and csvlog

log_directory = 'pg_log'                # directory where log files are written,

log_filename = 'postgresql-%a.log'      # log file name pattern,

log_truncate_on_rotation = on           # If on, an existing log file with the

log_rotation_age = 1d                   # Automatic rotation of logfiles will

log_rotation_size = 0                   # Automatic rotation of logfiles will

log_min_duration_statement = 100        # -1 is disabled, 0 logs all statements

log_line_prefix = '< %m >'                      # special values:

log_timezone = 'Asia/Kolkata'

datestyle = 'iso, mdy'

timezone = 'Asia/Kolkata'

lc_messages = 'en_US.UTF-8'                     # locale for system error message

lc_monetary = 'en_US.UTF-8'                     # locale for monetary formatting

lc_numeric = 'en_US.UTF-8'                      # locale for number formatting

lc_time = 'en_US.UTF-8'                         # locale for time formatting

default_text_search_config = 'pg_catalog.english'

I Am Monitoring the Connection for postgresql

while true; do (ps auxxx | grep postgres |wc -l); sleep 2; done

Per sec as connection grows near to 180 , Need to restart Tomcat .

Is PostgreSQL Take per thread Memory to0 High  to assign