zsh history is too short

When I run history in Bash, I get a load of results (1000+). However, when I run history the zsh shell I only get 15 results. This makes grepping history in zsh mostly useless. My .zshrc file contains the following lines:

HISTFILE=~/.zhistory
HISTSIZE=SAVEHIST=10000
setopt sharehistory
setopt extendedhistory

How can I fix zsh to make my shell history more useful?

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UPDATE

If in zsh I call history 1 I get all of my history, just as I do in Bash with history. I could alias the command to get the same result, but I wonder why does history behave differently in zsh and in Bash.

NVaughan (the OP) has already stated the answer in an update to the question: history behaves differently in bash than it does in zsh:

In short:

• zsh:
  • history lists only the 15 most recent history entries
  • history 1 lists all - see below.
• bash:
  • history lists all history entries.

Sadly, passing a numerical operand to history behaves differently, too:

• zsh:
• history <n> shows all entries starting with <n> - therefore, history 1 shows all entries.
• (history -<n> - note the - - shows the <n> most recent entries, so the default behavior is effectively history -15)
• bash:
• history <n> shows the <n> most recent entries.
• (bash's history doesn't support listing from an entry number; you can use fc -l <n>, but a specific entry <n> must exist, otherwise the command fails - see below.)

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Optional background info:

• In zsh, history is effectively (not actually) an alias for fc -l: see man zshbuiltins
  • For the many history-related features, see man zshall
• In bash, history is its own command whose syntax differs from fc -l
  • See: man bash
• Both bash and zsh support fc -l <fromNum> [<toNum>] to list a given range of history entries:
  • bash: specific entry <fromNum> must exist.
  • zsh: command succeeds as long as least 1 entry falls in the (explicit or implied) range.
  • Thus, fc -l 1 works in zsh to return all history entries, whereas in bash it generally won't, given that entry #1 typically no longer exists (but, as stated, you can use history without arguments to list all entries in bash).

#set history size
export HISTSIZE=10000
#save history after logout
export SAVEHIST=10000
#history file
export HISTFILE=~/.zhistory
#append into history file
setopt INC_APPEND_HISTORY
#save only one command if 2 common are same and consistent
setopt HIST_IGNORE_DUPS
#add timestamp for each entry
setopt EXTENDED_HISTORY   

this is my setting, and it work

Perhaps late however coming across this post and trying to apply it, and failed .... so in practical terms, put this in .zshrc :

alias history='history 1'

and you'll see anything until the HIST_SIZE runs out. To find a command I use (after the .zshrc change)

history | grep "my_grep_string"