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Last entries

    20240418.1515

  1. postgres|postgresql > must be owner of type - [s]

    SELECT typname, typowner::regrole, n.* FROM pg_type t LEFT JOIN pg_namespace n on t.typnamespace = n.oid

    2. 20240418.1121

  2. postgres > how to find which records or tables are locked on Postgresql - [s]

    select pid, usename, pg_blocking_pids(pid) as blocked_by, query as blocked_query from pg_stat_activity where cardinality(pg_blocking_pids(pid)) > 0;

    3. 20240418.0849

  3. postgres - VACUUM FREEZE vs. VACUUM FULL - [s]

    4. 20240411.1501

  4. linux|centos7 > yum install createrepo - [s]

    [root@node-nxrm2 yum.repos.d]# cat appstream.repo [appstream] name=CentOS Linux $releasever - AppStream #mirrorlist=http://#mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=AppStream&infra=$infra #baseurl=http://vault.centos.org/$contentdir/$releasever/AppStream/$basearch/os/ baseurl=http://vault.centos.org/centos/7.6.1810/os/x86_64/ gpgcheck=1 enabled=1 gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-centosofficial

    5. 20240411.1450

  5. linux|CentOS > Cannot prepare internal mirrorlist: No URLs in mirrorlist - [s]

    sed -i 's/mirrorlist/#mirrorlist/g' /etc/yum.repos.d/CentOS-Linux-* sed -i 's|#baseurl=http://mirror.centos.org|baseurl=http://vault.centos.org|g' /etc/yum.repos.d/CentOS-Linux-*

    6. 20240405.1104

  6. bash|wget > How To Find Broken Links (404: Not Found.) - [s]

    wget --spider -r -nd -nv -l3 -w1 -t1 -e robots=off -o help.example.com.log https://help.example.com/en/

    7. 20240325.0952

  7. java|visualvm > BTrace : Troubleshooting tool for Java applications - [s]

    8. 20240325.0948

  8. java > VisualVM: Plugin Buffer Monitor - [s]

    9. 20240325.0917

  9. Fixing Java's ByteBuffer native memory "leak" (evanjones.ca) - [s]

    10. 20240325.0912

  10. java > Troubleshooting Problems With Native (Off-Heap|non-heap) - [s]

    -XX:MaxDirectMemorySize vs. -Djdk.nio.maxCachedBufferSize java.lang.OutOfMemoryError: null at java.base/jdk.internal.misc.Unsafe.allocateMemory(Unsafe.java:616) at java.base/java.nio.DirectByteBuffer.(DirectByteBuffer.java:122) at java.base/java.nio.ByteBuffer.allocateDirect(ByteBuffer.java:317) at java.base/sun.nio.ch.Util.getTemporaryDirectBuffer(Util.java:242) at java.base/sun.nio.ch.IOUtil.read(IOUtil.java:242) at java.base/sun.nio.ch.FileChannelImpl.read(FileChannelImpl.java:223) at java.base/sun.nio.ch.ChannelInputStream.read(ChannelInputStream.java:65) at java.base/sun.nio.ch.ChannelInputStream.read(ChannelInputStream.java:107) at java.base/sun.nio.ch.ChannelInputStream.read(ChannelInputStream.java:101) at java.base/java.nio.file.Files.read(Files.java:3159) at java.base/java.nio.file.Files.readAllBytes(Files.java:3213)

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