select userid::regrole, dbid, query from pg_stat_statements order by stddev_time desc limit 10; 【最耗共享内存的SQL】 执行如下命令,查询最耗共享内存 SQL。 select userid::regrole, dbid, query from pg_stat_statements order by (shared_blks_hit+shared_blks_dirtied) desc limit 10; 【最耗...
8、oracle层级关系学习 select level dep,CONNECT_BY_ISLEAF LEAF_FLAG,SYS_CONNECT_BY_PATH(depname, ' - ') name_path from DEP_tcl start with upperdepid is null connect by nocycle prior depid=upperdepid level对应第几层;CONNECT_BY_ISLEAF是否是叶子;connect_by_root显示根目录;SYS_CONNECT_BY_PAT...
Applications should handle normal queries with a higher level library and only use pgconn directly when required for low-level access to PostgreSQL functionality. Example Usage pgConn, err := pgconn.Connect(context.Background(), os.Getenv("DATABASE_URL")) if err != nil { log.Fatalln("pg...
ssl_usedrequiressslinfoextension, andbuffercache_usage/buffercache_usagequeries needpg_buffercache. You can enable them all by running: RailsPgExtras.add_extensions By default a primary ActiveRecord database connection is used for running metadata queries, rake tasks and web UI. To connect to a d...
38.level关键字 select regexp_substr('zhangsan,lisi,wangwu','[^,]+',1,level),level from dual connect by <=length(translate('zhangsan,lisi,wangwu',','||'zhangsan,lisi,wangwu',','))+1 1. 切开目标字符串并将切开的字符串按列输出
wal_level = replica --10以后的版本为replica 物理复制,有一定局限性,可以选择逻辑复制logical max_wal_senders=10 --流复制允许连接进程,主备库这个参数值必须一样 wal_keep_segments =64 archive_mode = on -- 设置归档模式 archive_command = 'cp %p /home/postgres/arch/%f' --设置归档cp命令 ...
cat >> /postgresql/pgdata/postgresql.conf <<'EOF'# 归档参数wal_level='replica' archive_mode='on' archive_command='test ! -f /pgpostgresql/archive/%f && cp %p /postgresql/archive/%f' restore_command='cp /postgresql/archive/%f %p'# 主从流复制hot_standby=on ...
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STV_DB_ISOLATION_LEVEL STV_EXEC_STATE STV_INFLIGHT STV_LOAD_STATE STV_LOCKS STV_ML_MODEL_INFO STV_MV_DEPS STV_MV_INFO STV_NODE_STORAGE_CAPACITY STV_PARTITIONS STV_QUERY_METRICS STV_RECENTS STV_SESSIONS STV_SLICES STV_STARTUP_RECOVERY_STATE STV_TBL_PERM STV_TBL_TRANS STV_WLM_CLASSIFICATION...
cat>$ORACLE_HOME/hs/admin/initPG_LINK.ora<<"EOF"HS_FDS_CONNECT_INFO=PG_LINKHS_FDS_TRACE_LEVEL=255HS_FDS_SHAREABLE_NAME=/usr/pgsql-12/lib/psqlodbcw.soHS_NLS_NCHAR=UCS2HS_LANGUAGE=AMERICAN_AMERICA.AL32UTF8setODBCINI=/home/oracle/.odbc.iniEOF ...